A three-dimensional numerical analysis is performed to investigate the mechanism that a shipping container flows out to the sea due to tsunami-induced incoming and return flows and to examine the effectiveness of countermeasures for preventing the container from flowing out to the sea. It is revealed that the container can flow out to the sea if the upward speed of the container increases and its top surface begins to rotate toward the sea at the termination of its landward motion. Furthermore, it is found that a short countermeasure wall installed at the landward side of the container would be effective.

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