Prediction of Bathymetric Changes of Hamaju Coast in Fukui Prefecture and Effect of Beach Nourishment

Abstract

On the Hamaju coast in Fukui Prefecture, beach changes were triggered by large-scale land reclamation and the construction of port breakwater due to their wave sheltering effect. Bathymetric changes were investigated using the past aerial photographs and bathymetric survey data. The effect of beach nourishment using beach materials composed of various grain sizes was predicted by the contour-line-change model considering grain size change, as a soft measure against beach erosion. It is concluded that beach nourishment using coarse sand deposited offshore of the Kuzuryu River is most effective.