Analysis of Water Quality Change Trend at the Estuary of Qinhuangdao City from 2016 to 2020
The estuary into the sea is a link between the ocean and rivers,and is easily affected by human activities on land,and the water quality of the estuary has received widespread attention from people.This paper selects 7 monitoring sections from the main estuaries in Qinhuangdao City,collects water quality monitoring data such as permanganate index(CODMn),ammonia nitrogen(NH3-N),total phosphorus(TP),and total nitrogen(TN),and analyzes the water quality of the main estuaries in Qinhuangdao City according to the"Surface Water Environmental Quality Standards"(GB 3838-2002).The results show that from 2016 to 2020,the water quality of Renzao River Estuary has been upgraded from Class Ⅴ to Class Ⅳ;the water quality of Yinma River Estuary has been upgraded from poor Class Ⅴ to Class Ⅲ;the water quality of Tanghe River Estuary has been upgraded from Class Ⅳ to Class Ⅱ;the water quality of Daihe River Estuary has been upgraded from Class Ⅲ to Class Ⅱ;the water quality of Yanghe River Estuary has been upgraded from Class Ⅲ to Class Ⅱ;the water quality of Shihe River Estuary has been upgraded from Class Ⅲ to Class Ⅱ;the water quality of Xinkai River Estuary is classified as Class Ⅱ,with no significant changes.The main pollutants in the seven estuaries are all TN,and they exceed the standard severely.The annual average concentration of each indicator in 7 monitoring sections shows that in 2020,except for TN,the water quality of Renzao River Estuary is classified as Class Ⅳ,while the water quality in other estuaries is classified as Class Ⅲ;the average annual concentration of TN in each monitoring section is significantly higher than the Class Ⅲ water quality standard value,indicating that TN is the main pollutant.
estuarywater qualitychange patterntotal nitrogenQinhuangdao City
万方数据
