A model for predicting bathymetric and grain size changes considering equilibrium slopes corresponding to the composition of grain size and each grain size was incorporated with the BG model proposed by Serizawa et al. (2006). The model was applied to the beach changes on Kemigawa Beach. The cross-shore sorting of sand, in which the grain size gradually decreases with increasing depth, and the formation of a gradually changing longitudinal slope were reproduced well. The model was further applied to predict sand accumulation in the navigation channel and their impact to the nearby coast.
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