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Sandbars in the Agano river have seasonal change, such as decay in summer and regrowth in winter basically. In this study, regrowth of the sandbars are simulated with numerical code of interactions among waves, river flows, littoral drift and bathymetrical changes. Multi-directional irregular waves are used for incident wave condition for the purpose of consistency of natural condition. Terrain model was obtained by convert of Agano river mouth bathymetric image to DEM(Digital Elevation Model)doi:10.2208/kaigan.67.i_561 fatcat:k7gvbefifzdkhomto452l6rfvy