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Abstract

Beach changes in Kugami area of the Iwami coast in Tottori Prefecture were investigated through the comparison of bottom sounding data and field observation. This coast is a pocket beach of 2.2km length. On the west end of the beach, a breakwater of the Higashi fishing port was extended, resulting in the formation of wave calm zone behind the breakwater. Due to the wave sheltering effect of the breakwater, westward longshore sand transport was induced over the natural headland with a point depth of 3.5m in the middle of the pocket beach. Erosion and accretion were quantitatively analyzed.