基于可变模糊评价方法的玄武湖水环境质量评价

Water environment quality evaluation of Xuanwu Lake based on variable fuzzy sets evaluation method

水环境污染程度与水质分级存在模糊性,但水质变化是连续的,传统的模糊集合论没有考虑事物、现象与概念动态的质的变化。针对这一问题,以南京市玄武湖为例,采用可变模糊评价方法,对玄武湖4个湖区的水环境质量进行综合评价。结果表明:可变模糊评价方法概念清晰、理论严谨、方法简便、可比性强;玄武湖水质总体约为Ⅲ类,略偏向第Ⅳ类;评价结果与多级模糊综合评价方法的结果相符,也与玄武湖的实际情况吻合,可为玄武湖水资源保护提供重要的参考依据。

The water environment pollution degree and water quality classification are fuzzy, but water quality change is contin- uous. The dynamic qualitative change of things, phenomena and concepts are not taken into account in the traditional fuzzy set theory. In the light of this problem, taking Xuanwu Lake in Nanjing City as an example, the variable fuzzy sets evaluation method is used to evaluate the water environment quality of four sub - lakes. The results show that the variable fuzzy sets evaluation meth- od is clear in concept, strict in theory, convenient in use and strongly comparable; the water environment quality of Xuanwu Lake is class III in general and slightly to class IV. The evaluation results are in line with the results of the multistage fuzzy compre- hensive evaluation method and consistent with the actual situation, which provides an important reference for water resources pro- tection.