제한수역에서 대각도 변침으로 계획항로를 추종하기 위한 선회율에 관한 연구

Abstract

Vessels should follow a planned route to ensure safe navigation and alter course by a large degree in accordance with the characteristics of a harbor and fairway. During a vessel's turn, excessive deviation from the planned route may lead to the danger of grounding or collision. However, many ship handlers rely on their experience and senses to monitor how many miles a vessel deviates from the planned route, often feeling anxious during a significant turn. This study reviewed the optimized rate of turn that minimizes deviation from the planned route during such turns. Based on the IMO vessel maneuverability test, the rate of turn and gross tonnage were analyzed using the exponential regression method. It was confirmed that a slower rate of turn corresponds to a larger gross tonnage; thus, vessels were classified into three groups (Fast, Normal, Slow) based on their rate of turn and gross tonnage. The rate of turn of container vessels was observed at the entrance of Busan New Port No. 5 fairway, and the correlation between the rate of turn and D/T (water depth/draft) was analyzed. These results show that in restricted waters, a vessel’s rate of turn is 30% slower than the data from the IMO vessel maneuverability test. Using the theoretical formula for ship speed and turning radius, the optimum rate of turn was applied to medium and very large container ships at the entrance of Busan New Port No. 5 fairway, and it was confirmed through real ship observations that following the planned route was safely achieved. The results of this study are expected to minimize deviation from the planned route and further contribute to the prevention of marine accidents by applying the optimum rate of turn, in addition to the ship handler's experience, when making significant turns in restricted waters.