sediment transport modeling to inform dredged material management 20 april 2010 l.
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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.

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sediment transport modeling to inform dredged material management 20 april 2010

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

topics for discussion
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.
s f bay dredged material management plan dmmp
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.
usace dredging program information gaps
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.
usace sf bay sediment modeling
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)
deep water ship channels sf bay to stockton sacramento 3d untrim
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

hamilton restoration area atf 3d untrim fish ptm
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).

south bay shoreline
South Bay Shoreline

ADH (2D)

Coarse Grid

Boundary Conditions:

(Tide and Surge)

Fine Grid

Wind

(speed and direction)

white paper model evaluation
“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.
proposed modeling strategy 2012 dmmp
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.
proposed modeling strategy 2012 dmmp cont
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.
questions
Questions?
  • Megan Kaun
  • megan.m.kaun@usace.army.mil
  • (415) 503-6909
  • Frank Wu
  • frank.wu@usace.army.mil
  • (415) 503-6902