香溪河水华期水质的灰色关联分析

Grey Correlative Analytic Evaluation of Water Quality of Xiangxi River Bay during Algal Bloom

分析了最差因子评价法、改进的W值法、污染指数法、灰色关联分析法等4种方法的特点，着重介绍了改进的灰色关联分析法计算步骤；再以2006年春季水华发生期间的香溪河库湾6个监测断面的实测资料为例，应用以上4种方法进行评价．评价结果的比较表明改进的灰色关联分析法能较准确客观地反映水环境质量的实际情况，评价的效果较为理想．灰色关联分析法的评价结果表明，香溪河库湾在水华爆发期间6个监测断面中水质级别为Ⅲ～Ⅴ类，水质较差，主要污染物为TP．此评价结果为香溪河水资源保护与管理提供了一定依据，对于三峡库区的富营养化问题研究也有一定的意义．

There are many comprehensive methods for assessing water environmental quality. The different characteristics of four assessment methods which are worst factor judgment method, improved method of W, organic pollutant comprehensive index assessment method, grey correlative analytic method, are analyzed; particularly the steps of the grey correlative analytic method. And taking Xiangxi River Bay for example, monitoring data at six sections in 2006 spring during algal bloom was occurred are analyzed by using four methods. From the results of assessment, water quality assessed by grey correlative analytic method is relatively reasonable; it shows that the water quality of Xiangxi River bay during algal bloom is from Ⅲ to Ⅴ, the main pollutants is TP. It supplies basis of offering for water resources protection of Xiangxi River bay, has a certain significance for eutrophication of the Three Gorges Reservoir.