Research on comprehensive evaluation of drinking water source based on two principal component analysis for water body classification and time-space comparability

Abstract

Based on the monitoring data of 15 indicators of 7 typical drinking water sources in Niyang River, the principal component analysis was carried out by the standard values of the corresponding surface water environmental quality standards, and first principal component analysis and second principal component analysis were constructed successively with the standardized mean value, standard deviation and the cumulative variance, eigenvector and component matrix of the principal component analysis. The models of two principal component analysis for the comprehensive evaluation of drinking water sources were constructed on the basis of a principal component analysis and two principal component analysis. The results showed that the water quality is good in the drinking water sources in Niyang River, and all the drinking water sources belong to the class II water bodies through the status evaluation, eutrophication evaluation, health risk evaluation and comprehensive evaluation. The comprehensive evaluation results based on the two principal component analysis method were completely consistent with those obtained by the single factor evaluation method, indicating that the two principal component analysis method is feasible for comprehensive evaluation of water quality. In addition, the consistency of the principal component analysis matrices ensured the comparability of the temporal and spatial variation in water quality.