Author(s): John B. Herbich

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Abstract: Offshore breakwaters are built to protect the shoreline from wave action,prevent beach erosion and replenish beach sand by interrupting longshore andwave-generated currents.When properly designed,an offshore breakwater willeither form a tombolo or a sand-spit,as desired. Formation of the sand-spitbegins soon after construction of the breakwater.Approximately 50 percent ofthe sand volume is deposited in the first year with a steady state beingreached after four(4)to five(5)years. After that time it will remainrelatively stable undergoing minor or moderate seasonal changes.The processof beach accretion may be accelerated by depositing sand on the shorelinebehind the breakwater employing pumping(dredging)or trucking methods.

DOI:

Year: 1989