基于改进灰色聚类法的大气环境质量综合评价

针对灰色聚类法在环境质量评价中的不足,对其白化函数与权重确定方法进行了改进.指数型白化函数建立了样本值与各等级之间的对应关系,避免了零权重问题,修正聚类权法体现了各污染物在同一灰类之间的变化幅度.应用改进后的灰色聚类模型对福州市2004—2008年的环境空气质量进行评价.结果表明:改进后的灰色聚类法评价结果更为客观、准确.

Modified Grey Clustering Model on Air Quality Assessment

An exponential whiteness function and a modified clustering weight were developed in grey-clustering model for its shortcomings in quality assessment.Exponential whiteness function establishes the correspondence between the sample values and each grade,and avoid the problem of zero weight,the modified clustering weight reflect the each pollutant’s amplitude in the same grade of air quality.The improved-grey-clustering method is applied to air quality assessment in Fuzhou from 2004 to 2008,the results showed that improved-grey-clustering method made the evaluation results more objectively and fairly.