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Simulating Dredging and Sediment Feedbacks with HEC-RAS

Simulating Dredging and Sediment Feedbacks with HEC-RAS. Stanford Gibson, PhD Hydrologic Engineering Center USACE. Road Map. Importance of Sediment Feedbacks on Dredged Channels Overview of HEC-RAS Two Examples of Navigation Dredging Simulations New Dredging Capabilities in HEC-RAS 4.2.

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Simulating Dredging and Sediment Feedbacks with HEC-RAS

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  1. Simulating Dredging and Sediment Feedbacks with HEC-RAS Stanford Gibson, PhD Hydrologic Engineering Center USACE

  2. Road Map • Importance of Sediment Feedbacks on Dredged Channels • Overview of HEC-RAS • Two Examples of Navigation Dredging Simulations • New Dredging Capabilities in HEC-RAS 4.2

  3. Importance of Modeling Feedbacks on Sediment Systems Sediment Deposition Channel Geometry Change Dredging

  4. ~ ~

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  6. HEC-RAS Sediment Transport • Mobile Boundary Hydraulic Model • Captures Sediment-Hydraulic Feedbacks • Cohesive and Cohesionless Transport • Public Domain - 1D Model – Widely Applied • There is probably already an HEC-RAS hydraulic model of your system • Good at Depositional Sediment Modeling • Dredging Capabilities

  7. Ontonagon River Cuyahoga River

  8. Ontonagon River Model and Calibration by Calvin Creech of LRD

  9. Cuyahoga River 3 things

  10. Classic Dredging Capabilities • HEC-RAS 4.1 followed HEC 6 • Allow user definition of time and extent of dredging configuration. • left/right extent and elevation for each XS • Only rectangular dredging cuts. • Instantaneous Dredging

  11. Dredging Editor

  12. New Dredge Options in Version 4.2

  13. Time Integrated Dredging

  14. Missouri River Through Kansas City

  15. Modeling Residual Sediment Suspension

  16. Modeling Residual Sediment Suspension

  17. Automated Dredging Triggers

  18. Bed Layers z z Gradations can then be “layered” Dx Dx Dx Dx Dx Dx Resistant Reservoir Layer Lacustrian Glacial Strata Glacial Outwash Strata Erodibility=f(Density) Density=f(Depth)

  19. Stanford Gibson: stanford.gibson@usace.army.mil HEC-RAS: www.hec.usace.army.mil Collaborators: The RAS Team: Gary Brunner, Mark Jensen, Steve Piper, Cameron Ackerman District Partners: John Shelley NWK, Calvin Creech LRD

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