Seawater jacking.

Best answer: Seawater jacking first occurs at the estuary. Because of the low coastal terrain, the difference between the water level of the river entering the sea and the ocean level is small. In this case, when tidal seawater level rises, it is poured into the river from the estuary, and the river is on the river because of the different seawater density. Therefore, under the action of jacking, the water level will rise, and floods will easily occur.

Seawater jacking first occurs at the estuary. Because of the low coastal terrain, the difference between the water level of the river entering the sea and that of the ocean is small. In this case, when the tidal seawater level rises, it is poured into the river channel from the estuary, and because of the different seawater density, the river is on the top. Therefore, under the action of jacking, the water level will rise, and floods will easily occur.

Jacking is a geographical phenomenon. Refers to the backwater phenomenon caused by the high water level in the main stream. Tributaries that converge in the lower reaches of the Yellow River, such as Qinhe River, Natural Wenyan Canal, Jindi River and Daqing River, are propped up when the Yellow River rises. The rising tide of sea water or the rising water level of rivers and lakes block the inflow of river water, making it difficult to discharge.

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