A numerical model investigation of the formation and persistence of an erosion hotspot
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Abstract
A Delft3D-SWAN coupled flow and wave model was constructed for the San Francisco Bight with high-resolution at 7 km-long Ocean Beach, a high-energy beach located immediately south of the Golden Gate, the sole entrance to San Francisco Bay. The model was used to investigate tidal and wave-induced flows, basic forcing terms, and potential sediment transport in an area in the southern portion of Ocean Beach that has eroded significantly over the last several decades. The model predicted flow patterns that were favorable for sediment removal from the area and net erosion from the surf-zone. Analysis of the forcing terms driving surf-zone flows revealed that wave refraction over an exposed wastewater outfall pipe between the 12 and 15 m isobaths introduces a perturbation in the wave field that results in erosion-causing flows. Modeled erosion agreed well with five years of topographic survey data from the area.
Study Area
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | A numerical model investigation of the formation and persistence of an erosion hotspot |
| DOI | 10.1142/9789814355537_0134 |
| Year Published | 2011 |
| Language | English |
| Publisher | World Scientific |
| Contributing office(s) | Pacific Coastal and Marine Science Center |
| Description | 14 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | The proceedings of the Coastal Sediments 2011 |
| First page | 1769 |
| Last page | 1782 |
| Conference Title | 7th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes |
| Conference Location | Miami, Florida, United States |
| Conference Date | May 2-6, 2011 |
| Country | United States |
| State | California |
| City | San Francisco |
| Other Geospatial | Ocean Beach |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |