In optimal ship routing, the ship behavior in the ocean is the main concern. However, there is also different type of ship service, namely the short-distance ferry. It is evident that a novel optimal ship routing must be proposed. A ferry service in southern Japan is the focus of this study. This service takes into account the typhoons or atmospheric depressions that influence the ferry ports. The ferry service is sometimes suspended because of the considerable motion of the ships moored in harbors. A wave monitoring system has been operational since 2015; however, the methodology has not been established from the viewpoint of optimal operation. The current situation regarding the ferry service is summarized in detail in this study, and patterns of typhoons and atmospheric depressions are revealed. In particular, it is difficult for ferry users to understand the reason for suspension of the ferry service when typhoons pass several hundred kilometers away with offshore wave heights of less than 2 m. Firstly, the relation between long period waves and the actual operation is clarified. Secondly, moored ship motions are numerically simulated using measured wave data to evaluate mooring criteria. The estimation formula of the mooring criteria is modeled, and the novel concept of optimal routing for the short-distance ferry is proposed.
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