湘江水利枢纽工程蓄水后对工程上游水环境营养水平影响研究

Effect of Changsha Water Conservancy Project Reservoir on the Water Environment Quality of Xiangjiang River

对湘江水利枢纽工程运行后,湘江长沙境内河段6个断面进行取样分析研究。采用主成分分析和卡尔森综合营养状态指数法,分析长沙段内湘江水体的营养状态,对比了2011年和2014年水质指标,对水质重要指标变化的原因进行了剖析。研究表明:湘江水利枢纽工程运行后,对流域内总氮及COD影响较大,湘江长沙段水体基本处于中营养状态。2014年总氮(TN)浓度比2011年的TN浓度增长了51.7%,总磷(TP)浓度下降26.6%,COD浓度在黑石铺断面以及杜甫江阁江段持续超出水质标准。

This paper analyzed the water quality indicators of six cross sections of Xiangjiang River in Changsha after the operation of Xiangjiang River water conservancy project. By using the principal component - comprehensive nutrition state index method to analyze the Eutrophication condition of Xiangjiang River, this paper contrasted the water quality indexes between 2011 and 2014 and analyzed the changing reasons in detail. The researches showed that： the TN concentration had increased 51.7%, but the concentration of TP slightly down 26. 6% in 2014 than that in 2011, with a slight rise of rip concentration. Meanwhile, the COD concentration continued to exceed the water quality standard at Heishipu Section and Du Fu pavilion Section. This study showed that the operation of Xiangjiang River water conservancy project had a significant impact on the TN and COD concentration within the river basin and Xiangjiang River was between oligotrophic to middle eutrophication as a whole.