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Study on fuzzy optimization theory, model and its application in flood control operations

Flood control decisions are often involved with quantitative and qualitative criteria. In this paper, a fuzzy model is presented for flood control operations. Based on dual comparison, two models computing relative membership grades with qualitative and quantitative criteria are established, respectively. Subjective preference and iterative weights integrated method is proposed for weight-assessment. First, an initial solution of criteria weights is obtained by using proposed fuzzy optimal iteration model. Then, according to their knowledge related to real time flood operations, operators may modify the initial weights if necessary. When the relative membership grades of alternatives belonging to all rankings are fixed, the decision alternative is chosen according to the ranking characteristic value vector computed using a defuzzification equation. The case study of Fengman Reservoir flood operation (in China) is provided to illustrate the application of the proposed model.