地域学における沿岸域（陸域・海域）定義の基本的考察

抄録

In this paper, we propose the concept of watershed management is being adopted in river system management. That is, the river system is analyzed using the area surrounding it. But in the case of sea water, analysis is only done qualitatively. In this study, the sea water behavior in coastal sea zone is comprehensively discussed qualitatively in total and there are existing quantitative analyses of the shore current: high tide and low tide, and the surge of the tide in shallow sea area. The coastal sea zone is redefined and presented for quantitative argument of coastal sea zone use. Moreover, the seabed surface in the coastal sea zone is used as the factor in analyzing the seawater quantitatively and it will be done on the same manner inland water is being evaluated. The beneficial effect of the presented concept on this paper regarding the analysis of the coastal sea zone will be assessed on the Japan Sea Coast: Tsuruga-wan Bay and Wakasa-wan Bay, and Pacific Sea Coast: Kuju-kuri coast and Kamogawa-wan Bay.
As a result, we clarified what could define coastal sea zone as concrete physical environment through some case study. It is an effective method for a future planning about coastal sea zone, and should be a base of discussion about that characteristic. And, we think that the measurement system of each surface area and the notice for coastal sea zone determination will be helpful to determine coastal sea zone and to grasp that characteristic. At the present time, we discuss the proposal for the definition of coastal sea zone that based on surface area and the method of both land and sea bottom surface area. At the same time, we indicate that it has much more expansion such as the proposal for the new administrative division and the evaluation method of basin area characteristic. Then, it is hoped that this result is put to practical use in various fields in future.

JEL Classification: Q25, Q51, R12, R15, R58