三峡水库蓄水前库区水质状况研究

WATER QUALITY IN THE THREE GORGES RESERVOIR BEFORE IMPOUNDMENT

采用单因子评价法,对长江三峡库区1996～2001年的水质监测资料进行水质状况分析,结果表明三峡库区江段水质状况总体良好,参与评价的各项指标多年均值均符合Ⅱ类水体标准;部分水质参数测值超Ⅱ类水体标准,其中高锰酸盐指数、总铅、氨氮为库区江段的主要污染因子;汛期水质劣于非汛期水质。采用PWQTrend水质污染发展趋势分析专业软件,对长江三峡库区6年来的水质监测资料进行水质趋势分析,结果显示库区江段水质参数浓度及污染物输送率趋势均以无显著变化为主,表明库区江段总体水质状况6年来保持基本稳定。

Single factor method was used to assess the water quality status according to the data of the Three Gorges Reservoir from 1996 to 2001. The result indicates that the water quality of the Reservoir is in good condition. The averages of all parameters assessed meet respectively Class II water quality criterion. COD-{Mn}?T-Pb and NH-3-N are primary polluting factors in this area. The water quality in flood season is inferior to that in non-flood seasons. The PWQTrend, a professional analysis software on water quality change trend,was used to analyze the water quality trend of the Reservoir,and the result shows that the change on the content level of parameters and the pollutant transport rate is mainly unremarkable indicating that the water quality of the Three Gorges Reservoir maintains stable in general during the past 6 years.