浅海平坦面上に発達するBay barrierの形成予測モデル

概要

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The formative mechanism of a bay barrier was investigated using a movable bed experiment. In the previous experimental study, whether or not a barrier is formed on a flat shallow bottom under the condition that a sufficient volume of sand is supplied by longshore sand transport was investigated. A barrier was formed in the experiment under the condition that the ratio of water depth of flat shallow bottom relative to wave height γ is smaller than 1.0, and not when γ is larger than 2.3. In the present study, topographic changes were calculated using the BG-model, which was proposed by Serizawa et al. (2009) and named after Bagnold's study. Results were in good agreement with the experimental data. It was confirmed that the formation of a bay barrier was mainly controlled by the occurrence of wave breaking on the flat shallow bottom, where a bay barrier extends.
2010-01-25