梅山湾流域主要入湾河流水质评价

Water Quality Evaluation of Main Rivers Entering Meishan Bay Basin

为研究梅山湾入湾河流的水质污染现状以及对梅山湾的影响,选取梅山湾流域三个片区15条典型入湾河流。于2016年9月至2017年8月对河流的pH、溶解氧、叶绿素a、氨氮、亚硝酸盐氮、硝酸盐氮、活性磷酸盐等水质指标进行监测。并选用单因子和综合污染指数法对梅山湾入湾河流水质进行评价。单因子评价结果表明,梅山湾入湾河流基本为劣Ⅳ类水质,主要污染物为总无机氮和活性磷酸盐。综合污染指数评价结果表明,梅山湾流域入湾河流水质整体污染严重,大部分站位为重污染和严重污染。梅山湾两岸含有大量氮、磷等污染物的水体排入会对梅山湾海域造成富营养化污染风险,因此需严格控制入湾河流排入梅山湾。

In order to study the water pollution status of rivers entering Meishan Bay and its impact on Meishan Bay,this paper selects 15 typical rivers entering Meishan Bay in three areas of Meishan Bay basin.The pH,dissolved oxygen,chlorophyll a,ammonia nitrogen,nitrite nitrogen,nitrate nitrogen,active phosphate and other water quality indicators of the river were monitored from September 2016 to August 2017.The single factor and comprehensive pollution index methods are used to evaluate the water quality of the river entering Meishan Bay.The single factor evaluation results show that the water quality of the river into Meishan Bay is basically inferior to class IV,and the main pollutants are total inorganic nitrogen and active phosphate.The comprehensive pollution index evaluation results show that the overall water quality of the rivers entering the Bay in Meishan Bay basin is seriously polluted,and most stations are heavily polluted and seriously polluted.The discharge of water bodies containing a large amount of nitrogen,phosphorus and other pollutants on both sides of Meishan Bay will cause eutrophication pollution risk to the sea area of Meishan Bay.Therefore,it is necessary to strictly control the discharge of rivers into Meishan bay into Meishan Bay.