Hydrodynamic forces of tsunami current may cause additional damage by drifting ships or vessels in a harbor area. This study focuses on the damage mechanisms of drifted large ship, and aims to develop a model to analyze the large ship drifting motion by tsunami current. The model is implemented to Banda Aceh, Indonesia, to simulate the drift of a 2500-ton power plant barge of 63m-long which was drifted approximately 2.4 km inland by the 2004 Indian Ocean tsunami. In the model, the ship started drifting by the first wave, toward several kilometers inland from the original position. We found that the simulated grounding position was consistent with the evidenced position in the middle of Banda Aceh city.
