A ferry-mooring system for the storm condition should be established to raise up the safety of voyage and to keep the schedule. The buoy mooring and anchor moor
ing system are under consideration for a large ferry in a storm. The present paper investigates the characteristics of the motion and the mooring tensions of the
anchor-chains and hawser in model tests and numerical simulation. The conditions of wind and wave are 50m/s in the maximum and 1.0m in the significant height, respectively. The optimal length of the chain and hawser are mainly discussed in the numerical simulation.
　The main conclusions are as follows:
(1) The horizontal motion and tension of the moored ferry can be simulated numerically with good accuracy when the coefficients of wind and current resistances and the representative distance of the acting point of mooring force from the gravity are experimentally evaluated.
(2) The buoy mooring system can be utilized. To employ an-chor-mooring, the improvement of the anchor should be consi-dered because the grabbing force of the present anchor is much smaller than the anchor-chain tensions.