主成分分析法在东张水库水质污染特征分析与评价的应用

采用主成分分析法（PAc）对东张水库水质进行综合评价，分析了其水质的时间和空间变化特征及污染因子对水质的贡献，以揭示东张水库水质变化的时空分布规律和水质污染特征．分析评价结果表明：水质时间特征分析可由三个主成分反映。东张水库库心断面在2004-2009年时间跨度上表现为2005年水质污染综合评价排序最高。水质最好；20...

Application of Principle Component Analysis to Pollution Characters Analysis and Evaluation of Water Quality in Dongzhang Reservoir

Principal component analys i s （PAC） was appl led to comprehensive evaluat i on of water quality in Dongzhang reservoir. We have studied temporal and spatial change characteristics of water quality, and the pollution factors＇ contribution to water quality in Dongzhang reservoir; And the characteristics of water quality pollution and its rules of time space change were revealed. The results indicated that the comprehensive evaluation of water quality （CEWQ） by three principal components of the temporal characteristics of water quality in 2005 ranked the best from 2004 to 2009, and its water quality was the best; CEWq in 2009 were high-lever, and its water quality was better; CEWQ in 2006, 2007 and 2008 ranked No. 3, 2 and i, respectively; and its water quality deteriorated year by year. In 2009, CEWQ by two principal components of the space characteristics of water quality were that the water quality of each cross section was the best in winter, it met type-II water substance standard for ground water quality, and the worst in summer, type-V ; The water quality in the middle area of reservoir and the water area before dam reached type-III water substance standard for ground water quality in spring, nevertheless, type-IV in inlet water quality.