Abstract
Beach changes on the Hazaki coast extending between Kashima Port and Hazaki fishing port were investigated. Numerical simulation of beach changes and grain size changes were carried out, using the contour-line-change model considering the change in grain size (Kumada et al, 2005). In this area, fine sand is transported from outside to inside the wave shelter zone of the breakwater with the construction of Hazaki fishing port. Furthermore, 10.6×104 m3/yr of sand has been supplied from the Tone River and part of fine sand deposited inside the port. The mechanism of deposition of fine sand in the fishing port was well explained by the present model.
