改进的等斜率灰色聚类法在地面水质量评价中的应用与分析

为了更好地将等斜率灰色聚类法应用于地表水质评价，提出了改进的等斜率灰色聚类法——灰色聚类样点排序法，并通过实例的计算比较，讨论灰色聚类样点排序法再权重处理过程的可行性。可以得出灰色聚类样点排序法能兼顾到：1）各测点地实测污染浓度都在级别标准范围内较有规律的变化，各污染物的标准之间差异不太大；2）污染物分布的离散度太大，各标准值之间差别也太大这两种情况。

The Calculation and Analysis of the Improved Isogeny Point Obscure Clustering Method in Surface Water Quality Evaluation

In order to better apply the isogradient obscure clustering method to the surface water environmental quality assessment,we introduce the improved the isogradient obscure clustering method--the obscure clustering sample permutation method, and compared the isogeny point obscure clustering method and the obscure clustering sample permutation method by example. The authors discuss the isogradient obscure clustering method in handling the weighting in the surface water environmental quality assessment . The two problems that are more practicable had been pointed out by the obscure clustering sample permutation method,i. e. 1) the determined pollution density of all the tested concentration changes within the standard range and no great differences are found in the standard level among pollution;2) pollutants are scattered largely apart and every standard level has great differences among them. This paper points out that the obscure clustering sample permutation method is more practicable than the isogeny point obscure clustering method.