基于灰色聚类法的扎龙湿地水环境质量综合评价

Comprehensive evaluation on water environment quality of Zhalong wetland based on grey clustering method

湿地水环境系统是一个灰色系统.将灰色聚类法应用到湿地水环境质量评价中,建立了一套比较完善、适合于湿地的水环境质量评价体系.以地表水环境质量标准GB 3838—2002为依据,污染程度共分为5个等级.利用白化权函数描述水质分级界限,利用倒数法确定聚类权,构建了综合评判灰色数学模型,并运用此模型对扎龙湿地水环境质量进行评价与分析.评价结果证实,无论是空间上还是时间系列上,扎龙湿地水环境污染都比较严重.这种污染主要是由缺水型污染、超标型污染和内源型污染三者共同作用而形成的,其中缺水是主导因素.

The wetland water environment system is a grey system. Grey clustering method is applied to the evaluation of the water environment quality in the wetland, a superior evaluation system suitable for the wetland is proposed. Classification standard of water quality is based on the criterion GB 3838--2002, and pollution degree is divided into 5 levels. Moreover, whitenization weight function is used to describe the limit of water quality classification, clustering weight is calculated by reciprocal method, and finally a comprehensive grey mathematical model is presented. The model has been used to evaluate the water environment quality in Zhalong wetland. The result indicates that the spatial-temporal water pollution is very serious in the area studied, which is caused by the mutual interaction of water shortage, the pollutants over proof standard, and the internal pollution; while water shortage is the leading factor for the pollution.