基于置信度准则的地表水水质模糊综合评价

Fuzzy Comprehensive Evaluation of Surface Water Quality Based on Confidence Criteria

考虑到传统的模糊综合评价法中使用最大隶属度判别准则确定水质分级的缺陷,建立了基于置信度准则的水质模糊综合评价新方法,该方法可有效避免水质分级不清、结果不合理等问题。以涪江为例,用该方法对涪江水质进行了评价,结果表明采用置信度准则代替传统的模糊综合评价中的最大隶属度判别准则确定样本所属水质级别,其结果更为合理、可靠,能更准确地区分同一类别水质污染程度的差异。

Considering the defects in determination of water quality classification using maximum membership degree principle in traditional fuzzy comprehensive evaluation method, a new fuzzy comprehensive evaluation method of water quality was established based on confidence criteria. The method can effectively avoid the problems which include the unclear classification of water quality, the unreasonable result and so on. The water quality of Fujiang River was evaluated by this method. The results show that the fuzzy comprehensive evaluation method combined with confidence criteria is more reasonable and reliable than that using maximum membership degree principle for determination of water quality classification, and it can distinguish the different degrees of water pollution in the same water classification more accurately.