Marsh Erosion by Wave Action

by Tim Abbe, Philip Williams & Associates Ltd, San Francisco, United States,
Peter Goodwin, Philip Williams & Associates Ltd, San Francisco, United States,
Philip Williams, Philip Williams & Associates Ltd, San Francisco, United States,



Document Type: Proceeding Paper

Part of: Coastal Zone '91

Abstract: This paper summarizes an analysis of salt marsh shoreline erosion, wind velocities and wave energy in Corte Madera Bay during an abnormally calm period in 1989. Winds during the study period of June through December ranged from 40-100% of the long-term mean monthly values. The shoreline at the salt marsh has been retreating at a rate of 0.76 meters annually since 1853. During the study period wind generated waves accounted for about 80 percent of the erosive energy with vessel waves accounting for the remaining energy. Storms were the principal source of erosive wind wave energy, but only one storm occurred during the initial portion of the study. The study will continue through 1991-1992 and the results presented are preliminary.

Subject Headings: Erosion | Wind power | Wind waves | Wave action | Shoreline | Wave generation | Wave velocity | Hydro power | Salts | North America | California | United States

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