On the Safe Navigation in Confined Water Including the Effect of Wind and Current

概要

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This paper is mainly concerned with the safe navigation between deep-drafted vessels moving each other in restricted waterways under the external force, such as wind or current. The manoeuvring simulation for model ship was conducted to find out an appropriate safe speed and distance between ships, which is required to avoid sea accident from the viewpoint of marine safety. The conditions were varied, such as velocity ratios, ship-length ratios, and separate parameters including the direction and velocity of wind and current. From the inspection of this investigation, it indicates the following result. Firstly, for the case of ship-size estimation, the lateral separation between two ships is more required for the small vessel, compared to the large vessel regardless of the effect of external force. Secondly, the lateral distance between ships are necessarily required for the velocity ratio of 1.2, compared to the cases of 0.6 and 1.5. Thirdly, in case of proximal navigation between ships under the wind and current, the low-speed vessel is potentially hazardous because the rudder force of low-speed vessel needed for steady-state course-keeping is not sufficient, compared to the high-speed vessel.
社団法人日本船舶海洋工学会の論文