Abstract
Directional characteristics of wave-induced residual current and control of littoral sand drift depending on wave direction and an angle of plural asymmetrical bottom roughness (we call the asymmetrical bottom roughness BaNK block) were experimentally investigated. Firstly, the distribution of residual velocity on the fixed bed with the bended BaNK blocks was measured in a 3-dimensional wave field. Secondly, the deformation of movable bed due to the effect of blocks was measured in other fields. As a result, direction of wave-induced residual current could be arbitrarily changed by setting blocks with an angle. Furthermore, it was dmonstrated that the BaNK blocks are able to control littoral sand drift in a 3-dimensional wave field with movable bed.
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