Routing Model when Passing under a Bridge II : General Purpose of Routing Model

Abstract

A navigation officer makes a voyage plan before departing. Especially, he makes a passage plan for approaching and passing when the ship will pass through a channel or strait. Navigation route is made by a regulation for safety navigation in the congested sea area and the Maritime Traffic Safety Law sets up the Traffic Route in the main narrow channel. In recent years, the huge bridge has been built in strait, such as the Akashi strait, the Kurushima strait and the Bisan-seto strait. Although it had various discussions on the influence of the bridge pier in the narrow channel, the bridge pier has always been arranged out of the Traffic Route. In this research, we investigated by the questionnaire how the selection action consciousness of a navigation officer's planning route would change when obstacles, such as a bridge pier, had been arranged at the strait in which a vessel can navigate freely. The action of a navigation officer was modeled by the result and this model can be carried out the reappearance of the navigation routing in arbitrary strait width and bridge pier intervals. By combining this routing model and an evaluation index, it becomes possible to evaluate the influence of an arrangement of the bridge pier to marine traffic in a narrow channel.