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|Title:||San Francisco Bay : modeling system for dredged material disposal and hydraulic transport|
|Authors:||United States. Army. Corps of Engineers. San Francisco District.|
Pankow, Virginia R.
|Keywords:||Dredged material disposal|
Dredged material management
San Francisco Bay
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-88-27.|
Abstract: A combination of physical and numerical models was used to simulate the hydrodynamic, circulation, and sediment transport characteristics of San Francisco and San Pablo bays, This simulation was done in response to a request by the US Army Engineer District, San Francisco, to develop a modeling tool that can define the fate of dredged material disposed at the Alcatraz disposal site. Tide and current velocity data from the San Francisco Bay-Delta physical model were used to verify the vertically averaged hydrodynamic model, RMA-2V (Two-Dimensional Model for Free Surface Flows). This model was used to generate the velocity field for a dredged material disposal model, DIFTD (Discharge from an Instantaneous Dump). The suspended sediment concentrations from DIFID and the geometry and hydrodynamic data from RNA-ZV were used in the sediment transport model, STUDB (Sediment Transport in Unsteady Two-Dimensional Flows, Horizontal Plane), to establish sediment transport and dispersion patterns around the Alcatraz disposal site in central San Francisco Bay. Two model meshes were developed for this study: a comprehensive or global mesh of the entire system, and a more detailed inset mesh of the Alcatraz disposal area. The modeling system has its capabilities and applications. However, the results are just reasonable simulations, not fully verified ones. Each of the numerical models, RMA-ZV, DIFID, and STUDH, has individual capabilities and limitations, the greatest of which is the two-dimensional approximation of a three-dimensional phenomenon. The vertically averaged velocities and sediment fields will mask two-layer flow and other three-dimensional processes. Even with this simplification, the model results are useful in estimating the short- and long-term fates of sediments released during a disposal operation. Appendix A describes the TABS-2 modeling system in which RMA-2V and STUDH belong, and Appendix B gives details of the numerical model DIFID.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|