On the basis of the concept given by Noshi
et al.(2005), a contour-line change model considering longitudinal slope corresponding to the grain size composition was developed, while improving the model given by Kumada et al.(2005). It is assumed that the equilibrium slope changes in response to the change in composition of grain size of bed materials, but the change is slow, and it gradually approaches an equilibrium slope with time. The model was applied to three coasts, and the applicability was confirmed. Longshore changes in foreshore slope, which was difficult to predict in the previous model, were able to predict in the model. Furthermore, the formation of the concave and convex profiles in the eroded and accreted zones became capable to predict.
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