A MODEL OF RELATIVE EVALUATION OF THE TRANSPORTATION CONDITION IN THE CHUGOKU AND SHIKOKU DISTRICT

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In this paper, a method of evaluating a transportation condition in a given area is proposed from the viewpoint that a transportation system as one of the conditions of industrial location should be relatively evaluated. In other words a given small area should be treated not as an independent entity but as a relative part of the whole area. When the local transportation system is improved more slowly than the average of the whole area, its relative condition degrades in the whole area in spite of a certain amount of actual improvement. Employing the graph theory and the MDS technique, we obtain both the gain and loss ratio of accessibility and the time-space configuration of the respective cities of the Chugoku and Shikoku District. This district constitutes the whole area in this study. With the aid of these ratio and configuration, we evaluate the expected change of the transportation condition caused by the realization of some important projects in this area. The results are as follows. 1. The gain and loss ratio of accessibility. When a region is treated as a relative part of the whole area, the gain and loss ratio of accessibility is an useful index to evaluate the change of its transportation condition. According to the gain and loss ratio of accessibility the construction of the Honshu-Shikoku Bridge (this level of transportation system being termed stage II) gives only four percent of gain to the region near the approach to the bridge in Shikoku. In contrast with this stage the construction of the Chugoku Jukan Expressway (stage III) greatly expand the accessibility in the surrounding areas, the highest gain ratio reaching more than 20 percent. Provided that both of the Honshu-Shikoku Bridge and Chugoku Jukan Expressway are built (stage IV), the entire Shikoku district shows a loss ratio of accessibility in spite of the construction of the bridge. The building of the Shikoku Jukan-Odan Expressways, the Chugoku Odan Expressway, and the Sanyo Jidosha Expressway together with the construction of the bridge and the Chugoku Jukan Expressway (stage V) still brings a loss ratio in the entire Shikoku district except for the small area adjacent to the approach to the bridge. 2. The time-space configuration. The time-space configuration of cities by the MDS method is an useful geographical device because the area with a gain ratio of accessibility is reduced and the area with a loss ratio enlarged on the same map. The results obtained from the maps drawn by this method are as follows. The time-space configuration of stage I, representing the state of the area before the construction of the expressways and the bridge, bears a striking resemblance to the real geographi cal map. This shows a similarity between the physical and the time space in the Chugoku and Shikoku district before their construction. The bridge construction hardly changes the time-space configuration of stage I in spite of the big project. There are two reasons for this. One is that the well-developed ferry boat network has been already organized in the Inland Sea of Seto and the other is that the bridge construction is geographically a mere local improvement in the whole transportation system. On the other hand, the construction of the Chugoku Jukan Expressway extremely reduces the time-space configuration in the Chugoku district in the east and west directions, while relatively speaking this turns out to enlarge the time-space configuration in the Shikoku district. The time-space configuration of stage IV bears another striking resemblance to that of stage III. The construction of the bridge together with the Chugoku Jukan Expressway scarcely changes the time-space configuration of stage III.
The Association of Japanese Geographersの論文

A MODEL OF RELATIVE EVALUATION OF THE TRANSPORTATION CONDITION IN THE CHUGOKU AND SHIKOKU DISTRICT

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The Association of Japanese Geographers | 論文

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