The URL can be used to link to this page

Home My WebLink AboutProcess-based Modeling and Measurement of Streambank Retreat in a NC Piedmont StreamRussell_Ecostream 2108-GS-EEPQ99JM2Department of Environmental Quality Division of Mitigation Services (DMS) Periann RussellMelonie AllenCasey Haywood Process-based Modeling and Measurement of Streambank Retreat in a NC Piedmont Stream EcoStream 2018 North Carolina State University, Bio and Ag Engineering Dr. Celso Castro-Bolinaga Kayla Kassa Dr. Lucie Guertault Acknowledgement: Jonathon Page NCSU Department of Environmental Quality EcoStream 2018 Bank Retreat: Consistent Questions Related to Restoration Projects Pre and post construction Why? How much? Local or Systemic? Long-term or Short-term Effect? Need to understand Department of Environmental Quality EcoStream 2018 Bank Stability and Toe Erosion Model (BSTEM) Process-Based Fluvial and Geotechnical Physical properties of streambank Considers variable GW and surface flows over time Quantifies area and volume Reckendorf & Associates 2006 Department of Environmental Quality EcoStream 2018 Test the effectiveness of the processed-based BSTEM in predicting erosion rates Expand modeling efforts to account for bank erosion and sediment transport processes Ultimate Goal: Calibrate and regionalize BSTEM for ease of application in the NC Piedmont Department of Environmental Quality EcoStream 2018 Test Site and Methods •Completed 5 3D terrestrial laser scans from Oct 2017 –July 2018 1 base, 4 at least .66Qe •Estimated erosion and deposition •Modeled bank retreat –BSTEM (static) Jet Erosion Test (JET) to measure τc and K for each bank Soil samples -moisture content, bulk density Compared measured to modeled Richland Creek Wake Forest, NC Sand Bed Stream 2900 feet restoration EcoStream 2018 Richland Creek Bank 3 May 2017 May 2018 Richland Creek Bank 3 Scan 1 –Scan 5 Water level Erosion = 0.3 m3 Deposition = 2.0 m3 EcoStream 2018 Richland Creek Bank 4 August 2018 Department of Environmental Quality October 2017 EcoStream 2018 Richland Creek Bank 4 Scan 1 –Scan 5 Water level Scour Hole Department of Environmental Quality Erosion = 1.5 m3 Deposition = 1.0 m3 EcoStream 2018 Stage (ft)Factor of Safety Stability Bank 3 2.3 (.66Qe)0.35 Unstable Bank 4 2.8 (.66Qe)0.13 Unstable •Expand research sites •Measure additional τc and K bank sites •Model Richland Creek as-built geometry Dynamic BSTEM -1D HEC-RAS + BSTEM –1D Sedimentation and River Hydraulics (SHR-2D) •Understand the limitations of the different models •Develop tools for general use Next Steps… •Build knowledge and understanding about bank erosion processes •Potential for accurate existing condition assessments to inform need •Set baseline for functional framework •Set restoration/mitigation expectations and describe uncertainty analysis We hope to... https://deq.nc.gov/about/divisions/mitigation-services/dms-science-data Department of Environmental Quality EcoStream 2018 Klavon K, Fox G, Guertault L, Langendoen E, Enlow H, Miller R, Khanal A. 2017. Evaluating a process-based model for use in streambank stabilization: insights on the Bank Stability and Toe Erosion Model (BSTEM). Earth Surface Processes and Landforms 42, 191-213. Thorne, C. R. 1978. Processes of bank erosion in river channels. Doctoral dissertation. Univ. East Anglia, UK. Simon A, Pollen-Bankhead N, Thomas RE. 2011. Development and application of a deterministic bank stability and toe erosion model for stream restoration. In Stream Restoration in Dynamic Fluvial Systems, Simon A, Bennett SJ, Castro JM (eds). American Geophysical Union: Washington, DC. DOI. 10.1029/2010GM001006 Hanson, G. J., and Cook, K. R. (2004). "Apparatus, test procedures, and analytical methods to measure soil erodibility in situ." Applied Engineering in Agriculture, 20(4), 455-462. Lai YG, Fox G, Thomas RE, Ozeren Y, Simon A, Greimann BP, Wu K. 2012. Coupling a Two-Dimensional Model with a Deterministic Bank Stability Model. Water Environmental and Water Resources Congress 2012.