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BSTEM Analysis of Arroyo de la Laguna for StreamWISE Program

This article discusses the BSTEM analysis conducted on Arroyo de la Laguna as part of the StreamWISE program. It explores the initial geomorphic investigation, BSTEM modeling, and potential project areas. It also presents the results of the analysis, including estimates of parameters and potential treatments for bed and bank problems.

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BSTEM Analysis of Arroyo de la Laguna for StreamWISE Program

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  1. Bank Stability and Toe Erosion Model (BSTEM) Analysis ofArroyo de la LagunaAssociated with Zone 7’s StreamWISE Program Virginia Mahacek Valley & Mountain Consulting for West Yost Associates Alameda Creek Watershed Sediment Forum April 23, 2008

  2. Introduction • Study Context • StreamWISE program • Initial Geomorphic Investigation • Spring 2007 • Preliminary Concepts • Summer 2007 • BSTEM Modeling and Refinement • Fall 2007 • Potential ADLL Project Areas

  3. Approach • Representative Sites on ADLL • Initial Investigation Results • Existing Geomorphic Conditions • Estimates of Parameters • Future Stormwater Flows • Hydrographs with COL (provided by WYA) • Alternative Treatments • BSTEM Scenarios

  4. Conceptual Projects Bed and Bank Problems • Locations • Treatment Types • Bed Incision • Toe Erosion • Bank Failures • Debris Jams

  5. BSTEM Sites

  6. River Station 47115 Left (East) Bank • Clear Lake clay soils • Holocene basin deposits

  7. River Station 42069 Left (East) Bank • Sycamore silt loam • Holocene stream terrace • Latest Holocene alluvial fan

  8. River Station 35895 Right (West) Bank • Zamora silt loam • Holocene stream terrace • Early Quaternary or older bedrock

  9. River Station 32424 Left (East) Bank • Yolo Loam • Latest Holocene stream terrace

  10. River Station 29893 Right (West) Bank • Yolo loam • Holocene stream terrace

  11. River Station 22845 Left (East) Bank • Yolo loam • Latest Holocene stream terrace

  12. BSTEM Version 4.1 • Quantitative, predictive tests of… • Hydraulic Scour • Geotechnical Failure • Surface water • Water-table • Vegetation • Bank height • Bank composition • Bank angle Layer 1 Layer 2 http://www.ars.usda.gov Layer 3 Toe material NationalSedimentationLaboratory

  13. Model Inputs • Topography/Geometry • Stratigraphy • Bed and Bank Materials • Groundwater • Vegetation • Hydrograph Duration • Water Stage

  14. Modeled Treatments

  15. Model Output • Toe Erosion • occurrences • retreat distances • eroded volumes • Bank Failure • occurrences • eroded volumes • peak or drawdown conditions

  16. Initial Geomorphic Inventory + BSTEM Modeling = Potential Project Areas to be considered by StreamWISE Potential ADLL Project Areas

  17. Questions?

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