Research on water quality assurance countermeasures during the flood season of a branch of Yangtze River in Central Jiangsu Province
A branch of Yangtze River in Central Jiangsu Province was taken as the research object,based on the water quality data of inspection section from 2021 to 2023,the relationship between factor concentration and rainfall was discussed by taking total phosphorus,ammonia nitrogen,and permanganate index as the research factors and combining with regional meteorological data.To provide scientific support for guaranteeing the water quality of the branch of Yangtze River in flood season,the characteristics and causes of water quality in flood season were analyzed.The results showed that from 2021 to 2023,the average monthly water quality of the river section reached the standard at 83.3%,72.7%,and 58.3%,respectively.The months exceeding the standard were mainly concentrated in flood season(July and August)and dry season(January,February,and December).The concentration of water quality index in the examination section increased significantly during flood season,and the concentration of total phosphorus and ammonia nitrogen increased significantly,especially in 2023.The concentration of total phosphorus,ammonia nitrogen and permanganate index increased by 2.92,17.33,and 0.94 times,respectively,compared with the pre-flood concentration.The main reasons are sewage network,agricultural non-point source pollution,and surface runoff of domestic sewage.In order to ensure the quality of the water ecological environment of the branch of Yangtze River in flood season,it is suggested to strengthen the monitoring of water quality encryption,strengthen the investigation and regulation of stored sewage,promote the control of agricultural pollution,promote the quality and efficiency of township sewage treatment,deepen the law enforcement supervision of industrial enterprises,and strengthen the pollution supervision of ships and ports.
NETL
NSTL
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