抄録
The Sakawa River flowing into Sagami Bay has supplied rich sediment to the Seisho coast because of steep river. Sediment supply, however, has been reduced by river bed mining before 1967 and the construction of a dam in the upper basin. Since then, beach was eroded with a significant shoreline recession around the river mouth. In this study, an expected fluvial sand supply for reforming a river mouth delta of the Sakawa River with a steep bed slope was investigated, using the contour-line-change model considering grain size changes. It was found that the expected sand supply from the river necessary for recovering the river delta within 30 years from the present was 1.5x105 m3/yr.
