A model for predicting not only the three-dimensional topographic changes, but also the planar changes in grain size distribution was developed on the basis of the contour line change model. In the past model, predicting the sorting of grain sizes due to longshore sand transport was difficult, but in this study, an equilibrium slope for each grain size population is introduced, and the sorting of grain sizes due to longshore and cross-shore sand transport can be predicted. The model was applied to the prediction of beach changes around Shimobara fishing port and the applicability of the model was confirmed.
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