To establish a numerical analysis method for quantifying the resilience of coastal dikes, tsunami overflow on a coastal dike and resulting local scouring at its landward toe were investigated using a three-dimensional coupled fluid-structure-sediment-seabed interaction model and its verification hydraulic experiments. From a comparison between numerical results and experimental data, the predictive capability of the model was demonstrated in terms of water surface fluctuation and the profile of a scour hole after the tsunami overflow. Furthermore, it was found that armor blocks below the crown and the berm on the landward slope of the dike received large landward and upward force because of an increase in pore-air pressure inside the dike and a decrease in water pressure induced by the separation of flow, suggesting that these blocks would be vulnerable against the tsunami overflow.
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