Causes of typhoon backflow in Japan

I would like to ask what is the reason for the backward flow of typhoon seawater in Japan? Because of storm surge. According to the information of the National Meteorological Observatory, seawater intrusion in Japan refers to the storm surge brought by typhoon, which causes seawater to flood into coastal areas, causing serious floods and damage. This phenomenon occurs when the typhoon lands or approaches the coast, and the wind pushes the seawater to the coastal areas, which leads to the rise of the coastline and the sharp rise of the water level.