安積疎水取水口における土砂堆積と周辺湖浜の漂砂環境との関連

概要

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Investigations on shoreline change in a lake are useful for understanding similarity law of coastal sedimentation processes, because the scale of topographical change and external forces are smaller in a lake than those encountered along seashore, but sufficiently bigger than those in a laboratory flume. In this study, long-term shoreline change around the mouth of the Nagase River in Lake Inawashiro, Japan is investigated by analyzing topographical maps as well as aerial photographs. The main conclusion of the present study is that the sediment supplied from the Nagase River moves in the eastern direction, because the seasonal wind in winter from northwest direction causes strong waves propagating in the eastern direction with highly oblique incident angle to the shoreline, resulting in considerable longshore sediment movement to the east. Sediment deposit in an intake pond of the Asaka Channel can be attributed to the longshore sediment movement from the Nagase River mouth.
2004-02-29