Abstract
Shoreline changes on north Kujukuri Beach and beach changes around Iioka fishing port were investigated using aerial photographs and bathymetric survey data. The sand transport rate turing around the tip of the Iioka fishing port breakwater from Byobugaura sea cliffs was estimated to be 6.2×104m3/yr between 1980 and 1990. It has reduced 1.3×104m3/yr between 1990 and 2009. The former value was in good agreement with the rate of the deposition of 6.2×104m3/yr on the Shimonagai and Yokone coasts located in the wave-shelter zone of the Iioka fishing port breakwater. Thus, all sand supply from the Byobugaura sea cliffs is assumed to deposit on the Shimonagai and Yokone coasts, resulting in the exhaustion of sand supply to downcoast.
