Abstract
Method controlling the diffusion of gravel in foreshore nourishment using short groins and small-scale detached breakwaters were investigated, taking into consideration the fact that the gravel movement concentrates on the foreshore. When beach material composed of mixed grain sizes is nourished on the foreshore, the discharge of the gravel component may be reduced when these structures are installed, while supplying fine sediment to downcoast. The mechanism was investigated using the contour-line-change model considering the change in grain size under the conditions beach nourishment is carried out on a dynamically equilibrium beach with a constant longshore sand transport.
