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Megan KaunSan Francisco District(415) [email protected]
US Army Corps of Engineers
BUILDING STRONG®
San Francisco District
Sediment Transport Modeling toInform Dredged Material Management
20 April 2010
BUILDING STRONG®As of 18-Aug-09 2
US Army Corps of EngineersSan Francisco District
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.
BUILDING STRONG®As of 18-Aug-09 3
US Army Corps of EngineersSan Francisco District
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.
BUILDING STRONG®As of 18-Aug-09 4
US Army Corps of EngineersSan Francisco District
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.
BUILDING STRONG®As of 18-Aug-09 5
US Army Corps of EngineersSan Francisco District
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)
BUILDING STRONG®As of 18-Aug-09 6
US Army Corps of EngineersSan Francisco District
Deep Water Ship Channels:SF Bay to Stockton &Sacramento
3D 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
BUILDING STRONG®As of 18-Aug-09 7
US Army Corps of EngineersSan Francisco District
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).
BUILDING STRONG®As of 18-Aug-09 8
US Army Corps of EngineersSan Francisco District
South Bay ShorelineADH (2D)
Boundary Conditions:(Tide and Surge)
Wind (speed and direction)
Coarse Grid
Fine Grid
BUILDING STRONG®As of 18-Aug-09 9
US Army Corps of EngineersSan Francisco District
“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.
BUILDING STRONG®As of 18-Aug-09 10
US Army Corps of EngineersSan Francisco District
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.
BUILDING STRONG®As of 18-Aug-09 11
US Army Corps of EngineersSan Francisco District
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.
BUILDING STRONG®As of 18-Aug-09 12
US Army Corps of EngineersSan Francisco District
Questions?
Megan [email protected](415) 503-6909
Frank Wu
(415) 503-6902
