Trend and Cause Analysis of Seawater Quality in Jinzhou Bay

According to the water quality monitoring data of Jinzhou Bay in July 2018, September 2018 and September 2019, the change trend of seawater quality in Jinzhou Bay is analysed. The results showed that the degree of eutrophication increased with time. The excessive emission of active phosphate is the main reason for this phenomenon. In recent years, large-scale dredging and land reclamation have been carried out in Jinzhou Bay, which has effectively removed the polluted sediment and effectively controlled and improved the heavy metal pollution in Jinzhou Bay. Therefore, it is necessary to strictly control the discharge of polluted oil into the sea.