Littoral cells and harbor dredging along the California coast |
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| Authors: | Gary B Griggs |
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| Institution: | (1) Board of Earth Sciences and Marine Sciences Institute, University of California at Santa Cruz, 95064 Santa Cruz, California |
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| Abstract: | Beach compartments or littoral cells form the framework for our understanding of the sources, transport, and sinks of sand
in the nearshore zone. In general, along the California coast, beach sand is derived from rivers or clifferosion, moves alongshore
under the influence of the prevailing waver conditions, and ultimately is lost either to a submarine canyon or a dune field.
Marinas or harbors built either between or at the upcoast ends of beach compartments have been relatively maintenance-free,
because of a lack of significant littoral drift at these locations. On the other hand, those harbors built in the middle reaches
or at the downcoast ends of littoral cells have had expensive annual dredging problems, because of the interruption of large
volumes of littoral drift. Although engineers have labored for years on various breakwater, jetty, or entrance channel configurations,
the actual design utilized is of secondary importance. The critical factors are harbor location within a littoral cell and
annual litoral drift volume. |
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