2022 Annual OIB Monitoring Report 06/28/2023

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL MONITORING
REPORT
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PREPARED FOR:
TOWN OF OCEAN ISLE BEACH
PREPARED BY:
COASTAL
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COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC.
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EXECUTIVE SUMMARY
In April 2022, the Town of Ocean Isle Beach's Shoreline Protection Project entailing the
construction of a terminal groin and associated accretion fillet along the eastern end of the island
was completed. Following completion of the project, the Town's Shoreline and Inlet Management
Plan (Plan) was initiated to monitor the performance of the project. The utility of the Plan was
designed to provide a baseline for assessing recent and future adverse impacts, and to determine
where any established thresholds become breached which could lead to the need to implement
mitigative action.
The terminal groin component of the project consisted of a 750-foot rubblemound structure and a
300-ft shore anchorage section (to protect against flanking of the landward end of the structure).
As required by permit, an accretion fillet was also constructed along a 3,214-foot section of
oceanfront shoreline immediately west of the structure in conjunction with the Federal Coastal
Storm Risk Management (CSRM) project which involved the placement of beach fill to Goldsboro
St. (Sta. 80+00). The beach fill for the accretion fillet and the CSRM project was obtained from
the federally authorized and permitted borrow area within Shallotte Inlet. The volume quantities
provided by the USACE indicated that 272,936 cubic yards (cy) of beach fill was placed within
the footprint of the accretion fillet and an additional 484,211 cy of beach fill was placed to
construct the federal CSRM project.
The Plan includes the acquisition of beach profile survey data covering 27,000 feet of shoreline on
Ocean Isle Beach (0+00 to 270+00) and 10,000 feet of shoreline on the west end of Holden Beach
(300+00 to 400+00), radial profiles around the east (403+00 to 425+00) and west shoulders (-5+00
to-35+00) of Shallotte Inlet, hydrographic survey of the inlet, and the acquisition of aerial imagery
of the inlet area. The beach profiles, which are spaced at 500-foot intervals, are surveyed every
six months (fall and spring) while the inlet radial profiles are surveyed once each year during the
spring. The aerial imagery are also acquired once each year during the spring. Beach profile
monitoring surveys were conducted by McKim & Creed in June 2022 and December 2022 and
were used in this assessment to quantify the initial monitoring shoreline and volumetric changes
and rates. Survey data collected in June 2022 serves as a baseline for long-term comparisons in
the future. The initial changes were determined by comparing the survey data collected in June
2022 and December 2022. Throughout this report, this period will be referred to as the "recent"
monitoring periods in the report. The June 2022 hydrographic survey data collected by McKim &
Creed from within Shallotte Inlet was used to document the post -construction condition of the
borrow area, ebb shoal configuration, and the main channel location. Aerial imagery collected by
GeoNXS Solutions in June 2022 was utilized to map the sand spit shoreline on the east and west
shoulders of Shallotte Inlet so that changes in the spit shoreline can be compared.
The first annual monitoring cycle to monitor the shoreline / inlet changes at Ocean Isle Beach and
Holden Beach following the construction of the Ocean Isle Beach Shoreline Protection Project
(terminal groin and accretion fillet) and the 2022 federal CSRM project has been completed. The
data was used to evaluate linear shoreline and volumetric changes and assess the impact of the
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE i

Shoreline Protection Project using established thresholds to monitor the response of the shorelines
along the entirety of Ocean Isle Beach's oceanfront shoreline and the western 10,000 feet of
Holden Beach's oceanfront shoreline as well as the inlet shorelines on the east and west shoulders
of Shallotte Inlet. Results of the 2022 annual monitoring have been discussed in terms of recent
short-term changes that occurred relative to the new June 2022 baseline survey.
Overall, the 2022 initial monitoring results of the Ocean Isle Beach linear shoreline and volumetric
change analyses show that the East Beach segment experienced the most erosion during the 6-
month monitoring period. The West End and West Beach segments also experienced a trend of
erosion during the 6-month monitoring period. The Central Beach segment experienced variable
conditions but overall indicated net accretion; however, there was a reversal in the trend in the
vicinity of the pier located between Stations 140+00 and 145+00. Initial post -construction linear
shoreline and volumetric changes analyzed along the oceanfront beach at Holden Beach indicate
the area experienced a net accretion during the initial 6-month monitoring period.
The shoreline threshold monitoring results along the Ocean Isle Beach oceanfront shoreline
indicate that the initial post -construction shoreline change rates exceeded the established shoreline
change threshold for 11 of the 53 stations monitored. The June 2022 wet/dry inlet shoreline,
digitized from the June 2022 aerial image also depicted two locations along the inlet shoreline
where the established threshold was exceeded: one along the interior inlet shoreline of Ocean Isle
Beach adjacent to the Atlantic Intracoastal Waterway (AIWW) and the other along —1,000 ft of
the inlet shoreline east of the terminal groin structure between Stations -5+00 and-15+00. The
inlet shoreline east of the structure, where the threshold was exceeded, has demonstrated a trend
of erosion since before the construction of the Shoreline Protection Project; however, this section
of shoreline was less eroded in March 1999 prior to construction of the initial 2001 federal CSRM
project. Following completion of the Shoreline Protection Project and the 2022 federal CSRM
project, sand has been observed bypassing the terminal groin and being deposited in the area
immediately east of the structure. Continued equilibration as well as the shoreline stabilizing from
the effects of the of the beach fill projects that placed approximately 757,000 cubic yards of sand
along the eastern 8,000 ft. of Ocean Isle Beach and the associated longshore sediment transport of
sand to the west is expected to moderate future erosion in these areas. Along the western portion
of Ocean Isle Beach (west of the pier), future changes are expected to moderate as the beach
continues to recover from the impacts sustained from Hurricane Ian in late September 2022.
On Holden Beach, the initial post -construction shoreline changes along the oceanfront area
indicated accretion at 18 of the 21 monitoring stations. In addition, the shoreline change rate
threshold analysis showed that the established pre -construction threshold was not exceeded at any
station. Similarly, the analysis of aerial imagery showed the June 2022 wet/dry line representing
Holden Beach's inlet shoreline did not exceed the established inlet shoreline threshold. The
continuation of monitoring these areas on Ocean Isle Beach and Holden Beach will help to
establish more representative long-term post -construction shoreline change rates.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE ii

The areas where the post -construction oceanfront and inlet shoreline changes exceeded the
thresholds on Ocean Isle Beach will be monitored over the 2-year confirmation period. The Plan
includes the establishment of a 2-year confirmation period to account for possible short-term
shoreline changes that could be caused by storm events or other factors. If during the confirmation
period the oceanfront and inlet shoreline changes where the thresholds have been breached no
longer exceed the thresholds, the 2-year confirmation period will be reset. If the shoreline changes
continue to exceed the thresholds over the entire 2-year confirmation period, an assessment of the
proper responsive measures will be made through coordination with State and Federal regulatory
officials.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE iii

TABLE OF CONTENTS
EXECUTIVE SUMMARY........................................................................................................... i
INTRODUCTION........................................................................................................................ 1
PROJECT DESCRIPTION......................................................................................................... 2
MONITORINGPLAN................................................................................................................. 3
NotableEvents............................................................................................................................
8
Method for Determining Shoreline Changes.............................................................................. 9
Method for Determining Volumetric Changes........................................................................... 9
Establishment of Shoreline and Inlet Shoreline Thresholds....................................................... 9
RESULTS& ANALYSIS...........................................................................................................
14
MHW Shoreline Change Analysis............................................................................................
14
VolumeChange Analysis.........................................................................................................
18
PROJECT IMPACTS / PERFORMANCE TO DATE...........................................................
21
Shoreline Change Threshold Analysis......................................................................................
21
Inlet Shoreline Threshold Analysis...........................................................................................
26
Hydrographic Survey of Shallotte Inlet....................................................................................
31
CONCLUSION/FINDINGS.......................................................................................................
33
LIST OF FIGURES
Figure 1.
Project Location Map..................................................................................................... 1
Figure 2.
Map showing Shoreline Protection Project and the Federal CSRM Project Limits.......
2
Figure 3.
Ocean Isle Beach and Holden Beach Annual Monitoring Beach Profiles .....................
3
Figure 4.
Shallotte Inlet Shoreline Monitoring Radial Profiles .....................................................
4
Figure 5.
Ocean Isle Beach Shoreline Monitoring Segments........................................................
6
Figure 6.
Holden Beach Shoreline Monitoring Segments.............................................................
7
Figure 7.
95% Confidence Intervals for Ocean Isle Beach Monitoring Stations .........................
11
Figure 8.
95% Confidence Intervals for Holden Beach Monitoring Stations ..............................
12
Figure 9.
Shallotte Inlet Shoreline Thresholds............................................................................
13
Figure 10.
Ocean Isle Beach MHW Shoreline Change since June 2022.....................................
16
Figure 11.
Holden Beach MHW Shoreline Change since June 2022..........................................
17
Figure 12.
Ocean Isle Beach Annualized Volume Change Rates above -18 ft. NAVD88..........
19
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE iv

Figure 13.
Holden Beach Annualized Volume Change Rates above -18 ft. NAVD88...............
21
Figure 14.
Shoreline Change Rates on Ocean Isle Beach............................................................
24
Figure 15.
Shoreline Change Rates on Holden Beach.................................................................
26
Figure 16.
Shallotte Inlet Shoreline Change Plot.........................................................................
27
Figure 17.
Holden Beach Inlet Shoreline Change (in Feet).........................................................
28
Figure 18.
Ocean Isle Beach Inlet Shoreline Change (in Feet) ....................................................
29
Figure 19.
Sediment Bypassing the Terminal Groin (May 26t', 2022).......................................
30
Figure 20.
June 2022 Shallotte Inlet Hydrographic Survey Elevation Map ................................
32
LIST OF TABLES
Table1.
Survey Events to Date...................................................................................................... 5
Table 2.
Ocean Isle Beach Monitoring Segments.......................................................................... 6
Table 3.
Holden Beach Monitoring Segments............................................................................... 7
Table 4.
Recent Notable Events.....................................................................................................
8
Table 5.
Summary of OIB MHW Shoreline Changes.................................................................
14
Table 6.
Summary of Holden Beach MHW Shoreline Changes .................................................
17
Table 7.
Ocean Isle Beach Volumetric Changes Above -18 ft. NAVD88..................................
18
Table 8.
Holden Beach Volumetric Changes above -18 ft. NAVD88.........................................
20
Table 9.
Shoreline Change Rate (FT/YR) Threshold Comparison ..............................................
22
APPENDICES
APPENDIX A: Comparative Beach Profile Plots for Ocean Isle Beach Monitoring Stations
APPENDIX B: Comparative Beach Profile Plots for Holden Beach Monitoring Stations
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
INTRODUCTION
This report is the first in a series of annual reports that describes the results of monitoring initiatives
that have been set forth to study the effects of the Shoreline Protection Project which was
constructed on the east end of Ocean Isle Beach between November 2021 through April 2022. The
goal of the Plan is to:
1) Monitor the Ocean Isle Beach and Holden Beach oceanfront shorelines and east and west
shoulders of Shallotte Inlet to verify the anticipated response of the shorelines and inlet
shoulders to the effects of the Shoreline Protection Project (which included the construction
of a terminal groin and accretion fillet) and,
2) Provide data to track the performance of the Shoreline Protection Project to assess any
potential impacts as a result of the project on the adjacent shorelines.
Condition #20 within the Town's CAMA Major Permit No. 107-16 and Special Condition #34
within the Town's Dept. of Army Individual Permit No. SAW-2011-01241 require the Town to
conduct post -construction monitoring along the entirety of Ocean Isle Beach's oceanfront
shoreline and the western end of Holden Beach as defined in the Shoreline and Inlet Management
Plan included within the Town's Final Environmental Impact Statement (FEIS) dated February
23, 2016. The Plan also includes post -construction monitoring within Shallotte Inlet and the
shorelines surrounding the inlet.
The Town of Ocean Isle Beach is located on a coastal barrier island, approximately 29,200 feet
(5.5 miles) long, along the Atlantic Ocean on the coastline of Brunswick County in southeastern
North Carolina (Figure 1).
Figure 1. Project Location Map.
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Ocean Isle Beach is oriented generally in an east/west direction, with a south facing beach. The
island is separated from Holden Beach on the eastern tip by Shallotte Inlet and from Sunset Beach
on the western terminus by Tubbs Inlet. Barrier islands such as Ocean Isle Beach are dynamic
systems that erode and accrete depending on various factors such as storms, sea level rise, their
underlying geology, and shoreline stabilization efforts.
PROJECT DESCRIPTION
The Ocean Isle Beach Shoreline Protection Project was constructed between November 2021 and
April 2022. The construction of the Shoreline Protection Project consisted of two components: a
terminal groin and an accretion fillet. The construction of the 1,050 ft. terminal groin component
of the project consisted of a 750-foot rubblemound structure and a 300-ft shore anchorage section
(to protect against flanking of the landward end of the structure). As required by permit, an
accretion fillet was also constructed along a 3,214-foot section of oceanfront shoreline
immediately west of the structure in conjunction with the construction of the Federal Coastal Storm
Risk Management (CSRM) project for the Town of Ocean Isle Beach. The beach fill for the
accretion fillet and the CSRM project was obtained from the permitted borrow area within
Shallotte Inlet. Volume quantities provided by the USACE indicated that approximately 757,000
cubic yards of beach fill was placed to construct both the accretion fillet and the CSRM project
(Sta. 0+00 to 80+00). Figure 2 depicts the limits of the Ocean Isle Beach Shoreline Protection
Project and the federal CSRM project.
Figure 2. Map showing Shoreline Protection Project and the Federal CSRM Project Limits.
■
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
MONITORING PLAN
The Town of Ocean Isle Beach's Shoreline and Inlet Management Plan (Plan) includes the
acquisition of beach profile survey data covering 27,000 feet of shoreline on Ocean Isle Beach and
10,000 feet of shoreline on the west end of Holden Beach (Figure 3), inlet radial profiles around
the east and west shoulders of Shallotte Inlet (Figure 4), hydrographic survey of the inlet, and the
acquisition of aerial imagery. Beach profile surveys, which are spaced at 500-foot intervals along
the beach from the USACE baseline to a distance of at least 2,500 ft. offshore or to a depth of
approximately -30 ft. NAVD88, are generally performed every six months; once in the fall and
once in the spring. The inlet radial profiles and the hydrographic survey of Shallotte inlet and
shoals are conducted each spring. The surveys are supplemented with annual aerial imagery of
the inlet area and the project area that is flown to correspond with the spring survey work.
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Notes: Legend:
1. Coordinates are in feet based on the North Carolina Ocean Isle Beach Monitoring Profiles
State Plane Coordinate System, North American Holden Beach Monitoring Profiles
Datum of 1983 (NAD 83).
2. Background imagery collected on 2020-08-04 by NOAA
and on 2022-05-26 by CPE.
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Figure 3. Ocean Isle Beach and Holden Beach Annual Monitoring Beach Profiles.
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Figure 4. Shallotte Inlet Shoreline Monitoring Radial Profiles.
The assessment of the beaches is performed by analyzing the beach profile survey data to
determine the recent and long-term shoreline and volumetric changes as well as any
erosional/accretional trends or patterns between the surveys. Because this report includes the
results from the first monitoring event since the construction of the Shoreline Protection Project
there is insufficient data to determine long-term trends. Monitoring surveys used in the analysis
described in this report were conducted by McKim & Creed in June 2022 and December 2022.
Survey data collected in June 2022 serves as a baseline for comparison with subsequent survey
datasets to assess the long-term changes. Recent changes were analyzed based on a comparison
of the June 2022 and December 2022 surveys. Appendix A provides comparative cross -sections
of the June 2022 and December 2022 monitoring survey profiles. These profiles are predominately
used to depict changes in the subaerial berm and nearshore area and provide information on the
entire beach cross-section to its point of closure. Table 1 provides a summary of the survey events
to date.
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
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Table 1. Survev Events to Date
SHORELINE SEGMENTS
STATIONS
June 2022 (Baseline)
-35+00 to 270+00 (OIB) and 300+00 to 425+00 (HB)
December 2022
0+00 to 270+00 (OIB) and 300+00 to 400+00 (HB)
In addition to the spring and fall beach profile monitoring surveys, the Plan also includes a
hydrographic survey of Shallotte Inlet each spring and the acquisition of high -resolution aerial
images taken each spring to help delineate the extent of the sand spit shoreline on the east and west
shoulders of Shallotte Inlet such that changes in the spit shoreline can be compared over time. The
hydrographic survey limits cover the area within the inlet from approximately station 400+00 on
Holden Beach to station 0+00 on Ocean Isle Beach and from the confluence of the inlet with the
AIWW seaward to the -30-foot NAVD88 depth contour in the ocean.
Performance of the Ocean Isle Beach and Holden Beach shorelines was determined based on an
analysis of volumetric changes and linear shoreline changes. Volumetric change was measured at
each monitoring station from the baseline seaward to a depth of -18 ft. NAVD88. Linear shoreline
change was measured at each station based on the position of the mean high water (MHW) (+1.8
ft. NAVD88). Only those profiles surveyed at the monitoring stations (every 500 ft.), except for
the inlet radial profiles, were incorporated in the linear shoreline and volumetric analyses.
In addition to the linear shoreline change and volumetric change analyses, shoreline change
thresholds for the Ocean Isle Beach and Holden Beach ocean -facing shorelines and inlet shoreline
thresholds for the east and west shoulders of Shallotte Inlet were established. The thresholds were
developed to assess whether any observed shoreline changes would not have been expected to
occur under pre -project conditions and could be attributed to the construction of the Shoreline
Protection Project. Further details regarding these analyses are discussed in the following sections.
The Ocean Isle Beach monitoring area is subdivided into five (5) segments based on volumetric
and shoreline changes to capture spatial variations in the behavior of the project. Beginning at the
eastern limits of Ocean Isle Beach, the first shoreline segment is referenced as "OIB Inlet"
shoreline. This area is located along the Shallotte Inlet western shoreline and is represented by
profiles located between Stations -35+00 (near the end of the spit) through -5+00 (just east of the
terminal groin). The shoreline within this segment is presently designated as an Inlet Hazard Area
(IHA) and was excluded from the shoreline change and volumetric analysis due to the
variable/erratic nature of the changes within the IHA. This area will be evaluated each spring
based on an inlet shoreline threshold established within the Plan. The next shoreline segment,
designated as "East Beach", includes an approximate 8,000 ft. long extent of oceanfront shoreline
along the easternmost developed portion of Ocean Isle Beach between Stations 0+00 (adjacent to
the terminal groin) and 80+00 (Goldsboro Street). The shoreline within this segment encompasses
the terminal groin accretion fillet (Sta. 0+00 to Sta. 30+00) as well as the 2022 federal CSRM
project that terminated at Sta. 80+00. The next shoreline segment is referenced as the "Central
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Beach" and extends approximately 9,000 ft. between Stations 80+00 to 170+00 (Sea Turtle Path).
This shoreline segment is also part of the extent of the template for the federal CSRM project;
however, this portion of the federal CSRM project has not required maintenance since the project
was initially constructed in 2001. The shoreline segment immediately west of the federal CSRM
project limits is referenced as the "West Beach" and extends approximately 7,500 ft. between
Stations 170+00 to 245+00 (near Schooner Drive.). The final shoreline segment, approximately
2,500 ft. long, is located at the western end of Ocean Isle Beach between Stations 245+00 and
270+00 (the end of Ocean Isle W. Blvd.), adjacent to Tubbs Inlet, and referenced as the "West
End". The segments, from east to west, are defined in Table 2 and shown in Figure 5.
Table 2. Ocean Isle Beach Monitoring Segments
SHORELINE
SEGMENTS
STATIONS
DESCRIPTION
OIB Inlet
-35+00 to -5+00
Radial profiles on west side of Shallotte Inlet shoreline
East Beach
0+00 to 80+00
Eastern limit of oceanfront homes to Goldsboro Street
Central Beach
80+00 to 170+00
Goldsboro Street to Sea Turtle Path
West Beach
170+00 to 245+00
Sea Turtle Path to Schooner Drive
West End
245+00 to 270+00
Schooner Drive to the end of Ocean Isle W Blvd
IM
ME
UIB Inlet
Shoreline
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Figure 5. Ocean Isle Beach Shoreline Monitoring Segments.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC
PAGE 6

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
The Holden Beach monitoring area is subdivided into two (2) segments. The first shoreline
segment on Holden Beach is "HB Inlet" shoreline. This area is located along the Shallotte Inlet
eastern shoreline and is represented by profiles located at Stations 403+00 through 425+00. The
shoreline within this segment is presently designated as an Inlet Hazard Area (IHA) and was
excluded from the shoreline change and volumetric analysis due to the variable/erratic nature of
the changes within the IHA. This area will be evaluated each spring based on an inlet shoreline
threshold established within the Plan. The shoreline segment to the west, designated as "Holden
Beach", spans approximately 10,000 ft. and covers the westernmost developed portion of Holden
Beach between Stations 300+00 (Sailfish Street) and 400+00 (Ocean Blvd. W.). The segments,
from east to west, are defined in Table 3 and shown in Figure 6.
Table 3. Holden Beach Monitoring Segments
SHORELINE
SEGMENTS
STATIONS
DESCRIPTION
Holden Beach
300+00 to 400+00
Sailfish Street to end of Ocean Blvd W
HB Inlet
403+00 to 425+00
Radial profiles on east side of Shallotte Inlet shoreline
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}
HB Inlet "olden Beach
Q } 0
O
O
1 • _ 1 _ Shoreline
Feet
0 1.250 2.500
Figure 6. Holden Beach Shoreline Monitoring Segments.
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Notable Events
Natural and man-made factors can alter the "typical" hydrodynamic conditions along the beach,
either at a localized point or along the entire project area. Major storm events (i.e., nor'easters or
hurricanes) can drastically alter the wind and wave conditions for a short duration, however the
impacts of such storms can be documented along the beach for long periods of time. Additionally,
waterfront projects have the potential to impart both long and short-term signatures on the
shoreline should they alter the natural coastal processes. Local construction projects, including
beach nourishment can also result in shoreline change. Table 4 provides a list of notable events
that have occurred during this monitoring period and, if applicable, will be referred to throughout
the report.
Table 4. Recent Notable Events
DREDGING/BEACH NOURISHMENT PROJECTS
Beach Fill Volume
Projects
Time Period
Dredging Area
(placed on Ocean
Isle Beach)
Dredging occurred in
2022 Federal CSRM
February — March
Shallotte Inlet and beach
Project & Accretion Fillet
2022
fill was placed on Ocean
757,000 cy
Isle Beach between Sta.
0+00 and 80+00.
Note: Reported volumes were not included in the analysis and are for informational purposes only.
WEATHER EVENTS
Event
Time Period
Comments
The project area was impacted by avg. wave
Tropical Storm Earl
Sept. 7 — Sept. 14,
heights of 2.1 ft. with a max. height of 9.4 ft. and
2022
an avg. period of 8.9 sec and a max period of 25.6
sec.
The project area was impacted by avg. wave
Hurricane Ian
Sept. 28 — Oct. 2,
heights of 3.6 ft. with a max. height of 13.5 ft. and
2022
an avg. period of 8.3 sec and a max period of 25.6
sec..
WATERFRONT PROJECTS
Project
Time Period
Comments
Ocean Isle Beach
November 2021 —
Terminal groin constructed near Sta. 0+00.
Terminal Groin Project
April 2022
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TOWN OF OCEAN ISLE BEACH
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Method for Determining Shoreline Changes
Linear shoreline change is calculated by comparing shoreline positions of the Mean High Water
(MHW) contour (+1.8 ft. NAVD88) along shore perpendicular transects over time. This linear
change in the position of the shoreline moving either landward or seaward, is often easier for the
general public to visualize. Shoreline change can be determined in terms of the actual linear
change measured between surveys or as a rate in an annualized form. Rates computed for the
Ocean Isle Beach and Holden Beach monitoring areas were calculated using a linear regression
(least squares analysis) method. The rate is calculated by determining the slope of the linear
trendline for the MHW shoreline position for the June and December 2022 survey events. These
rates are described in terms of positive (+) for advance (shoreline moving seaward) and negative
(-) for recession (shoreline moving landward). The MHW contour is typically a more active
contour due to its location and reflects both short-term changes in the beach due to daily tides and
hydrodynamic conditions as well as the overall long-term component of shoreline movement.
Tracking this contour is useful as it provides a visualization of the beach condition at discrete times
and can be used to examine the seasonal component of shoreline change.
It is important for the reader to note that although shoreline change can be an indicator of loss or
gain of beach width, the nature of sand movement in response to wave and water level conditions
makes shoreline position highly variable temporally. The response to a beach due to storm
conditions typically results in a steepening of the beach slope near the water line and the movement
of sand in the seaward direction forming offshore sand bars. During calmer wave periods, the
beach often recovers as sand moves landward. Typically, the beach exhibits a steeper slope and
narrower dry sand beach in the winter; whereas the beach slope is less steep in the summer and the
dry beach is generally wider.
Method for Determining Volumetric Changes
The volumetric analysis calculated the volume change and rate of change at each profile to assess
the recent changes that have taken place above the -18 ft. contours (referenced to NAVD88). All
volumetric changes along a profile, or averaged over multiple profiles, are given in cubic yards
per linear foot. At times, this report also provides total volume in cubic yards measured between
certain profiles. These volumes are based on the average end area method; whereby the average
volume change between adjacent profiles is multiplied by the distance between those profiles. The
volume rate of change calculated at each monitoring station was also normalized to an annual rate
used to evaluate spatial changes.
Establishment of Shoreline and Inlet Shoreline Thresholds
In order to assess the performance of the Shoreline Protection Project and any potential impacts it
may have had on the adjacent shorelines; the historic oceanfront shoreline and inlet shoreline
positions were evaluated. As described in the Shoreline and Inlet Management Plan (CPE-NC,
2016), shoreline change rate thresholds were established at each monitoring station along the
oceanfront shorelines of Ocean Isle Beach and Holden Beach to assess the extent of the shoreline
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TOWN OF OCEAN ISLE BEACH
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MONITORING REPORT
changes during the initial monitoring period. The oceanfront shoreline change rate thresholds were
determined based on the long-term shoreline trends as well as the larger short-term shoreline
fluctuations that naturally occur.
Comparable shoreline change rate thresholds were not established for the inlet radial monitoring
stations around the Shallotte Inlet's east and west shoulders (Figure 4), which are included in the
area presently designated as an Inlet Hazard Area, due to the inherent variability of the inlet
shorelines and the lack of definitive shoreline trends because of the dynamic fluctuations in
response to the natural changes of the inlet morphodynamics (i.e. offshore depths, ebb shoal
configuration, flood channel location). As discussed in greater detail below, digitized shorelines
from a post -construction aerial image were compared to pre -construction inlet shoreline thresholds
established for Ocean Isle Beach and Holden Beach.
Pre -construction Shoreline Change - Pre -construction shoreline change rates along the Ocean Isle
Beach oceanfront monitoring areas were computed using long-term shoreline position data from
surveys conducted between December 2001 and July 2021, a period that includes several severe
hurricanes and four maintenance events of the federal CSRM project. The initial federal CSRM
project was completed in May 2001. Along Holden Beach, the pre -construction shoreline change
rates were computed using long-term shoreline position data from surveys conducted at 1,000 ft.
intervals from January 2007 to April 2022. Because the surveys along Holden Beach performed
before the construction of the Shoreline Protection Project were not collected at the same interval
(500 ft.) as the post -construction surveys, pre -construction rates at the 500 ft-spaced monitoring
stations were determined by averaging the rates of the adjacent 1,000 ft. monitoring stations. This
was done to create an "apples to apples" comparison of the pre -construction rates with the post -
construction rates which were calculated at 500 ft. intervals between the June 2022 and December
2022 monitoring events.
Using the historical survey data, pre -construction shoreline change rates were computed at each
monitoring station using a least squares analysis of the long-term shoreline position data. In a least
squares analysis, a "best fit" line is calculated that minimizes the historical data's deviations from
this fitted line, with the slope of the line representing the shoreline change trend for that transect.
A least squares fit was used to determine the best representative shoreline change trend and to
address the issue of natural variability inherent in historical data.
Shoreline Change Thresholds - When comparisons are made between the pre -construction and
post -construction June 2022 to December 2022 shoreline change rates for each monitoring station,
it is important to be able to determine whether changes in the rates can be attributed to the project
construction or if the changes are within the range of expected normal variation for the pre -
construction period (2001 to 2021). To do so, regression statistics were performed to establish the
95%-confidence limits for the pre -construction trend lines for each oceanfront monitoring station
in Ocean Isle Beach and Holden Beach, as shown in Figure 7 and Figure 8. The 95%-confidence
interval suggests that there is a 95% certainty that the trend line rate, as determined by the least
squares fit, is located within the upper and lower limits for each monitoring station. The upper
and lower threshold limits were computing by adding/subtracting one-half of the 95% confidence
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC
PAGE 10

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
interval from the pre -construction shoreline change rates. The establishment of this 95%
confidence interval has been the basis for the determination of the shoreline change rate thresholds.
Post -construction Shoreline Change Rates - The monitoring program measures relatively short-
term post -construction changes (at 6-month intervals) that will be used to establish a long-term
post -construction trend. This data can then be compared to the long-term pre -construction
conditions to determine if any thresholds have been exceeded at any given monitoring station. As
previously mentioned, a linear regression (least squares fit) was computed for all the post -
construction MHW shoreline data for the June and December 2022 survey events. A three-point
average was applied to the individual least squares shoreline change rates that were measured at
each station to smooth the data along the monitoring areas, while maintaining the observed trends.
These longshore average post -construction rates for each profile will then be compared to the
threshold rate for each station. This process accounts for any natural, large short-term shoreline
fluctuations that could be mis-identified as project -related.
150
+
125
T
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s
3
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100
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-50
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Ocean Isle:
L^
75
..
Beach Pier:
-100
-125
-150
Aa8M 8aaM
USACE BASELINE STATIONS
—Least Squares Trend —95% Confidence (Upper) —95% Confidence (Lower)
Figure 7. 95% Confidence intervals for Ocean isle Beach Monitoring Stations.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC
PAGE 11

a� 150
+°� w 125
0 0
= s
s
'^ 100
75
r
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a
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to -75
-100
-125
-150
TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
0 0 0 0 0 0 0
0 0 0 0 0 0 0
o m m m m n 0
7 m m m m m m
—Least Squares Trend
0 0 0 0 0 0
0 0 0 0 0 0
0 0 a 0
.lby[oA1-fivi441►1*11filI[[a]►V
—95% Confidence (Upper)
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
n o o n o n o
m m m m m m m m
—95% Confidence (Lower)
Figure 8. 95% Confidence Intervals for Holden Beach Monitoring Stations.
Shallotte Inlet Shoreline Thresholds - Changes in the position of the inlet shoreline on the east end
of Ocean Isle Beach between Sta. -5+00 and -35+00 are highly variable and as such were not
included in the shoreline change threshold analysis. To assess the changes of the inlet shoreline
in this area, the March 1999 configuration of the sand spit, as shown in Figure 9, was established
as the threshold for the inlet shoreline on the east end of Ocean Isle Beach. On the Holden Beach
side of Shallotte Inlet, the established inlet shoreline threshold, as shown in Figure 9, was based
on the maximum shoreline excursions that occurred between October 2005 and January 2013 and
provides a 300-foot buffer between the threshold and the ocean front structures.
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
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Figure 9. Shallotte Inlet Shoreline Thresholds.
To account for possible short-term shoreline changes that could be caused by storm events or other
factors, the Plan established a 2-year confirmation period if an observed shoreline change rate
exceeds the threshold rate lower limit at any station. This was established to confirm the observed
trend. If the shoreline change rate exceeds the threshold rate over the entire 2-year confirmation
period, an assessment of the proper responsive measures would be made in coordination with State
and Federal regulatory officials. If, however, the shoreline change rate decreases below the
threshold rate during the confirmation period, the 2-year confirmation period would be reset.
Similar to the shoreline change threshold analysis, if responses along the Ocean Isle Beach or
Holden Beach inlet shorelines exceed the established inlet shoreline thresholds and continue to
exceed the thresholds throughout the 2-year confirmation period, an assessment of the proper
responsive measures would be made. However, if the inlet shoreline advanced waterward of the
established inlet shoreline threshold during the confirmation period, the 2-year confirmation period
would be reset. In the event the area is impacted by a catastrophic storm such as a hurricane or
severe nor'easter that causes major changes to the shoreline, subsequent shoreline changes would
likely exceed the thresholds for some time. If after the 2-year post -storm confirmation period
shoreline changes are still being impacted by the storm -induced changes and some of the measured
shoreline changes still exceed the thresholds, an assessment will be made to determine if a new
reference shoreline condition is needed to adequately evaluate potential project induced shoreline
impacts that occur following the storm.
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2022 SHORELINE AND INLET ANNUAL
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RESULTS & ANALYSIS
MHW Shoreline Chance Analysis
Ocean Isle Beach
The June 2022 and December 2022 positions of the MHW contour (+1.8 ft. NAVD88) were
analyzed along the ocean shoreline of Ocean Isle Beach to assess the shoreline changes between
the initial monitoring surveys. The shoreline change within the OIB Inlet segment (Sta. -35+00 to
-5+00) was excluded from the shoreline change analysis due to the variable/erratic nature of the
changes within the Inlet Hazard Area. The June 2022 survey will serve as the baseline to compare
subsequent monitoring surveys to assess long-term trends; however, this report only assesses the
recent changes between the June 2022 and December 2022 surveys. A summary of the average
shoreline changes computed for the MHW contour for each segment of the monitoring area, which
includes the area where fill was placed (Sta. 0+00 to Sta. 80+00) as part of the Ocean Isle Beach
Shoreline Protection project (accretion fillet) and the 2022 federal CSRM project, are provided in
Table 5.
Table 5. Summary of OIB MHW Shoreline Changes
Parameters
East Beach
Central Beach
West Beach
West End
(0+00-80+00)
(80+00-170+00)
(170+00-245+00)
(245+00-270+00)
June 2022 to December 2022
Avg. Change
-27 0
17.5
0.2
-11.6
(ft.)
Avg. Change Rate
-53.9
34.8
0.4
-23.2
(ft./ r.)
East Beach — This shoreline segment is representative of the area where beach fill was placed as
part of the Ocean Isle Beach Shoreline Protection project and the 2022 federal CSRM project.
Volume quantities provided by the USACE indicated that approximately 757,000 cubic yards of
beach fill was placed between the terminal groin and Goldsboro St. (Sta. 0+00 to Sta. 80+00)
between February and March 2022 to construct both the accretion fillet and the federal CSRM
project. The pre- and post -placement surveys also show the position of the MHW contour moved
seaward by an average of 194.1 ft. as a result of the fill placement. A comparison of the post -
placement beach fill survey and the first monitoring survey conducted in June 2022 indicate the
position of the MHW shoreline receded landward an average distance of -30.3 ft.
When comparing the December 2022 survey to the June 2022 baseline survey the data clearly
show the shoreline where fill was placed receded during this time period as depicted in Figure 10.
These figures show the changes in the MHW shoreline position relative to the June 2022 shoreline
position. The analysis of the data from June 2022 to December 2022 indicates that the position of
the MHW contour receded an average distance of 27.0 ft., which is equivalent to a rate of -53.9
ft./yr. over the 6-month monitoring period. The changes measured within this segment varied from
a landward movement of 66.8 ft. at Station 5+00 to a seaward movement of 9.1 ft. at Station 80+00.
The recession rate measured during the recent period (-53.9 ft/yr.) is likely attributed to
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
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equilibration of the post -construction shoreline following the fill placement for the Shoreline
Protection Project and the 2022 federal CSRM project that were completed in March/April 2022.
The MHW changes are shown graphically in Figure 10.
Central Beach — The changes along this segment varied between the beach east of the Ocean Isle
Beach pier and west of the pier. The results show that the eastern 6,000 ft. of shoreline experienced
positive changes (seaward movement) in the position of the MHW contour during the 6-month
monitoring period, between Goldsboro St. and the Ocean Isle Beach Pier (Sta. 80+00 to Sta.
140+00), negative changes (landward movement) between the pier and Oxford St. (Sta. 145+00 to
Sta. 155+00), and positive changes from Troy St. to Sea Turtle Path (Sta. 160+00 to Sta. 170+00).
The data appears to indicate a shoreline response to the pier structure located between Stations
140+00 and 145+00. Figure 10 clearly shows the change in the shoreline trend from positive to
negative in proximity of the Ocean Isle Beach pier as indicated by the black solid line. It should
be noted that no fill was placed in the Central Beach shoreline segment as part of the Ocean Isle
Beach Shoreline Protection project and the 2022 federal CSRM project; however, it is likely that
some of the fill placed at the western end of the CSRM project migrated into this segment during
the 6-month period between June and December 2022, influencing the positive changes between
Sta. 80+00 and Sta. 140+00.
The analysis of the data comparing the June 2022 to December 2022 surveys indicate that on
average, throughout the entire segment, the position of the MHW contour advanced seaward an
average distance of 17.5 ft., which is equivalent to a rate of 34.8 ft./yr. (seaward movement). The
changes measured within this segment varied from a seaward movement of 63.6 ft. at Station
130+00 to a landward movement of 40 ft. at Station 145+00 (located approximately 150 ft. west
of the Ocean Isle Beach pier) as shown in Figure 10.
West Beach — The changes along this segment show the shoreline fluctuated between seaward and
landward movements along the 7,500 ft. segment. The eastern 3,000 ft. generally experienced a
seaward movement averaging 4 ft. between Sta. 170+00 and Sta. 200+00. The next 2,000 ft. show
the shoreline experienced erosion by an average of 18 ft. since the June 2022 survey between Sta.
205+00 and Sta. 225+00, however, the adjacent shorelines at stations east and west of this
erosional area have both migrated seaward over this same period. The shoreline between Stations
230+00 and 240+00 moved seaward an average distance of 35.4 ft. The westernmost profile (Sta.
245+00) shows the shoreline experienced rather significant erosion of approximately 40 feet
during the monitoring cycle. The erosion in this segment was likely influenced by the impacts
from Hurricane Ian that tracked near Ocean Isle Beach in late September 2022.
The analysis of the shoreline position in this segment showed the location of the MHW contour
fluctuated between positive and negative changes when comparing the June and December 2022
surveys. The results indicate that from June 2022 to December 2022 the position of the MHW
shoreline within this segment on average experienced minimal net change of 0.2 ft. seaward, which
represents an average rate of 0.4 ft./yr. The changes measured within this segment varied from a
landward movement of 39.9 ft. at Station 245+00 to a seaward movement of 45.4 ft. at Station
235+00 as shown in Figure 10.
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2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
West End — The analysis of the recent period changes along the West End segment indicated a net
recession of the shoreline and a volume loss above the -18 ft. NAVD88 contour. The monitoring
data indicates the average MHW shoreline migrated landward an average distance of 11.6 ft.
between the 6-month June 2022 to December 2022 period. The analysis of the volume changes
indicates the segment lost an average 23.2 cy/ft., equivalent to a loss of approximately 3 8, 100 CY
from June 2022 to December 2022 within the active profile (above -18 ft. NAVD88). All stations
within this segment experienced volume losses. The profile plots provided in Appendix A show
this area of the beach experienced major losses to the dunes, some volume gains along the beach
face, more losses on the submerged portions of the profiles, primarily below -6 ft. NAVD88. The
changes in this segment are likely influenced by the impacts from Hurricane Ian that tracked near
the area in late September 2022 as well as the dynamic fluctuations in response to the natural
changes of the inlet morphodynamics (i.e., offshore depths, ebb shoal configuration, flood channel
location) of Tubbs Inlet.
200
West West
Central East
End Beach
Beach Beach
i
o
150
CA
d
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r
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Beach Pier
t
4
50
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O"
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USACE BASELINE STATIONS (FEET)
--*—June 2022 to Dec. 2022
Figure 10. Ocean Isle Beach MHW Shoreline Change since June 2022.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
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Holden Beach
The June 2022 and December 2022 positions of the MHW contour (+1.8 ft. NAVD88) were
analyzed along the ocean shoreline of Holden Beach to assess the shoreline changes between the
initial monitoring surveys. The shoreline change within the HB Inlet segment (Sta. 403+00 to
425+00) was excluded from the shoreline change analysis due to the variable/erratic nature of the
changes within the Inlet Hazard Area. The June 2022 survey will serve as the baseline to compare
subsequent monitoring surveys to assess long-term trends; however, this report only assesses the
recent changes between the June 2022 and December 2022 surveys. A summary of the average
MHW shoreline changes for the Holden Beach shoreline segment are provided in Table 6 and
shown graphically in Figure 11 .
Table 6. Summary of Holden Beach MHW Shoreline Changes
Parameters
7— Holden Beach
(300+00-400+00)
June 2022 to December 2022
Avg. Change
10.6
(ft.)
Avg. Change Rate
21.1
(ft./yr.)
100 .
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V5ACE BASELINE STATIONS (FEET)
-December 2022
Figure 11. Holden Beach MHW Shoreline Change since June 2022.
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PAGE 17

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
The shoreline changes along the nearly 2-mile Holden Beach oceanfront segment were generally
positive between June and December 2022. The analysis shows that the average position of the
MHW shoreline along the entire segment advanced 10.6 ft. which represents an average rate of
+21.1 ft./yr. (seaward movement) over the 6-month monitoring period. All stations experienced
shoreline advances except for three profiles at Stations 335+00, 360+00, and 395+00 during the
monitoring timeframe. Based on a review of the profiles, the erosion at Stations 335+00, 360+00,
and 395+00 was related to erosion of the beach face. Impacts to the dunes along the 2,500 feet of
shoreline nearest to Shallotte Inlet (Sta. 375+00 to 400+00) were also observed between the
conditions in June and December 2022, which are likely attributed to impacts from Hurricane Ian.
The overall changes measured within this segment varied from a landward movement of 47.2 ft.
at Station 335+00 to a seaward movement of 40.5 ft. at Station 365+00 as shown in Figure 11.
Volume Change Analysis
Ocean Isle Beach
As previously stated, the shoreline within the Shallotte Inlet shoreline segments is designated as
an Inlet Hazard Area (IHA) and was excluded from the volumetric analysis due to the
variable/erratic nature of the changes within the IHA. Overall, the results of analysis of the June
2022 and December 2022 data sets from the other shoreline segments along Ocean Isle Beach
demonstrates a net volume loss throughout the East Beach, West Beach, and West End segments
and a slight net volume gain in the Central Beach segment. The East Beach and West End
segments experienced the highest losses at annual average rates of 28.4 cy/ft./yr. and 28.9 cy/ft./yr.
(erosion), respectively, whereas the Central Beach segment experienced an average gain of 0.9
cy/ft./yr. Table 7 provides a summary of the volumetric changes calculated for each of the
monitoring areas above -18 ft. NAVD88.
Table 7. Ocean Isle Beach Volumetric Changes Above -18 ft. NAVD88
Parameters
East Beach
Central Beach
West Beach
West End
(245+00-
(0+00-80+00)
(80+00-170+00)
(170+00-245+00)
270+00)
June 2022 to December 2022
Average Change
-14.2
0.4
-4.7
-14.4
(c /ft.)
Avg. Change Rate
-28 4
0.9
-9.3
-28.9
c /ft./ r.
Total Volume
-106,000
6,800
-29,400
-38,100
(c )
East Beach — Based on the volumetric analysis performed by the USACE, approximately 757,000
cubic yards of beach fill was placed between the terminal groin and Goldsboro St. (Sta. 0+00 to
Sta. 80+00) between February and March 2022 to construct both the accretion fillet and the federal
CSRM project. Between the post -placement survey and June 2022, a loss of approximately 49,000
cy was measured in this segment. This loss equates to an average rate of -20.9 cy/ft./yr. Higher
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
than normal erosion rates are to be expected as the shoreline equilibrates following the beach fill
placement that was completed in March 2022.
During the recent period, the data shows a negative trend with volume losses on all profiles as
depicted in Figure 12, which depicts the annualized volume change rates. The changes across the
entire segment resulted in an average loss of 14.2 cy/ft., which is equivalent to an average erosion
rate of -28.4 cy/ft./yr. The volume losses ranged from -54.7 cy/ft. at Station 0+00 to -3.0 cy/ft. at
Station 80+00. The overall results determined a net volumetric loss along this segment of
approximately 106,000 cy above the -18 ft. NAVD88 contour.
+
a�
120
West West
Central East
y
c
E
100
End Beach
Beach Beach
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20
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O
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Beach Pier —
-80
— —
-100
—
-120
00 00 ,fJO 00 ,fJO 00 00 ,fJO 00 ,�00
O O
00 00 ,�JO 00 ,�00 00 00 ,p0 CiS � 00 00 � 00 � 00 00 00
0 O & O" O e
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,y{o y4i tia y3 ,y'ti yti yo° 0 � '1 ro h A
USACE BASELINE STATIONS (FEET)
—June 2022 to December 2022
Figure 12. Ocean Isle Beach Annualized Volume Change Rates above -18 ft. NAVD88.
Central Beach — During the recent period, the data shows the net change within this segment was
relatively minimal, indicating a balance in the losses and gains in the segment. It should be noted
that no fill was placed in the Central Beach shoreline segment as part of the Ocean Isle Beach
Shoreline Protection project and the 2022 federal CSRM project. The changes across the entire
segment resulted in an average positive rate of 0.9 cy/ft./yr. The data appears to indicate a
shoreline response associated with the pier structure located between Stations 140+00 and 145+00.
Figure 12 clearly shows the volume change trend shifting from positive to negative in proximity
of the Ocean Isle Beach pier as indicated by the solid black line. The volume changes measured
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TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
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ranged from a gain of 17.0 cy/ft. at Station 130+00 to a loss of -10.4 cy/ft. at Station 145+00 as
shown in Figure 12. The overall results determined a net volumetric gain along this segment of
approximately 6,800 cy above -18 ft. NAVD88.
West Beach — The recent volume change results show the West Beach section experienced a net
loss averaging 4.7 cy/ft., equivalent to an overall erosion of approximately 29,400 cy during the
6-month period. A review of the changes at each monitoring station shows this segment primarily
experienced losses as shown in Figure 12. The values measured ranged from -22.4 cy/ft. at Station
245+00 to +5.5 cy/ft. at Station 195+00.
West End — The changes measured over the recent monitoring period indicate the segment
experienced a net loss of material above the -18 ft. NAVD88 contour. The volume change
calculated between June 2022 and December 2022 measured an average loss of 14.4 cy/ft.,
equivalent to a loss of approximately 38,100 cy. A profile -by -profile analysis shows that all
profiles in this segment eroded during the monitoring period. The losses are likely attributed to
the impacts sustained from Hurricane Ian in late September 2022 in addition to being influenced
by the dynamic changes associated with the fluctuations of the Tubbs Inlet ebb shoal.
Holden Beach
The volumetric analysis of the recent changes, as shown in Table 8, indicate the Holden Beach
segment has maintained a net positive volume, averaging a net gain of 2.2 cy/ft. at an annual
average rate of 4.5 cy/ft./yr. (accretion) over the 6-month period. The rates along the segment
varied, generally transitioning from positive to negative from east to west and ranging from -40.8
cy/ft./yr. (Station 335+00) to 47.9 cy/ft./yr. (Station 390+00). A review of the results shows a gain
in volume between Stations 380+00 and 400+00 which are the profiles closest to Shallotte Inlet as
shown in Figure 13, which depicts the annualized volume change rates. A review of the results
shows the volume gains were observed on average below -8 ft NAVD88 and above -8 ft NAVD88
volume losses were observed on average.
Table 8. Holden Beach Volumetric Changes above -18 ft. NAVD88
Parameters
Holden Beach
(300+00-400+00)
June 2022 to December 2022
Average Change
2.2
c / ft.
Avg. Change Rate
4.5
(cy/ft./yr.)
Total Volume
18,700
c
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— 100
W
0 0 80 —
M s
s�
s
60 —
}
� 40
LU
Q
0 20
z
Q
V
W
2 0
-20
-40
-60
k k°O �O k°O x°O k°O k k k°O k x°O k°O k
50
1011
USACE BASELINE STATIONS (FEET)
—June 2022 to December 2022
Figure 13. Holden Beach Annualized Volume Change Rates above -18 ft. NAVD88.
PROJECT IMPACTS / PERFORMANCE TO DATE
Shoreline Change Threshold Analysis
The shoreline change thresholds are based on 95% confidence intervals established around the
computed pre -construction shoreline change trends for both Ocean Isle Beach and Holden Beach.
The shoreline change threshold upper and lower rates were determined by adding/subtracting one-
half of the 95% confidence interval from the pre -construction shoreline change rate established for
each monitoring station. The threshold lower rates are used to determine whether the post -
construction shoreline change rates can be attributed to the project construction or if it is within
the range of expected normal variation for the pre -construction period.
Table 9 provides the pre -construction shoreline change rates for the Ocean Isle Beach and Holden
Beach oceanfront monitoring stations, the rates representing the shoreline change threshold lower
limits, and the June 2022 to December 2022 post -construction shoreline change rates and
longshore average rates. Stations where the post -construction shoreline change rate exceeded the
lower threshold limit are bolded and shaded. Figure 14 and Figure 15 show the long-term (pre -
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construction) change rates (black solid line), upper and lower shoreline thresholds (black dashed
lines), compared to the June 2022 to December 2022 post -construction longshore average (3-point
average) shoreline change rates.
Table 9. Shoreline Chan a Rate (FT/YR) Threshold Comparison
Monitoring
Station
Pre -Construction
Longshore
Average
Shoreline
Change
Threshold Lower
Limit
June 2022 to December 2022
Least Squares
Longshore
Average
OCEAN ISLE BEACH
0+00
-9.2
-102.3
-122.0
-
5+00
-7.9
-94.1
-133.1
-117.1
10+00
-9.6
-91.8
-96.3
-90.1
15+00
-8.7
-92.0
-40.8
-69.9
20+00
-8.3
-96.6
-72.6
-46.3
25+00
-11.1
-92.4
-25.5
-45.5
30+00
-11.8
-88.9
-38.3
-23.0
35+00
-10.9
-83.5
-5.2
-34.5
40+00
-10.3
-76.5
-60.0
-45.7
45+00
-9.3
-71.0
-71.7
-70.5
50+00
-8.1
-59.2
-79.6
-73.3
55+00
-5.2
-47.6
-68.6
-65.9
60+00
-4.3
-42.5
-49.5
-59.8
65+00
-5.1
-36.6
-61.3
-37.5
70+00
-5.6
-36.0
-1.8
-23.9
75+00
-4.7
-36.4
-8.7
2.6
80+00
-4.3
-37.7
18.3
17.5
85+00
-5.8
-39.4
42.9
33.0
90+00
-6.6
-40.1
37.7
38.4
95+00
-6.8
-39.3
34.6
32.8
100+00
-6.7
-37.6
26.1
25.0
105+00
-7.3
-38.6
14.1
32.6
110+00
-6.7
-36.2
57.4
43.3
115+00
-5.5
-35.8
58.3
57.5
120+00
-7.0
-33.7
56.8
66.8
125+00
-7.3
-33.8
85.4
89.7
130+00
-8.2
-37.3
126.9
98.0
135+00
-7.3
-33.1
81.6
82.9
140+00
-6.7
-31.0
40.1
14.0
145+00
-4.6
-26.3
-79.7
-20.2
150+00
-3.1
-23.5
-20.9
-34.5
155+00
-2.1
-22.5
-3.0
5.0
160+00
-3.0
-21.5
38.9
23.3
165+00
-0.4
-12.9
34.1
28.2
170+00
-1.2
-17.6
11.6
21.3
175+00
-1.9
-21.7
18.2
17.8
180+00
-1.6
-20.0
23.5
8.0
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC
PAGE 22

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Monitoring
Station
Pre -Construction
Longshore
Average
Shoreline
Change
Threshold Lower
Limit
June 2022 to December 2022
Least Squares
Longshore
Average
185+00
0.1
-20.7
-17.8
3.1
190+00
1.4
-19.0
3.6
0.7
195+00
0.4
-16.8
16.2
6.4
200+00
1.7
-19.8
-0.6
-13.7
205+00
2.4
-22.3
-56.5
-22.8
210+00
2.2
-21.1
-11.4
-34.3
215+00
2.7
-20.3
-34.9
-21.8
220+00
2.0
-16.6
-19.1
-37.6
225+00
1.9
-20.5
-58.8
-12.6
230+00
1.5
-17.5
40.1
23.9
235+00
0.8
-18.0
90.6
70.6
240+00
-0.1
-21.2
81.2
30.7
245+00
0.0
-21.0
-79.5
-15.9
250+00
-0.5
-24.3
-49.3
-51.8
255+00
-2.8
-40.1
-26.5
-8.7
260+00
-3.3
-38.1
49.7
25.3
265+00
-6.8
-65.6
52.8
5.3
270+00
-11.9
-104.7
-86.5
-
HOLDEN BEACH
300+00
7.1
-30.8
33.9
-
305+00
6.9
-29.3
43.4
35.6
310+00
6.7
-27.7
29.4
36.7
315+00
6.4
-27.8
37.5
33.0
320+00
6.1
-28.0
32.0
27.2
325+00
6.3
-30.5
12.2
23.9
330+00
6.5
-33.0
27.5
-18.2
335+00
5.9
-28.6
-94.1
-20.0
340+00
5.2
-24.2
6.5
-17.8
345+00
4.5
-21.6
34.3
30.3
350+00
3.8
-18.9
50.1
49.5
355+00
1.2
-20.8
64.0
35.0
360+00
-1.5
-22.6
-9.2
45.2
365+00
-2.3
-34.1
80.8
32.7
370+00
-3.1
-45.6
26.4
41.5
375+00
-7.1
-57.3
17.3
18.5
380+00
-11.2
-68.9
11.9
21.7
385+00
-10.5
-70.6
36.1
25.5
390+00
-9.9
-72.2
28.5
2.0
395+00
-10.1
-73.4
-58.5
1.2
400+00
-10.2
-74.7
33.6
-
*Note: Stations where the post -construction shoreline change rate exceeded the lower threshold limit are bolded
and shaded.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 23

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
150
W
v,
125
o
s
3
{A
100
a+
y
C
75
�
Y
sa
...... —mommomomm..
LL.................
W
...........
................. .......
Q
25
W
z
o
Q
x
-2s
W
z
J
LU
so
O
_
ocean Isle:
-75
eacF Pier:
-100
-125
-150
.............................................
ao
USACE BASELINE STATIONS
—Pre-Construction —Upper Threshold —Lower Threshold —Post-Construction (June 2022-Dec 2022)
Figure 14. Shoreline Change Rates on Ocean Isle Beach.
A comparison of the shoreline change threshold rates and the June 2022 to December 2022
shoreline change rates (3-point longshore average) show that in total 11 of the 53 profiles exceeded
the lower threshold rates. As seen in Figure 14, five (5) of the profiles are located along the eastern
7,000 ft. of the island, one (1) profile is located just east of the fishing pier, and the remaining five
(5) profiles are located on the western 6,500 ft. of the island. The post -construction shoreline
change rates on the eastern 7,000 ft. of the island clearly show a trend of shoreline recession that
is generally consistent with conditions observed following the construction of a beach fill project
as the fill equilibrates in response to the local wind, wave, and tide conditions. The shoreline
changes in this area are expected to moderate as the beach in this area continues to equilibrate.
The singular exceedance at Station 150+00, located approximately 650 ft. east of the fishing pier,
appears to be an anomaly. The profile plots show a buildup of sand on the beach face east of the
pier and a loss of sand on the profiles immediately west of the pier, however, in light of its
proximity to the pier, the storm conditions experienced during the 6-month monitoring period, and
the reversal of the shoreline trend in the vicinity of the pier suggests that the exceedance at Station
150+00 may be influenced by the morphodynamic changes occurring in proximity to the fishing
pier. The remaining six (6) profiles along the western 6,500 ft. of the island where the thresholds
were exceeded are likely attributed to the impacts to the beach and dune that were sustained in this
area from Hurricane Ian in late September 2022. As the beach in this area continues to recover
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 24

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
from the storm impacts, it is anticipated that the shoreline changes will moderate. It should be
noted that the observed exceedances may also be attributed to the evaluation of a naturally dynamic
system within the relatively short duration of the initial 6-month monitoring period.
Based on the threshold criteria which requires a 2-year confirmation period no action is needed at
this time to address the 11 stations on Ocean Isle Beach where the post -construction shoreline
change rates exceeded the threshold during this initial assessment. If any of these stations exceed
the threshold following the 2-year confirmation period, coordination with regulatory officials will
commence to discuss the potential causation. If, however, the shoreline change rate at any of these
stations decreases below the threshold rate during the confirmation period, the 2-year confirmation
period would be reset.
As previously stated, the shoreline change threshold rates on Holden Beach were computed using
long-term shoreline position data from surveys conducted at 1,000 ft. intervals from January 2007
to April 2022. Since the pre -construction surveys were not collected at the 500 ft. stations along
Holden Beach, pre -construction rates for the 500 ft. monitoring stations were determined by
averaging the rates of the two adjacent monitoring stations. Shoreline change rates along the
oceanfront beach area of Holden Beach are graphically shown in Figure 15. Pre -construction rates
are generally negative (i.e., erosional) for the beach profiles in proximity to the inlet between
Stations 400+00 and 360+00, but were positive (i.e., accretional) at profiles further from the inlet.
Although no monitoring stations exceeded the threshold rates during the initial monitoring period
(June 2022 to Dec. 2022), the shoreline between Stations 330+00 and 340+00 experienced erosion
primarily due to shoreline recession on the profile at Station 335+00. As seen in Figure 15, the
majority of the monitoring stations did not approach either their pre -construction rate or the lower
threshold. The results indicate that approximately 75% of the monitoring stations on Holden
Beach experienced an average annual accretion rate of 33 ft./yr. during the monitoring period.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 25

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
a� 150
+°� w 125
o s°
s
'^ 100
75
r
H
LL 50
W
H
cr 25
W
a 0
x
u W -25
z
J
-50
O
V1 -75
-100
-125
-150
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+ + + + + + + + + + + + + + + + + + + + +
o o o o o o o o
7 m m m m m m m m m m m m m m m m m m m m
LISACE BASELINE STATIONS
—Pre-Construction —Upper Tolerance —Lower Tolerance —&— Post -Construction (June 2022-Dec2022)
Figure 15. Shoreline Change Rates on Holden Beach.
Inlet Shoreline Threshold Analysis
The inlet shorelines on the eastern end of Ocean Isle Beach (east of Sta. 0+00) and the western end
of Holden Beach (west of Sta. 400+00) have exhibited much greater variability than the oceanfront
shorelines. Because of the dynamic shoreline fluctuations caused by the direct influence of the
inlet in these areas, the shoreline change threshold analysis described in the previous section was
not considered as an appropriate means to evaluate meaningful changes to the inlet shorelines.
Instead, analysis of aerial imagery of the inlet and adjacent inlet shorelines taken in June 2022 was
employed to document the changes in the position of the inlet shorelines.
Figure 16 shows the June 2022 aerial orthomosaic image that depicts the east and west inlet
shorelines from June 2022 (yellow lines) as well as the established inlet shoreline thresholds (black
lines) for Ocean Isle Beach and Holden Beach. The June 2022 inlet shorelines were visually
interpreted from the wet/dry sand mark on the aerial image, which is generally accepted to
represent the position of the mean high-water line. The wet/dry sand mark is the line of visual
distinction along the beach between the lighter -colored, dry sand on the upper beach face and the
darker colored, wet sand below. These shorelines were then digitized to allow for comparative
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 26

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
analysis of the current inlet configuration and the established inlet shoreline thresholds on Ocean
Isle Beach and Holden Beach.
Figure 16. Shallotte Inlet Shoreline Change Plot.
The Holden Beach inlet shoreline, as represented by the June 2022 wet/dry shoreline in Figure 16
and Figure 17, shows that the entirety of the inlet shoreline did not exceed the established inlet
shoreline threshold. However, as represented in Figure 17 which depicts the distance from the
monitoring baseline to the MHW contour, measured at each of the inlet radial profiles, and the
established inlet shoreline threshold, the June 2022 inlet shoreline between Stations 416+00 and
418+00 was less than 100 ft. waterward of the established threshold.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 27

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
— — — Monitoring Baseline
North
HB Inlet Threshold
3
HBJune2022
425+00
i
421+00
418+00
a, ,r
,
', ; Holden
2 416+00 M
—
Beach
r
I
M
r r r
r
413+00 \
/
411+00
i
Radial 407+00
Number
405+00
403+00
Figure 17. Holden Beach Inlet Shoreline Change (in Feet).
The Ocean Isle Beach wet/dry inlet shoreline depicted in Figure 16, however, illustrates that while
the threshold was not exceeded along the majority of the inlet shoreline, the June 2022 wet/dry
inlet shoreline did reveal several areas where the inlet shoreline threshold was exceeded.
Specifically, the threshold was slightly exceeded on the interior inlet shoreline of Ocean Isle
Beach, adjacent to the Atlantic Intracoastal Waterway (AIWW) and along the western portion of
the inlet shoreline just east of the terminal groin between Stations -5+00 and -15+00 where the
inlet shoreline exceeded the established threshold line in this area by an average distance of 260 ft
(Figure 18). It should be noted that the shoreline in proximity to the terminal groin has
demonstrated a trend of erosion since before the construction of the structure, however, this section
of shoreline was less eroded in March 1999, prior to construction of the initial 2001 federal CSRM
project.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 28

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
North
— —Monitoring Baseline
35+00
---*-- OIB Inlet Threshold (March 1999)
-30+00
OIBJune 2022
i
-25+00
-22+00
/ /
\ -20+00
/
\
f I / -60�
\
S
tL
Ocean Isle
i
I
r++
15+00
Beach
`
M
-10+00
Radial
Number
_
0+00
Terminal
Groin
Figure 18. Ocean Isle Beach Inlet Shoreline Change (in Feet).
Since construction of the terminal groin and construction of the accretion fillet and CSRM project
were completed in April 2022 (entailing the placement of approximately 757,000 cy of sand along
—8,000 ft. of shoreline to the west of the structure), sand has been observed bypassing the structure
and being deposited in the area immediately east of the terminal groin. The aerial photo in Figure
19 was taken on May 261h, 2022, approximately two weeks prior to the acquisition of the June
2022 aerial imagery, depicts this bypassing and the creation of two sand fillets forming on the east
side of the structure. Although the material has clearly bypassed the structure, the analysis of the
June 2022 aerial imagery did not indicate that this material had been transported and deposited on
the shoreline east of the structure.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 29

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Figure 19. Sediment Bypassing the Terminal Groin (May 26r", 2022).
It is anticipated that the inlet shoreline immediately east of the structure will meet the threshold as
sand from the west continues to bypass the structure and is eventually deposited on the inlet
shoreline immediately east of the structure. In addition, this shoreline segment may continue to
benefit from the placement of dredged material by the USACE as a result of maintenance dredging
performed by the USACE within the Shallotte Inlet Crossing. The most recent project was
completed in February 2023 with the placement of approximately 75,000 cy of sand on the
shoreline east of the structure, roughly between Stations -5+00 and -20+00 (Figure 20).
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 30

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
Figure 20. USACE Navigation maintenance material placed on the inlet shoreline, east of terminal
groin (Photo taken 2/22/23).
Other than the inlet shoreline on Ocean Isle Beach between Station -5+00 and -15+00 that
continues to equilibrate to the new hydrodynamic conditions resulting from the construction of the
terminal groin and the dredging of the borrow area within Shallotte Inlet as part of the 2022 federal
CSRM project, the shoreline changes that have occurred along the Ocean Isle Beach and Holden
Beach inlet shorelines during this first monitoring cycle are within the "envelope" of the inlet
shoreline thresholds established by the Shoreline and Inlet Management Plan.
Although no action is needed at this time, the areas where the June 2022 inlet shoreline on Ocean
Isle Beach exceeded the established inlet shoreline threshold will be monitored over the 2-year
confirmation period. If the inlet shoreline moves waterward of the established threshold during
the confirmation period, the 2-year confirmation period would be reset.
Hydrographic Survey of Shallotte Inlet
In addition to the beach profile surveys at the monitoring stations on Ocean Isle Beach and Holden
Beach, a hydrographic survey of Shallotte Inlet was also conducted in June 2022 to document the
post -construction condition of the borrow area, ebb shoal configuration, and the main channel
location. Figure 20 shows the bathymetric conditions within Shallotte Inlet based on the June 2022
hydrographic survey which clearly depicts where sand was dredged from the borrow area within
the inlet as part of the 2022 federal CSRM project, the ebb shoal configuration on the east and
west sides of the inlet, and the main channel thalweg, or deepwater path through the inlet, in June
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 31

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
2022, as indicated by the solid black line. Based on these initial monitoring results, this channel
alignment does appear favorable for the Ocean Isle Beach shoulder. Continued monitoring
through comparison of subsequent hydrographic surveys is needed to determine if this trend
continues.
Ei
ATLANTIC
OCEAN
Notes:
Legend:
1. Coordinates are in feet based on the North
June 2022 Deep
Water Channel
~
Carolina State Plane Coordinate System, North
American Datum of 1983 (NAD 83).
Depths (ft NAVD88)
7-8
14 - 15
2. Background imagery collected on 2022-05-06
4 and Shallower
8 - 10
15 Deeper
by UNCW.
and
3. Shallotte Inlet bathymetric data collected in
- 4 - 6
10 - 12
June 2022. The vertical datum are in feet
Feet
based on the North American Vertical Datum
6-7
12 - 14
0 500 1,000
of 1988 (ft NAVD88).
Figure 20. June 2022 Shallotte Inlet Hydrographic Survey Elevation Map.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 32

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
CONCLUSION/FINDINGS
The first annual monitoring cycle to monitor the shoreline / inlet changes at Ocean Isle Beach and
Holden Beach following construction of the Ocean Isle Beach Shoreline Protection Project
(terminal groin and accretion fillet) and the 2022 federal CSRM project has been completed. The
Town's monitoring program evaluated linear shoreline and volumetric changes along the entirety
of Ocean Isle Beach's oceanfront shoreline and the western 10,000 feet of Holden Beach's
oceanfront shoreline as well as the inlet shorelines on the east and west shoulders of Shallotte Inlet.
Results of the 2022 annual monitoring have been discussed in terms of recent short-term changes
that occurred relative to the new June 2022 baseline survey.
Overall, the 2022 initial monitoring results of the Ocean Isle Beach linear shoreline and volumetric
change analyses show that the East Beach segment experienced the most erosion during the 6-
month monitoring period, followed by the West End and West Beach segments that also
experienced a trend of erosion during the 6-month monitoring period. The Central Beach segment
experienced variable conditions but overall indicated net accretion. However, there was a reversal
in the trend in the vicinity of the pier located between Stations 140+00 and 145+00. Initial post -
construction linear shoreline and volumetric changes analyzed along the oceanfront beach area of
Holden Beach indicates the area experienced a net accretion during the initial 6-month monitoring
period.
The shoreline threshold monitoring results along the Ocean Isle Beach oceanfront shoreline
indicate that the initial post -construction shoreline change rates for 11 out of 53 of the stations
monitored exceeded the established shoreline change rate threshold. The June 2022 wet/dry inlet
shoreline, digitized from the June 2022 aerial image, also indicated two locations along the inlet
shoreline where the established threshold was exceeded. These areas were along the interior inlet
shoreline of Ocean Isle Beach adjacent to the Atlantic Intracoastal Waterway (AIWW) and along
approximately a 1,000 ft-extent of the inlet shoreline east of the terminal groin structure, between
Stations -5+00 and-15+00. The inlet shoreline east of the structure where the threshold was
exceeded has been severely eroded since before the construction of the terminal groin, however,
this section of shoreline was less eroded in March 1999, prior to construction of the initial 2001
federal CSRM project. Following completion of the Shoreline Protection Project and the 2022
federal CSRM project, sand has been observed bypassing the structure and being deposited in the
area immediately east of the terminal groin. Continued equilibration as well as the shoreline
stabilizing from the effects of the of the beach fill projects that placed approximately 757,000 cubic
yards of sand along the eastern 8,000 ft. of Ocean Isle Beach and the associated longshore sediment
transport of sand to the west is expected to moderate future erosion in these areas. Along the
western portion of Ocean Isle Beach (west of the pier), future changes are expected to moderate
as the beach continues to recover from the impacts sustained in late Sept. 2022 from Hurricane
Ian. Although no action is needed at this time, the monitoring stations where the post -construction
shoreline change rates exceeded the threshold rates and the locations along Ocean Isle Beach's
inlet shoreline that exceeded the threshold will be monitored over the 2-year confirmation period.
The plan established a 2-year confirmation period to account for possible short-term shoreline
changes that could be caused by storm events or other factors. If during the confirmation period
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 33

TOWN OF OCEAN ISLE BEACH
2022 SHORELINE AND INLET ANNUAL
MONITORING REPORT
the shoreline change rates or inlet shoreline at the specified locations no longer exceed the
thresholds, the 2-year confirmation period would be reset. If the shoreline change rate exceeds the
threshold rate over the entire 2-year confirmation period, an assessment of the proper responsive
measures would be made.
On Holden Beach, the initial post -construction shoreline change rates along oceanfront area
indicated accretion at 18 of the 21 monitoring stations and the established pre -construction
threshold was not exceeded. Similarly, the initial monitoring results showed the June 2022 wet/dry
line representing the inlet shoreline of Holden Beach also did not exceed the established inlet
shoreline threshold.
In the event the area is impacted by a catastrophic storm such as a hurricane or severe nor'easter
that causes major changes in the shoreline, subsequent shoreline changes would likely exceed the
thresholds for some time. If after the 2-year post -storm confirmation period, shoreline changes
are still being impacted by the storm induced changes and some of the measured shoreline changes
still exceed the thresholds, an assessment will be made to determine if a new reference shoreline
condition is needed to adequately evaluate potential project induced shoreline impacts that occur
following the storm. Continued monitoring of these oceanfront and inlet monitoring stations will
help to establish more representative long-term post -construction shoreline change rates within the
study area.
REFERENCES
CPE-NC, (2016) Final Environmental Impact Statement Terminal Groin and Beach Fillet; Town
of Ocean Isle Beach, Brunswick County, North Carolina.
USACE, (2002) Ocean Isle Beach Nourishment Project: Inlet and Shoreline Monitoring Report
No. 1; Town of Ocean Isle Beach, Brunswick County, North Carolina.
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC I PAGE 34

APPENDIX A
COMPARATIVE BEACH PROFILE PLOTS FOR OCEAN ISLE BEACH
MONITORING STATIONS

Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:-35+00
20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
DISTANCES REFERENCED TO: N = 56787 FEET, E = 2186771 FEET, AZIMUTH = 88 DEGREE
-30
June 2022
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION : -30+00
DISTANCES REFERENCED TO: N = 56309 FEET, E = 2186849 FEET, AZIMUTH = 104 DEGREE
June 2022
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION : -25+00
DISTANCES REFERENCED TO: N = 55824 FEET, E = 2186727 FEET, AZIMUTH = 104 DEGREE
June 2022
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

081
will
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION : -22+00
DISTANCES REFERENCED TO: N = 55574 FEET, E = 2186665 FEET, AZIMUTH = 119 DEGREE
June 2022
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

081
will
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION : -20+00
DISTANCES REFERENCED TO: N = 55405 FEET, E = 2186490 FEET, AZIMUTH = 135 DEGREE
June 2022
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:-15+00
DISTANCES REFERENCED TO: N = 55057 FEET, E = 2186131 FEET, AZIMUTH = 135 DEGREE
June 2022
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:-10+00
DISTANCES REFERENCED TO: N = 54709 FEET, E = 2185773 FEET, AZIMUTH = 135 DEGREE
June 2022
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION : -6+00
DISTANCES REFERENCED TO: N = 54455 FEET, E = 2185514 FEET, AZIMUTH = 150 DEGREE
June 2022
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:-5+00
DISTANCES REFERENCED TO: N = 54438 FEET, E = 2185376 FEET, AZIMUTH = 172 DEGREE
June 2022
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:0+00
rzil
mil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
DISTANCES REFERENCED TO: N = 54373 FEET, E = 2184881 FEET, AZIMUTH = 172 DEGREE
-3
— June 2022
— December 2022
-350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:5+00
DISTANCES REFERENCED TO: N = 54307 FEET, E = 2184386 FEET, AZIMUTH = 172 DEGREE
— June 2022
— December 2022
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:10+00
DISTANCES REFERENCED TO: N = 54231 FEET, E = 2183814 FEET, AZIMUTH = 172 DEGREE
— June 2022
— December 2022
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:15+00
DISTANCES REFERENCED TO: N = 54175 FEET, E = 2183394 FEET, AZIMUTH = 172 DEGREE
— June 2022
— December 2022
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:20+00
DISTANCES REFERENCED TO: N = 54109 FEET, E = 2182898 FEET, AZIMUTH = 172 DEGREE
— June 2022
— December 2022
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

0XII
mil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:25+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 54043 FEET, E = 2182403 FEET, AZIMUTH = 172 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:30+00
DISTANCES REFERENCED TO: N = 53977 FEET, E = 2181908 FEET, AZIMUTH = 172 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:35+00
DISTANCES REFERENCED TO: N = 53768 FEET, E = 2181455 FEET, AZIMUTH = 154 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:40+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 53554 FEET, E = 2181003 FEET, AZIMUTH = 168 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

001
Wil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:45+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 53450 FEET, E = 2180514 FEET, AZIMUTH = 168 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:50+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 53345 FEET, E = 2180025 FEET, AZIMUTH = 168 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:55+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 53212 FEET, E = 2179543 FEET, AZIMUTH = 164 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
101
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:60+00
DISTANCES REFERENCED TO: N = 53075 FEET, E = 2179062 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:65+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 52926 FEET, E = 2178585 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:70+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 52777 FEET, E = 2178107 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:75+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 52629 FEET, E = 2177630 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
mil
00
00
> 0
z
w
w
LL
z
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:80+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 52480 FEET, E = 2177153 FEET, AZIMUTH = 162 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:85+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 52331 FEET, E = 2176675 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:90+00
DISTANCES REFERENCED TO: N = 52182 FEET, E = 2176198 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:95+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 52033 FEET, E = 2175721 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:100+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 51884 FEET, E = 2175243 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:105+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 51735 FEET, E = 2174766 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:110+00
DISTANCES REFERENCED TO: N = 51587 FEET, E = 2174289 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
101
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:115+00
DISTANCES REFERENCED TO: N = 51438 FEET, E = 2173811 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:120+00
DISTANCES REFERENCED TO: N = 51289 FEET, E = 2173334 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:125+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 51140 FEET, E = 2172857 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
00
00
> 0
z
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:130+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 50991 FEET, E = 2172379 FEET, AZIMUTH = 162 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
mil
00
00
> 0
z
w
w
LL
z
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:135+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 50842 FEET, E = 2171902 FEET, AZIMUTH = 162 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:140+00
DISTANCES REFERENCED TO: N 50693 FEET, E = 2171425 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XI
IM01
00
00
> 0
z
w
w
LL
z
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:145+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 50545 FEET, E = 2170947 FEET, AZIMUTH = 162 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:150+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 50397 FEET, E = 2170470 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:155+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 50248 FEET, E = 2169992 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
mil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:160+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 50100 FEET, E = 2169515 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

011
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:165+00
DISTANCES REFERENCED TO: N = 49951 FEET, E = 2169038 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
mil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:170+00
DISTANCES REFERENCED TO: N = 49802 FEET, E = 2168560 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
101
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:175+00
DISTANCES REFERENCED TO: N = 49653 FEET, E = 2168083 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:180+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 49505 FEET, E = 2167606 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:185+00
DISTANCES REFERENCED TO: N = 49356 FEET, E = 2167128 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
mil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:190+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 49207 FEET, E = 2166651 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:195+00
DISTANCES REFERENCED TO: N = 49057 FEET, E = 2166174 FEET, AZIMUTH = 162 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
101
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:200+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 48908 FEET, E = 2165697 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:205+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 48742 FEET, E = 2165225 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:210+00
DISTANCES REFERENCED TO: N = 48575 FEET, E = 2164754 FEET, AZIMUTH = 160 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
00
00
> 0
z
F-
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:215+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 48514 FEET, E = 2164259 FEET, AZIMUTH = 174 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:220+00
DISTANCES REFERENCED TO: N = 48464 FEET, E = 2163761 FEET, AZIMUTH = 174 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:225+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 48314 FEET, E = 2163287 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:230+00
DISTANCES REFERENCED TO: N = 48144 FEET, E = 2162816 FEET, AZIMUTH = 160 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:235+00
DISTANCES REFERENCED TO: N = 47974 FEET, E = 2162346 FEET, AZIMUTH = 160 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION : 240+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 47773 FEET, E = 2161888 FEET, AZIMUTH = 156 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:245+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 47573 FEET, E = 2161430 FEET, AZIMUTH = 156 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:250+00
0XII
101
00
00
> 0
Q
z
w
w
LL
z
O
-10
w
J
W
W11
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:255+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 47129 FEET, E = 2160536 FEET, AZIMUTH = 149 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
00
00
> 0
z
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:260+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 46874 FEET, E = 2160106 FEET, AZIMUTH = 149 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
00
00
> 0
z
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:265+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 46695 FEET, E = 2159641 FEET, AZIMUTH = 160 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

001
Wil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:270+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 46529 FEET, E = 2159169 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2022 Beach Monitoring
STATION:275+00
DISTANCES REFERENCED TO: N = 46333 FEET, E = 2158709 FEET, AZIMUTH = 156 DEGREE
— June 2022
— December 2022
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

APPENDIX B
COMPARATIVE BEACH PROFILE PLOTS FOR HOLDEN BEACH MONITORING
STATIONS

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
.o
-50�
Holden Beach, NC - 2022 Beach Monitoring
STATION:300+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 58000 FEET, E = 2200814 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:305+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57934 FEET, E = 2200319 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
.o
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:310+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57868 FEET, E = 2199824 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:315+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57802 FEET, E = 2199328 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
.o
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:320+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57723 FEET, E = 2198738 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:325+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57671 FEET, E = 2198337 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:330+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57608 FEET, E = 2197840 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:335+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57544 FEET, E = 2197345 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION : 340+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57462 FEET, E = 2196703 FEET, AZIMUTH = 171 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

till
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:345+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57410 FEET, E = 2196354 FEET, AZIMUTH = 171 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:350+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57336 FEET, E = 2195858 FEET, AZIMUTH = 171 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2022 Beach Monitoring
STATION:355+00
DISTANCES REFERENCED TO: N = 57262 FEET, E = 2195365 FEET, AZIMUTH = 171 DEGREE
— June 2022
— December 2022
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:360+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57206 FEET, E = 2194869 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:365+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 57088 FEET, E = 2194380 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2022 Beach Monitoring
STATION:370+00
DISTANCES REFERENCED TO: N = 56987 FEET, E = 2193891 FEET, AZIMUTH = 168 DEGREE
— June 2022
— December 2022
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
.o
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:375+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 56886 FEET, E = 2193401 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

till
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-40
-500
Holden Beach, NC - 2022 Beach Monitoring
STATION:380+00
DISTANCES REFERENCED TO: N = 56785 FEET, E = 2192910 FEET, AZIMUTH = 168 DEGREE
500 1000
1500 2000 2500
DISTANCE ALONG PROFILE (FEET)
— June 2022
— December 2022
3000 3500

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:385+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 56685 FEET, E = 2192422 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:390+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 56584 FEET, E = 2191931 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:395+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 56483 FEET, E = 2191442 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION A00+00
— June 2022
— December 2022
DISTANCES REFERENCED TO: N = 56372 FEET, E = 2190904 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION A03+00
June 2022
DISTANCES REFERENCED TO: N = 56386 FEET, E = 2190674 FEET, AZIMUTH = 183 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION A05+00
June 2022
DISTANCES REFERENCED TO: N = 56428 FEET, E = 2190547 FEET, AZIMUTH = 198 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION A07+00
June 2022
DISTANCES REFERENCED TO: N = 56499 FEET, E = 2190439 FEET, AZIMUTH = 213 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION : 411 + 00
June 2022
DISTANCES REFERENCED TO: N = 56592 FEET, E = 2190356 FEET, AZIMUTH = 228 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2022 Beach Monitoring
STATION:413+00
June 2022
DISTANCES REFERENCED TO: N = 56700 FEET, E = 2190302 FEET, AZIMUTH = 243 DEGREE
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION A16+00
June 2022
DISTANCES REFERENCED TO: N = 56815 FEET, E = 2190279 FEET, AZIMUTH = 258 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2022 Beach Monitoring
STATION:418+00
June 2022
DISTANCES REFERENCED TO: N = 56927 FEET, E = 2190285 FEET, AZIMUTH = 273 DEGREE
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION :421+00
June 2022
DISTANCES REFERENCED TO: N = 57030 FEET, E = 2190319 FEET, AZIMUTH = 288 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
� -10
z
O
Q
w -20
J
W
-30
.o
-50L
Holden Beach, NC - 2022 Beach Monitoring
STATION:425+00
June 2022
DISTANCES REFERENCED TO: N = 57118 FEET, E = 2190377 FEET, AZIMUTH = 303 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)