THE EFFECT OF SHORE-PARALLEL OFFSHORE BREAKWATER ON THE BEACHES AT OCEAN CITY, NJ

J. Richard Weggel, Stewart C. Farrell

Abstract


The design, construction and performance of a shoreparallel nearshore breakwater at Ocean City, NJ (USA) are described. The breakwater, which is connected to a long, high, impermeable groin at 9th Street, was constructed from armor stone removed from the groin when the groin cross-section was lowered. Constructed over a two month period in late 1987 and early 1988, the breakwater caused accretion immediately behind it and erosion along downdrift beaches. A beach fill of 40,000 cu yd of sand was recommended as a part of the original project; however, the beachfill was not placed until the spring of 1990, more than two years after the breakwater/spur was constructed. The project, in the absence of the recommended beach fill, is performing as would be expected. The sand within the groin compartment has been redistributed with a net gain behind the breakwater just downdrift of the 9th street groin and a loss updrift of the groin at 11th street.

Keywords


Ocean City, NJ; breakwater; offshore breakwater; shore parallel breakwater

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