According to the website of Xia Qing Education, the reason for the flood of estuaries is the confluence of cold and warm air, which rises in compensation current. Due to the influence of the cold current south of the coast, the surface water temperature is lower than the bottom water temperature and lower than the critical temperature that causes seawater flooding. The cold and heavy surface water will sink, while the relatively high temperature bottom water will convection to the surface through thermal factors, resulting in the flooding of bottom water.
Seawater flooding affects coastal climate: cooling down. Dehumidification. The flooding of seawater brings deep phosphate and silicate to the surface, which provides abundant nutrition for plankton and is also the bait for fish, thus forming a fish farm.