Abstract
Beach has been severely eroded on Akaehama Beach extending between the Oyodo River mouth and Aoshima Island with a stretch of approximately 11 km in Miyazaki Prefecture. To investigate the cause, aerial photographs were compared and shoreline changes were obtained. Past condition of erosion with the formation of scarp during Typhoon No. 16 in August 2004 was shown. Furthermore, topographic changes around the Oyodo River mouth were investigated based on the records of dredging.