Modeling study of Dana Point Harbor, California: littoral sediment transport around a semi-permeable breakwater

Autor: Honghai Li, Lihwa Lin, Chia-Chi Lu, Christopher W. Reed, Arthur T. Shak
Rok vydání: 2015
Předmět:
Zdroj: Journal of Ocean Engineering and Marine Energy. 1:181-192
ISSN: 2198-6452
2198-6444
DOI: 10.1007/s40722-015-0018-2
Popis: Dana Point Harbor is located on the southern California coast, midway between Los Angeles and San Diego. The harbor is protected by dual semi-permeable breakwaters, the East and the West Breakwaters. The permeability of the breakwaters has been designed to promote circulation and improve water quality in the harbor. However, wave and flow actions have increased sediment movement around the West Breakwater and resulted in harbor channel infilling in recent years. To investigate the sediment transport around the porous breakwater and reduce potential dredging cost in the future, an integrated coastal wave, hydrodynamic and sediment transport numerical model was used to investigate the effect of the permeability of breakwater. First, the model was validated with the field measurements of waves, current, and water surface elevation at two ADCP gages located on the harbor side and the ocean side of the West Breakwater. Further validation in the model’s capability to simulate wave flow through a porous structure was also performed with a laboratory experiment of low-crested structures under regular waves. Wave transmission, flow and sediment around the West Breakwater were calculated for 1-year period of 2009–2010. The calculated annual sediment rate in the inner side of breakwater was comparable to the sediment accumulation rate available from historical dredging records.
Databáze: OpenAIRE
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