三峡水库忠县段蓄水前后水质状况研究

2001-2007年对三峡库区忠县段的水质进行监测，分析蓄水前后三峡库区忠县段的水质变化。结果表明，长江忠县段在三峡水库蓄水前后水质稳定，水体的基本类别未发生改变，属地表水Ⅲ类水质。水质污染特征上蓄水前后未发生改变，主要污染因子为COD、BOD5、CODMn、TN、TP，表现为明显的有机污染特征，其整体污染水平逐年下降，在水体中所占污染比重也逐年下降。在蓄水的各阶段，库区水文状况的变化是其水质变化的主要因素之一，蓄水与悬浮物、水质状况呈一定相关性，表现为蓄水使得悬浮物降低，悬浮物降低使水质变好。

Water Quality Research of Zhongxian in the Three Gorges Reservoir Before and After Impoundment

Through monitoring the water quality of Zhongxian area of Three Gorges Reservoir from 2001 to 2007,the change of water quality before and after impoundment was analyzed.The results showed that the water quality of Zhongxian area of Three Gorges Reservoir was quite stable before and after impoundment,the basic categories of water had not been changed,the surface water was at gradeⅢ,characteristics of water pollution was also not changed before and after impoundment and the major pollutants were COD,BOD5,CODMn,TN and TP,the level of pollution and proportion in the whole pollution were both declined year by year.In each stage of impoundment,the hydrological changes were the main factors.The impoundment,suspended solids and water quality had some correlation.The impoundment reduced water suspended solids and improved water quality.