Abstract
Recently the subjects of water resources system have been extremely complex such that methods of water managment involve many problems that have to be solved.
It is the first purpose of this paper to clarify the structure of water resources system for the regional planners, policymakers and inhabitants. The second purpose is to produce two models: one is the screening model evaluating multiobjectives of regional water resources managment and the other is the synthetic watershed simulation model which is composed of the physical water system, the regional economic system and the political system to make planning decisions.
The outline of this procedure is as follows:
1) To apply Fuzzy structural Modeling (FSM) to the regional water resource structure, 2) To decide some feasible control variables of the whole watershed level by the Min-Max model method and 3) To evaluate the alternatives of regional structural or nonstructural measures with the System Dynamics method. The subjects to be accomplished with those measures are water utilization, flood control and water quality control.
These models were applied to the water resource managment of the Chitose river basin in Hokkaido.
Several results may be summarized as follows:
1) The structures as to the relative importance of water resource objectives and those measures in the study area were specified graphically.
2) The best compromised solution by using of the interactive procedure between the related parametric model and decisionmaker's relative preferences were calculated easily in the water allocation problem.
3) The process of the regional water resource subjects accomplished with structural, nonstructural or multi-measures combined with these two kinds of measures were evaluated with the dynamic model. Further-more as a result the preferential measure according to the regional developments was found from dozens of alternatives in water resources system.
