In the middle reach of Kamanashi River, riverbed has a tendency of aggregation. In this study, some development scenarios for maintaining the riverbed elevation in view of the sedimentation trends were examined. The riverbed variations were calculated by using a MIKE21C curvilinear model. First, by comparing calculated results with the actual riverbed variation obtained between 1998 and 2003, the model was calibrated and validated. In addition, plane properties of changes of flow during that period were explained. Next, by using the model, the future riverbed variations starting from 2004 onward under the flow conditions of the 20-year flood return period and under 2 different development scenarios were forecasted. The study result shows that the development scenario 1 where some well planned dredging works are undertaken would be more suitable for riverbed management of this reach.

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