1 / 12

Sediment Transport Modeling to Inform Dredged Material Management 20 April 2010

Sediment Transport Modeling to Inform Dredged Material Management 20 April 2010. Megan Kaun San Francisco District (415) 503-6909 megan.m.kaun@usace.army.mil. Building Strong on the Cornerstone of the Southwest. US Army Corps of Engineers BUILDING STRONG ® San Francisco District.

amity
Download Presentation

Sediment Transport Modeling to Inform Dredged Material Management 20 April 2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Sediment Transport Modeling toInform Dredged Material Management20 April 2010 Megan Kaun San Francisco District (415) 503-6909 megan.m.kaun@usace.army.mil Building Strong on the Cornerstone of the Southwest US Army Corps of Engineers BUILDING STRONG® San Francisco District

  2. Topics for Discussion • SF Bay Dredged Material Management Plan (DMMP) . • Information Gaps Important to USACE Dredging Program. • Recent USACE SF Bay Sediment Modeling. • USACE “White Paper” Model Evaluation. • Proposed Modeling Strategy for DMMP.

  3. S.F. Bay Dredged Material Management Plan (DMMP) • 20-year management plan for sediments dredged by USACE in SF Bay Region. • 11 Federal Channels • Includes O&M dredging & new work. • Tiered under LTMS program (40/40/20 plan). • Scheduled for 2012 completion. • Sediment modeling “White Paper” presents research options to program managers.

  4. USACE Dredging Program Information Gaps • Changes to navigational dredging requirements as a result of sea level rise and decreasing sediment load. • Increase in annual O&M dredging volumes as a result of new work & deepening projects. • Potential to use sediment as a resource.

  5. USACE SF Bay Sediment Modeling • Deep Water Ship Channels (SF Bay to Stockton and Sacramento) • UnTRIM (3D) • Hamilton Restoration Area, Aquatic Transfer Facility (ATF) • UnTRIM (3D) + Particle Tracking Model (FISH-PTM) • South Bay Shoreline • ADH (2D)

  6. Deep Water Ship Channels:SF Bay to Stockton &Sacramento3D UnTRIM • UnTRIM model used to estimate shoaling based on bottom shear stress in proposed ship channels. • With and without sea level rise conditions. UnTRIM Model Domain

  7. Hamilton Restoration Area, ATF3D UnTRIM + FISH-PTM • UnTRIM model used to calculate 3D velocity field for a given time interval. • Particle tracking (FISH-PTM) used to estimate fate of placed sediment. Predicted deposition patterns resulting from repeated dredged sediment placement (spring tides).

  8. South Bay Shoreline ADH (2D) Coarse Grid Boundary Conditions: (Tide and Surge) Fine Grid Wind (speed and direction)

  9. “White Paper” Model Evaluation • Prefer a Hydrodynamic + Wind Wave model + Sediment Transport (cohesive and non-cohesive) model that has/is: • 3D capabilities to represent “gravitational circulation”, • An unstructured grid to capture complex geometry/bathymetry, • Able to simulate hydraulic structures, • Well documented/tested and supported by scientific community, • Available to apply to SF Bay study area now to include results in 2012 DMMP. • Models considered include: ADH, CMS, DELFT3D, EFDC, MIKE3, UnTRIM, SUNTANS.

  10. Proposed Modeling Strategy, 2012 DMMP • Expand UnTRIM 3D Hydrodynamic model: • Integrate 3D Sediment Transport model (SediMorph). • Link to wind wave model (K-model/SWAN). • Calibrate & verify model: • Hydrodynamic model calibration will be refined, especially in the Central & South Bay. • Wind wave model will be calibrated using wave data. • Sediment transport model will be calibrated to (limited) sediment flux data.

  11. Proposed Modeling Strategy, 2012 DMMP (cont.) • Primary model application: • Identify and assess aquatic locations for potential beneficial use sites. • Proposed beneficial use sites will be screened by DMMP/LTMS team as areas for future pilot studies. • Secondary model application: • Approximate changes to USACE maintenance dredging needs over next 20 years (2035) at selected SF Bay federal navigation channels due to sea level rise and decreased sediment loads.

  12. Questions? • Megan Kaun • megan.m.kaun@usace.army.mil • (415) 503-6909 • Frank Wu • frank.wu@usace.army.mil • (415) 503-6902

More Related