溪洛渡水电站蓄水前后金沙江水质变化趋势研究  

Variation tendencies of water quality in Jinsha River before and after Xiluodu Hydropower Station impoundment

作　　者：张鑫 ZHANG Xin(Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200434,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434

出　　处：《水利水电快报》2022年第6期105-109,共5页Express Water Resources & Hydropower Information

基　　金：中国长江三峡集团有限公司科研项目“长江上游和金沙江下游干流梯级水电开发主要生态环境影响回顾性分析与对策措施”(201703076);“长江干流梯级水电开发物候实地观测研究”(202103325)。

摘　　要：溪洛渡水电站建成后形成水库,可能对金沙江干流工程所在河段水质产生影响。利用该水电站库区2008~2020年的水质监测数据,对比分析了该水电站蓄水前后高锰酸盐指数、氨氮、总氮、总磷、汞、铅、镉、砷等污染因子的浓度变化情况,并采用Spearman秩相关系数法对污染物的变化趋势进行显著性分析。结果表明:溪洛渡水电站蓄水后的水质浓度总体呈下降趋势。溪洛渡水电站上下游断面高锰酸盐指数、氨氮、总磷、铅和砷浓度呈显著下降趋势;总氮浓度在蓄水后小幅升高,汞和镉浓度总体变化不大。The impoundment of Xiluodu reservoir possibly impact the water quality of the Jinsha river.Water quality monitoring data in reservoir area of Xiluodu Hydropower Station on the main stream of the Jinsha River from 2008 to 2020 were used to analyze variations of major pollution factors such as COD_(Mn),NH_(3)-N,TN,TP,Hg,Pb,Cd and As.Also,significance of changing trend of pollutant was tested by Spearman rank correlation coefficient.The re⁃sults showed that the water quality concentration of Xiluodu Hydropower Station displayed a downward trend after impoundment.Spearman rank correlation analysis showed that the concentration of COD_(Mn),NH_(3)-N,TP,Pb and As significantly decreased in upstream and downstream sections,TN increased slightly after impoundment,Hg and Cd did not form a significant difference.

关 键 词：水质变化 Spearman秩相关系数法 溪洛渡水电站 金沙江 

分 类 号：X824[环境科学与工程—环境工程]