It is the objective of this research to develop practical estimation methodologies for responses of and the mooring force on a floating structure in shallow seas and to clarify the characteristics of responses induced by various tsunami wave profiles. In the present paper, the estimation methodology is introduced. The Tsunami propagation is numerically simulated from the hypocenter to shallow sea after an initial Tsunami elevation around sea area above the hypocenter is predicted by using Manshinha-Smylie's method. The numerical simulation is carried out two-dimensionally. It is assumed that the floating structure is moored by catenary chains in shallow sea around Japanese Island. The two-dimensional boundary integral method is applied to a computation of the Tsunami propagations on a floating structure. The convolution integral method is applied to the prediction of the motion response with the catenary mooring tethers. In the present paper, some tools of parts of system are verified. The analysis method for the Tsunami exciting forces based on the 2-D BEM simulation program code is verified by comparing with the experimental results and another simulation results. The characteristics of responses due to the difference of Tsunami wave profile are discussed.
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