After using stepwise discriminant analysis to screen water quality evaluation indicators,305 training samples were randomly generated according to the national surface water quality standards,and a discriminant function was established to evaluate the water quality of 8 monitoring sections in a certain reservoir area of the Yangtze River Basin from 2008 to 2012 on a monthly basis.The results showed that all 7 selected water quality indicators had a significant impact on the water quality evaluation results;the misjudgment rate of the training samples is 0.328％,and the accuracy rate of the test sample evaluation is 100％,indicating that the discriminative model has high discriminative ability;the overall water quality of a certain reservoir area is good,with the water quality grade mainly classified as class Ⅲ according to the Environmental Quality Standards for Surface Water(GB 3838-2002),mainly distributed in class Ⅱ,Ⅲ,and Ⅳ.
stepwise discerning analysisselectindicatora certain reservoir areawater quality evaluation
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