Beach Changes of Northern Shimizu Coast since 2006

Abstract

Beach changes of the northern Shimizu coast were investigated on the basis of the bathymetric survey data collected since 2006 between the artificial headland No. 4 south of L-shaped groin and transect No. 1 crossing Shimizu Port breakwater. Maximum longshore sand transport of 6.2×10⁴m³/yr was measured at a location of X=1.5 km of the coast. Because of the steep slope, all these sand transports were found to be discharged offshore with the rate of 6.2×10⁴m³/yr between 1998 and 2002, 6.6×10⁴m³/yr between 2002 and 2006 and 4.2×10⁴m³/yr between 2006 and 2009. Offshore sand loss also occurred in an area between X=0 and 0.3 km behind the Shimizu Port breakwater.