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Propwash Modeling for Contaminated Sediment Cap Design and Beyond

Propwash Modeling for Contaminated Sediment Cap Design and Beyond. Vladimir Shepsis, PhD, PE, Coast & Harbor Engineering, Inc Tom Wang, PE, Anchor Environmental, QEA November 06, 2009. Cap of contaminated sediment. Bottom and shoreline scour. Under pier slope protection. Eelgrass impact.

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Propwash Modeling for Contaminated Sediment Cap Design and Beyond

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  1. Propwash Modeling for Contaminated Sediment Cap Design and Beyond Vladimir Shepsis, PhD, PE, Coast & Harbor Engineering, Inc Tom Wang, PE, Anchor Environmental, QEA November 06, 2009

  2. Cap of contaminated sediment Bottom and shoreline scour Under pier slope protection Eelgrass impact Other

  3. = Velocity at coordinate x and z (coordinates relative to propeller center) = Jet velocity exiting propeller (1949 ) Vx = Empirical coefficient

  4. Updated: June 8, 2007

  5. = Velocity at coordinate x and z (coordinates relative to propeller center) = Jet velocity exiting propeller Vx = Empirical coefficient

  6. Steady Propwash – 2-Dimensional JETWASH Model Velocity (feet/sec) Star "O" Class Distance propeller (feet)

  7. Tractor Tug Garth Foss, Whatcom Waterway, Port of Bellingham Steady Propwash – 2-Dimensional JETWASH Model Velocity (ft/s) Depth (ft) Distance from Propellers (ft)

  8. JETWASH Model and measured velocities in Kingston Field Test JETWASH Model and measured velocities in Vashon Field Test

  9. Propwash Modeling Results

  10. Unsteady 3-Dimensional Model VH-PU, Plan view of bottom velocities Bottom

  11. Unsteady 3-Dimensional Model VH-PU, Cross sectional view of bottom velocities Section View of Velocities at Propeller Axis

  12. VH-PU Model Verification with Lab DataExperimental Setup Schokking (2002)

  13. CHE Model Verification with Lab DataVerification Results

  14. CHE Model Verification with Field DataField Test Setup

  15. CHE Model Verification with Field Data Test 1 t = 5 sec t = 7 sec t = 9 sec

  16. CHE Model Verification with Field Data Test 2 t = 1 sec t = 3 sec t = 5 sec

  17. Capping Design, Lockheed Shipyard Project

  18. Lockheed Shipyard ProjectSite Photos

  19. Application to Environmental Impact Analysis Eelgrass Impacts Plan View of Bottom Velocity during Ferry Landing

  20. Application to Environmental Impact Analysis Eelgrass Impacts Plan View of Bottom Velocity during Ferry Landing Vessel is not moving

  21. Updated: June 8, 2007

  22. Bottom Velocity From Moving Boat Stationary Vessel Moving Vessel

  23. 3-Dimensional VH-PU Coupled with FLOW 3D Stationary Cruiser Moving Cruiser

  24. 3-Dimensional VH-PU Coupled with FLOW 3D Stationary Cruiser Moving Cruiser

  25. Relative Bottom Velocity 1.2” 1.9” Moving Vessel 1.1”

  26. Remedial Design Elements 9 ASB 5B 5A 2B 5C 2A 3B 3A 1C 2C 4 Log Pond 6C 7

  27. 38-ft Sea Ray 66-ft Motor Yacht

  28. Summary • Propwash hydrodynamics and induced bottom sediment mobility physical processes are extremely complex and can not be accurately simulated, even with the most advanced computer software (models) available today. • When designing a contaminated sediment cap or other responsible project effected by propwash, the Design Engineer should be thoughtful in his/her selection of modeling tools and methodologies. Rational decision on selection of the modeling tool would significantly reduce construction cost and provide sustainable environmental solution.

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