Beach and Structure Interactions
On the Shonan coast facing the Sagami Bay, part of nourishment sand was believed to be transported offshore, devaluing the effect of beach nourishment. Beach changes were investigated using the Narrow Multi-Beam survey data taken since 2002. It was concluded that the effect of the beach nourishment to the deposition of sediment offshore of the fishing port was minimal, and from the analysis of grain size composition that none of the nourishment sand composed of coarse material was transported offshore. Fine material in the offshore zone was brought from the erosion of the river mouth terrace.