标识指数评价法在2014年宁夏沙湖水质评价中的应用研究

Application of Comprehensive Water Quality Identification Index to Water Quality Assessment of Ningxia Shahu Lake in 2014

利用综合水质标识指数法及单因子水质标识指数法结合起来分析宁夏沙湖2014年具有代表性的项目监测数据,表达了沙湖水体的综合水质信息。结果表明水质单因子指数除溶解氧(DO)和总磷(TP)为Ⅰ类和Ⅱ类水质外,其他三项指标(氨氮、COD、BOD)均超出地表水功能区划的Ⅲ类水质要求,综合水质标识指数全部超过地表水Ⅲ类水质;水质定性评价结果中所有监测断面均受到轻度污染,定量评价结果表明受氨氮、COD、BOD参数影响显著,有机还原性污染物较严重,应引起重视。

Combined the single factor and integrated water quality identification index method analyzed of monitoring data from a representative sample of Ningxia Shahu lake in 2014,this study expressed the water quality information of Shahu lake. The single factor water quality indexes show that except the Dissolved Oxygen（ DO） and Total Phosphorus（ TP） as classesⅠand classⅡ,the other three indicators（ ammonia nitrogen ／COD ／BOD） are worse than class Ⅲ. The integrated water quality identification indexes all over the Shahu lake was worse than class Ⅲ; Qualitative evaluation results of water quality in Shahu lake have been lightly contaminated. Quantitative evaluation results showed that the water pollution affected by ammonia nitrogen,COD,BOD significantly,and should be taken into consideration seriously.