基于可变模糊集的水库水质评价模型

针对水库水质评价指标具有多样性、随机性和模糊性的特点，在模糊综合评判的基础上，以污染贡献率法求出各污染因子的权重，采用可变模糊集方法建立水库水质评价模型。以大龙潭水库为例，选取5个断面进行水质评价，并且与改进的水质指数评价法的评价结果进行了比较。结果表明，评价模型充分考虑到各指标值隶属于优和劣的方面，考虑了最后结果隶属于各个等级的情况，并对各污染因子赋权，得出的评价结果更为合理、更贴近实际。

Variable fuzzyset basedmodel forevaluation of reservoir water quality

In accordance with the characteristics of reservoir water quality evaluation index, such as diversity, randomness and fuzzyness, a reservoir water quality evaluation model is established with the method of the variable fuzzy set by educing the weights of all the pollution factors with the method of pollution contribution rate on the basis of the fuzzy comprehensive evaluation. By taking Dalongtan Reservoir as a study case, five cross-sections of the rservoir are selected for the water quality evaluation and then compared with the evaluation results got from the improved method for the water quality index evaluation. The result shows that both the merits and defects which all the indexes values are subjected to are fully considered by the evaluation model, i.e. the final results those are subjected to all the levels are considered and, furthermore, all the pollution factors are weighted, thus the evaluation results are not only more reasonable, but also are more realistic.