沙湖水环境污染因子时空分布规律及水质评价

Spatial and Temporal Distribution Patterns of Pollution Factors in the Water Environment and Evaluation of Water Quality of Shahu Lake

基于2020年沙湖水质数据分析水环境污染因子时空分布情况,并运用水质指标法及内梅罗指数法综合评价沙湖水质,为沙湖后续治理提供理论依据。结果表明:3—8月沙湖水质均达到《GB 3838—2002地表水环境质量标准》Ⅲ类标准,11月及以后,除局部水质恶化为Ⅳ类标准外,其余仍达到Ⅲ类标准;同批次不同点位的污染因子浓度存在一定差异;总氮和总磷是沙湖水质超标的主要污染因子。两种水质评价方法结果均表明2020年3—11月沙湖水质变化平稳且湖泊处于轻度污染状态。

Based on the water quality data of Shahu Lake in 2020,the temporal and spatial distribution of its water environment pollution factors was analyzed,and the water quality index method and the Nemerow index method were used to comprehensively evaluate the water quality of the Shahu Lake,so as to provide a theoretical basis for the follow-up treatment of Shahu Lake.The results have shown that the water quality of Shahu Lake reached the class III standard“Surface Water Environmental Quality Standard”(GB 3838—2002)from March to August.In November and later,except for the local water quality that deteriorated to the class IV standard,the rest still met the class III standard;the concentrations of pollution factors at different points in the same batch existed.There was a certain difference;total nitrogen and total phosphorus were the main pollution factors that exceed the water quality standard.The results of the two water quality evaluation methods both showed that the water quality of Shahu Lake changed steadily from March to November 2020,and the lake was in a state of mild pollution.