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Title: Detached breakwaters for shore protection
Identifier: detachedbreakwat00dall (find matches)
Year: 1986 (1980s)
Authors: Dally, William R; Pope, Joan; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. )
Subjects: Breakwaters; Shore protection
Publisher: Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; (Springfield, Va. : Available from National Technical Information Service)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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dt* Figure 3. Breakwater and nearly symmetric tombolo (incident waves normal to shore), Tel-Aviv, Israel it is symmetrical and concave on either side. However, if a salient forms, it will have a more rounded, convex shape. The diffracted waves may not be exactly normal in the vicinity of the salient apex, but in this region forces resulting from the waves diffracted by each of the breakwater heads will be in balance. No longshore current will be driven, and the longshore transport is zero. 10. Waves that arrive at an oblique angle will generate a net longshore transport rate that is maintained some distance updrift and downdrift of the breakwater. The shoreline near the structure will tend to adjust so that the same transport rate is achieved everywhere and dynamic equilibrium is again attained. To do so, smaller waves behind the structure must transport as much sediment alongshore as the larger waves adjacent to the structure. This situ- ation will occur when the beach planform behind the breakwater has adjusted through the formation of a salient. The bathymetry of the salient causes the smaller, diffracted waves behind the structure to break at a more oblique angle than those waves outside the shelter of the structure. After tombolo 10

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