I have enjoyed the spectacular "first-line tide" and "resurgence" of Qiantang River, but what is it like to cross the tide? Tell me what you know.

The usual cross tide, also known as the north-south tide, appears in Hangzhou Bay, the mouth of Qiantang River which flows into the East China Sea. After the two tides met, they crossed and embraced like a pair of brothers and merged into one. However, cross tides are rare and generally only occur in relatively open rivers.

55 kilometers away from Hangzhou Bay, there is a place called Daguan, which is an excellent place to watch the tide. Due to the long-term deposition of sediment, a sandbar is formed in the river channel, which divides the tidal wave from Hangzhou Bay into two waves: the east tide and the south tide. After bypassing the sandbar, the two tidal heads crossed and embraced like two brothers, forming a varied and spectacular cross tide, showing a spectacular scene of "thunder gathering on the sea and waterfalls crossing the river". At the moment when the two tides collided, a water column was stirred up, which was as high as several feet, splashing and stirring. By the time the water column fell back into the river, there were already two tidal heads on the river, which were cross-shaped and quickly ran west. At the same time, the intersection moved northward like an avalanche, hitting the straight seawall, causing huge splash and landing on the top of the pond, scaring tide watchers to scream and avoid.