HR: 0800h
AN: H41B-0510    [Abstracts]
TI: Coastal Morphodynamic Response of a Shallow Sediment Mound Forced by Strong Tidal Currents and Large Waves
AU: * Erikson, L H
EM: lerikson@usgs.gov
AF: United States Geologic Survey, 400 Natural Bridges, Santa Cruz, CA 95060, United States
AU: Barnard, P L
EM: pbarnard@usgs.gov
AF: United States Geologic Survey, 400 Natural Bridges, Santa Cruz, CA 95060, United States
AU: Elias, E
EM: eelias@usgs.gov
AF: WL/Delft Hydraulics, 2600 MH Delft, Delft, 00000, Netherlands
AU: Hanes, D M
EM: dhanes@usgs.gov
AF: United States Geologic Survey, 400 Natural Bridges, Santa Cruz, CA 95060, United States
AU: Mull, P
EM: peter.mull@usace.army.mil
AF: United States Army Corps of Engineers, 333 Market St., San Francisco, CA 94105, United States
AB: Shoreline erosion along Ocean Beach, located south of the Golden Gate inlet, is an imminent problem threatening viable infrastructure. In an effort to reduce the erosion, dredged material has been placed within the nearshore region immediately offshore of the erosion ‘hot-spot' during three annual operations. As part of an effort to understand the physical processes causing morphologic evolution in the inner shelf and nearshore regions, a numerical model simulating tidal currents and transformation of waves from offshore to the nearshore region has been hydrodynamically calibrated and validated with field data. The numerical model is used to investigate nearshore morphodynamics including the development of bars, displacement of material locally introduced to the system, and movement of the inferred mean shoreline position on seasonal and inter-annual time-scales. The feedback between longer term (decadal) shoreline changes in response to regularly scheduled placement of sediment and the response to varying offshore wave conditions are also investigated.
DE: 1824 Geomorphology: general (1625)
DE: 1847 Modeling
DE: 4534 Hydrodynamic modeling
DE: 4560 Surface waves and tides (1222)
SC: Hydrology [H]
MN: 2007 Fall Meeting