抄録
Beach changes around the mouth of the Hino River flowing into Lake Biwa were investigated through the comparison of aerial photographs. In the past, a large river mouth delta developed at the mouth of the Hino River, but in recent years rapid shoreline recession occurred. Two causes of beach erosion were found. The first is the dredging of the river bed including the mouth, resulting in decrease in sediment supply from the river. The second is the water level control, in which water level of the lake is raised in winter to obtain water resource and this accelerated erosion by the combined effect of strong wind in winter.
