HYDRAULIC EXPERIMENT AND VERIFICATION OF NUMERICAL SIMULATION FOR DRIFTING AND STRANDING MULTIPLE VESSEL BY TSUNAMI

Abstract

 We performed hydraulic experiment of a number of vessels drifting and stranding by tsunami and analyzed drifting tendencies of vessel. Also we verified the accuracy of the numerical model. In the hydraulic experiment, we founded the existence of certain patterns of drifting by initial position of vessels, furthermore we confirmed that there were variability caused by complexity of flow and collision between vessels.
 We investigated the influences due to difference of the numerical model of vessel drifting, based on the rigid model, about drag and inertia forces acting on objects. When evaluating the drift of certain vessels, we have to use drag forces model considered the flow velocity distribution; on the contrary when evaluating the diffusion status of the whole vessel, influence by the difference of the model is small. Also we founded that it is necessary to consider the bottom friction in reproduction of stranding. From the above results, except the case caused by grater uncertainty, it was shown that it is possible to evaluate the drift of vessels and range of strand by the rigid model when the tsunami occurred.