Abstract
Field measurements were carried out on two beaches composed of mixed sand and gravel to investigate the spatial distributions of bed material and topography change. Numerical simulation was also done to reproduce the measured responses of beach profile. A so-called SBEACH model was extended to simulate sorting process of the bed materials in the cross-shore direction due to difference in transport direction between fine and coarse materials and topography change. In the beach, equilibrium profile was divided by the bottom slope. Each part was composed of bed materials with different grain size. The measured and simulated profiles were in good agreement. Sorting processes and topography change measured in both beaches can be roughly reproduced by the proposed extended SBEACH model.
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