When a tsunami arrives at an urban port, the most serious concern is the damage caused by tsunami drifting objects. In other words, the damage caused by tsunami drifting objects was also enormous, even in previous disasters. Containers, automobiles, timber, and other objects drifted, resulting in a blockade of the port of the harbor, which required a great deal of time and expense to restore. Therefore, estimating the scale and damage of the occurrence of drifting objects in harbors is extremely important in the early restoration and reconstruction of the port. Therefore, the purpose of the present paper is to develop a practical numerical simulator capable of quantitatively predicting the scale and damage of tsunami drifting at a port. In the present paper, we select containers as representative drift objects at ports and quantitatively predict the magnitude of drift damage by containers and other objects. According to the proposed simulator, prediction of the occurrence of the drifting of the container by the tsunami propagation calculation and the MPS method is predicted, and the subsequent drifting behavior of the container is predicted by the individual element method. The occurrence of tsunami drifting, drifting range, drifting speed, and collision force, etc., can be estimated by the proposed simulator. As an example, we present a case of drift damage prediction in the container yard of Shimizu Port in Shizuoka Prefecture.
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