船舶航行密度に伴う遭遇状態とその変化について

概要

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This paper is concerned with the research on the relationship between ship's encounter situations and traffic density, especially pay particular attention to the relationship between multiple encounter and traffic density. The encounter situations are divided into simple encounter and multiple encounter, in this paper the multiple encounter is defined when two or more than two targets are involved in the situation simultaneously and divided into same multiple encounter and different multiple encounter. Simulation was performed in random traffic condition that could be easily adjusted with traffic density. First, the encounter situation from the viewpoint of each ship was analyzed. Then the encounter combinations between the ships that involved in one encounter situation were classified according to their respective encounter situations, and the ratios of the combinations in various densities were obtained. Also through the simulation method, this paper certified the result that the ratio of the multiple encounters to the total encounters is proportional to density, whereas the number of encounters is proportional to the third power of density. Finally, using actual traffic data of Uraga channel and its vicinity in Tokyo Bay investigated in 1994, the encounter situations in Uraga channel where traffic flow are restricted by regulation rules were compared with those in random condition.
1999-09-25