Abstract
The closure mechanism of the mouth of a floodway owing to the deposition of gravel by waves was investigated, taking the Shin-nakagawa floodway flowing into the Fuji coast as an example. A movable bed experiment with a model scale of 1/50 using a two-dimensional wave channel was carried out, while changing the discharge of the floodway. It was found that the berm height and foreshore slope were reduced owing to the filtration flow on the gravel beach. A model for predicting beach changes with filtration flow based on the contour-line-change model was proposed. The effect of the filtration flow on the cross-shore sand transport was incorporated in the model, and the calculation results were in good agreement with the experimental results.References
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