Based On Entropy And The Combination Of The Coefficient Of Variation Weighting Method Of Fuzzy Comprehensive Evaluation Model

Water is the most active and import component of the Environment. The water quality whether good or bad can be directly related to people's lives and socio-economic sustainable development. Therefore, water quality assessment is extremely important. Water quality assessment is a fuzzy category with multiple indicators and classes. There are some limits of the original fuzzy comprehensive evaluation method, so how to determine the weights of the evaluation index is a very important job. Weights are equilibrium when applying entropy method. Using variation coefficients, entropy and combination weighting method can solve the defects of entropy method.In this paper, Bai-yang Lake is as the study area. The combination weighting method based on variation coefficient and entropy to water quality fuzzy comprehensive evaluation model was used to assess the water quality of Bai-yang Lake. Compared with the original evaluation method, entropy method and variation coefficient method, the main results showed as follows:1) Comparing the traditional fuzzy comprehensive evaluation method for determination of weight of evaluating indicators, The combination weighting method based on variation coefficient and entropy to water quality fuzzy comprehensive evaluation model reduces the calculation work of weight greatly.2) The combination weighting method based on variation coefficient and entropy to determine the weights of the evaluation index considers the relationship among multiple sample data and weakens the impact of anomaly value. The advanced method not only avoids the equalization problem of using entropy method but also makes the evaluation results more reasonable and accurate.3) The combination weighting method based on variation coefficient and entropy to determine the weights of the evaluation index a very scientific, rational and effective method and it has a very important application value.