改进的综合水质标识指数法在上海市长宁区水质评价中的应用

针对综合水质标识指数法在水质评价中无法客观考虑指标权重的情况，将改进的主成分分析法与综合水质标识指数法相结合，采用主成分分析法对单个指标权重赋值，将各指标权重用于综合水质标识指数法。将改进的综合水质标识指数法应用于上海市长宁区水质评价，并与其他水质评价方法进行比较。结果表明：长宁区各等级河道水质时空差异明显；评价结果与实际情况较为一致；此方法可操作性强，且能够直观地比较各个时间段每条河流的综合水质达标情况。

Application of improved comprehensive water quality identification index method to evaluation of water quality in Changning District, Shanghai City

As the comprehensive water quality identification index method fails to objectively take into account index weights in water quality evaluation , this study aims to combine the improved principal component analysis method and the improved comprehensive water quality identification index method , in which the former method is used for single-index weight assignment , and the weight of each index is used for the comprehensive water quality identification index method .The improved comprehensive water quality identification index method was used to evaluate the water quality of the Changning District in Shanghai City , and was compared with other water quality assessment methods .The evaluation results show that the water quality of rivers with different levels had significant spatial and temporal variations in the Changning District .The evaluation results agreed with actual situation .The method can be easily used and can compare the compliance status of comprehensive water quality for each river over various time periods .