Low-crested (LC) rubble mound breakwaters, whose crest level is at the still water level (SWL), represent an environmentally friendly method for shore protection. Numerical simulations of the flow field induced by wave overtopping over these structures were performed. Three different cases of breakwaters were examined with crest width equal to d, 2d and 3d, where d is the depth at the seaward toe of the structures. From the results, which include reflection and transmission coefficients and velocity and vorticity fields, it is revealed that the crest width affects the wave and flow behavior in the leeward side of LC breakwaters.
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