Abstract
Authors carried out the model experiment for two buoys-mooring system, in the case of GT 5,000t cargo ship, in order to find the critical wave conditions which exist for safe buoy mooring in the harbour under the heavy weather. The wave condition acting on the ship were extensively changed regard to the wave length, wave height and the attack angle of wave to the fore and after buoys center line. As main results for the model experiment in regular wave, it is emphasised that the most important factors affecting the tension of buoy's mooring lines are the drifting force due to the wave than the amplitudes of the periodic ship's motions with six degrees of freedom, and that the critical height of waves for safe buoys mooring may be given 0.8m in the full draft condition and 1.0m in the half draft condition in beam seas to the ship. In addition to these experiment, the simulation for the ship's motion and mooring force were carried out by the linearized numerical model of the multiple buoys mooring system which was developed by the Japan Ship Rerearch Association.
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