南昌市瑶湖水环境质量评价

Evaluation of water environmental quality at Yaohu Lake in Nanchang City

采用单因子和综合水质标识指数评价法,按照GB3838-2002《地表水环境质量标准》Ⅲ类水体对瑶湖水环境质量进行分析评价。结果表明瑶湖水域各采样点污染严重程度基本为NH3-N>COD>TP。以枯水期的污染最为严重,各样点综合水质标识指数基本大于4.0,平水期次之,丰水期的污染程度最低。上瑶湖大部分水域为重度污染,综合水质级别大部分为Ⅴ类,中瑶湖在各时期综合水质级别大部分为Ⅳ类,而下瑶湖除在枯水期外,其余时期综合水质级别基本为Ⅲ类,污染较上瑶湖轻。总体而言,瑶湖整体水质较差,基本无法达到Ⅲ类水标准。

The single-factor and comprehensive water quality index evaluation method was used to analyze and evaluate the water environment quality at Yaohu Lake according to the Class Ⅲ water body of Surface Water Environmental Quality Standard (GB3838-2002). The results show that the pollution severity of each sampling point at Yaohu Lake is basically NH3-N > COD > TP. The pollution in the dry season is the most serious. The comprehensive water quality identification index of each sample is basically greater than 4. 0,followed by the normal season, and the pollution level during the wet season is the lowest. Most part at upper Yaohu Lake is heavily polluted, and most o￡ the comprehensive water quality grades are Class V. The comprehensive water quality level at middle Yaohu Lake in each period is mostly Class IV, while in addition to the dry season, the lower Yaohu Lake has a comprehensive water quality level o￡ Class III, and the pollution is lighter than that of upper Yaohu Lake. Overall, the water quality at Yaohu Lake is poor, and it is basically unable to meet the Class III water standard.