FORSHORE EROSION OF KASHIMA COAST BY 2006 AUTUMN STORMS AND IT'S ALONGSHORE DYNAMICS

Strong low-pressure systems traveled along Japanese Main Island in October 2006. High waves and storm surge attacked Kashima Coast resulting huge erosion over the area. The extent of the study area is 38 km long for the northern Kashima Coast and 15 km long for the southern Kashima Coast. This study analyzed the foreshore erosion caused by the storms using airborne laser data measured in October 2005 and November 2006. The results are compared with the distributions of longshore component of wave power and wave run-up which estimated using SWAN wave model. The results indicate that the amount of erosion and its distribution are in agreement with the longhsore component of the wave power along the coast and the most of the high wave run-up values appear within the high eroded sections. These were especially prominent at the untreated sections, which should be close to the natural response by wave action.