地盤内部の応力変動の影響を考慮した漂砂量式を用いた遡上津波による地形変化シミュレーション

抄録

A sediment transport formula coupled with dynamic effective stress inside a sand bed was proposed and incorporated into an existing topographic change model so that local scour could be reproduced under severe wave action such as run-up tsunamis, and topographic change simulation on tsunami-induced local scour around a square structure was performed to verify the applicability of the proposed model. Compared with hydraulic model experiments, the present model improved the computational accuracy of not only the initial stage of local scour at the seaward corner of the structure but also the maximum depth of a scour hole after tsunami wave action; hence, the present model was very useful in predicting deposition and erosion patterns under a strong influence of effective stress inside a sand bed.