BEACH CHANGES ALONG NORTHERN COAST OF FUTTSU CUSPATE FORELAND AND EFFECT OF 2011 GREAT TSUNAMI

Abstract

 Beach changes along the north shore of the Futtsu cuspate foreland were investigated using aerial photographs and field observation. In this area, sand has been supplied from the south shore of the cuspate foreland, while turning around the Futtsu cuspate foreland, and longshore sand transport with the order of magnitude of 3500 m³/yr occurred in 1980 and 1990. Recently it gradually decreased up to the level of 1500 m³/yr. However, after the 2011 Great Tsunami rapid increase in longshore sand transport was measured owing to the effect of the tsunami.