In recent years, the floating facilities for the ocean space utilization such as the marine disaster prevention base, the floating restaurant, floating type container terminals are planned and some of those facilities are actually built. Most of these facilities are the pontoon type floating structure, and the mooring system is a mooring dolphin. In the design of such facilities, it is important that the prediction of the behavior of the pontoon type floating body supported by mooring dolphin in tsunami the objective of present research is to develop the simulation system for the prediction of the behavior of the pontoon type floating body supported by mooring dolphin in tsunami. In present simulation system, the 3D-MPS method is applied, and the solitary wave and the bore like wave are applied as a assumed tsunami. The present paper is a report of the first stage of the research, and the heaving motion on floating body in the tsunami is paid to attention, and it reports on the result of examining the detaching from mooring dolphin of floating body.

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