Several studies have been conducted on shoreline change in a lake. These studies described interesting characteristics, and are effective for understanding basic processes of sand movement, because the external forces acting on lake shoreline is relatively simplified compared with those on coastal shores. In addition, these studies are useful for investigating similarity law of coastal sediment, because the scale of topographical change and external forces are smaller in a lake than those encountered along seashore, but much larger than laboratory flume. In this study, the process of longshore sediment transport around the mouth of Nagase River and the Shidahama Beach, which is located to northeast of the Lake Inawashiro, is investigated based on aerial photographs and field measurement data.
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