嘉陵江南充段水质监测分析与综合评价

Monitoring Analysis and Comprehensive Evaluation of the Water Quality of Jialing River in Section of Nanchong

本文依据南充市2011年～2013年嘉陵江流域水环境监测统计资料,采用单因子评价法和综合污染指数法分析与综合评价嘉陵江南充段水质污染特征和现状.结果表明,研究河段内的清泉寺、小渡口和李渡断面总氮含量超标属于地表水Ⅳ类水体,超标倍数年均值分别0.21、0.35、0.37,其他监测项目符合Ⅲ类水质标准,均属于轻度污染.彩虹桥断面总氮、总磷、氨氮、CODMn和BOD5含量超过Ⅲ类标准,均在Ⅳ～Ⅴ类范围,属于中度污染.综合分析嘉陵江南充段,水质主要污染指标为总氮,综合污染指数为0.38,水质综合评价结果属轻度污染.该评价结果能为嘉陵江流域的水环境保护和科学治理提供依据.

Based on the monitoring data of Nanchong＇s water environment of Jialing River from 2011 to 2013, this paper analyzed and evaluated the current situation and characteristics of the river water pollution comprehensively with the single factor evaluation method and the comprehensive pollution index method. The results showed that the total nitrogen content had exceeded the surface water standard and had been class Ⅳ at the section of Qingquan temple, Xiao Dukou and Li Du, with the annual average exceed standard ratio of 0. 21, 0. 35, 0. 37 respectively. Besides, other monitoring projects were up to class Ⅲ water quality standard, and the water was polluted slightly. The total nitrogen, ammonia nitrogen, total phosphorus, CODM, and BOD5 concent had exceeded class Ⅲ and were all at the range of class Ⅳ - Ⅴ at the Caihong bridge section, with middle level pollution. With comprehensive analysis on Jialing River in section of Nanchong with the total nitrogen as the water pollution index, and the comprehensive pollution index was 0. 38, which showed that the water quality belonged to the mild pollution. Based on the evaluation results, this study can provide basis for the water environment protection and scientific management of Jialing River Basin.