航路内の船舶勢力圏

摘要

これまでの航路計画基準（1）は、主として船舶の大 きさや運動性能をもとにした設計指針が示されてい る。しかし、交通流が交通環境要素間の相互作用か ら創発される複雑系であるという視点から航路計画 基準等の検討がなされたものとは言えない。著者ら は、自律型船舶群行動モデルを搭載した船舶エージ ェント群（2）～（10）から構成されるマルチエージェント 交通流シミュレーションを用いた航路計画や航路設 計への応用（11）について検討してきた。%This paper presents a new approach for analyzing several important properties of marine traffic in which a number of ships pass through a restricted route. A key concept introduced is a mapping made from those spatially distributed ships into a Voronoi tessellation. A region interior of each Voronoi cell becomes equivalent to a dominance region of a ship, equating the areal boundary kept by each ship to avoid interferences with nearest others. Experiments are performed with various traffic flows generated from the past work of a multi-agent marine traffic simulator built on autonomous ship cluster behavior model. The Voronoi diagram can be produced in real time based on the agent positions obtained from the simulation. Parameterized with route width and number of ship agents, the characteristics of ship dominance regions, the emergence rates of the three kinds of dominance region forms, the average aspect ratio of regions, and the average number of columns in the route area are investigated. In addition, the Uraga Suido Traffic Route is used for case study to observe the characteristics of the increased traffics in comparison to the present situation. The significance of this research lies in the benefit of the proposed concept, especially at the application of the basic planning and designing of a route in consideration of the navigational environmental elements.