南四湖水环境状态分析与评价

Water Environment Condition Analysis and Evaluation of Nansi Lake

根据南四湖主要入湖河流及湖内15个站点的水质监测参数-叶绿素a(Chl-a)、总磷(TP)、总氮(TN)、透明度(SD)和高锰酸盐指数(CODMn),从年际、年内不同时间段和不同监测点对南四湖及其入湖河流水质进行综合分析,旨在为南四湖的资源保护、南水北调东线工程建设及可持续发展提供依据。结果表明,湖区氮、磷浓度分布不均,空间分布具有非均一性;2010年与2004年相比,TN、CODMn有波动,总磷和叶绿素a分别下降了65.00%和60.59%,透明度升高了40.62%。南四湖及其周边河流水质总体有改善,水体的富营养化状况有所好转,但远低于Ⅲ类水质标准,尤其南阳湖,有些监测点已达重度富营养。通过对该水域的富营养化状况进行综合分析与评价。

Based on water quality parameters of 15 sites about chlorophyll a（Chl-a）,total phosphorus（TP）,total nitrogen（TN）,transparency（SD） and permanganate index（CODMn）in Nansi Lake and its main inflow rivers,water quality was comprehensively analysised by different periods and monitoring of annual and inter-annual.The results showed that distribution of nitrogen and phosphorus concentration of lake is uneven,distribution of spatial appear non-uniformity.Compared with that in 2004,despite TN and CODMn have fluctuations in 2010,but TP and Chl-a in 2010 was fallen to 65.00% and 60.59%,SD in 2010 increased by 40.62%.Water quality of Nansi Lake and its surrounding river has improved overall,eutrophication situation has grown better,but water quality is farbelow the water quality Ⅲ standard,especially the Nanyang Lake,and some monitoring sites reached to severe eutrophication.Comprehensive analysis and evaluation of water Eutrophication,can provide a theoretical basis to resources protect,the Eastern Route of the South-to-North Water Transfer Project and sustainable development in Nansi Lake.