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In ancient times, the Qiantang River only had general tidal fluctuations from the Gushan estuary in Fuyang. Over time, the Yangtze River in the north gradually carries sediment from the upper reaches, forming the Taihu alluvial plain on the north bank of Hangzhou Bay, and forming a unique estuary form with the relatively stable south bank. At present, the mouth of Hangzhou Bay is 100 km from Nanhuizui on the north bank to Zhenhai on the south bank, but it reaches Yan Guan at 132 km upstream, and the river surface is actually reduced to 2.5 km wide, forming a huge trumpet-shaped estuary on the plane. The trumpet-shaped estuary structure makes more tides flow into Hangzhou Bay in the diurnal tide, which pushes the sediment deposited near the estuary to move into the bay and slowly forms a sand bar at the estuary. Similarly, due to the constraint of the shape of the bell mouth, the estuary shrinks inward and the tide

The greater the difference between the water surface and the river surface, the tidal bore will form. Under the influence of the moon's gravity, when the incoming tide reaches the vicinity of Yan Guan in Daxinganling, the highest tidal head can reach more than 3 meters, and it pushes upstream at a speed of 5-7 meters per second, just like a bamboo, which is spectacular.

The story of high tide in Qiantang River

When the Qiantang River is at high tide, like other rivers, there is neither tide nor sound.

One year, a giant came by the Qiantang River. The giant was so tall that he crossed from one side of the river to the other. He lives in Shushan, Xiaoshan County, and sets fire to salt. People don't know his name, because he lives by the Qiantang River, so they call him Qian Wang. Qian Wang has great strength. He often used his iron pole to pick some big stones and put them on the river. Soon, he piled up one mountain after another.

One day, he went to pick the salt he had burned in Shushan for three years and three months. However, the salt was only enough for him to hold one end, so he tied a big stone to the other end of the pole, tried it on his shoulder, and picked it up and crossed the north bank of the river.

It was hot at this time, and Qian Wang was a little tired because he had just had lunch, so he put down his burden and had a rest. Unexpectedly, he dozed off Just then the Dragon King of the East China Sea came out to patrol the river, and the tide came in. Up and up, even up to the shore, slowly melting all the salt on Qian Wang. When the Dragon King of the East China Sea heard that there was no such salty taste in the water, it became more and more salty. He couldn't take it anymore, so he turned around and ran away. He doesn't want to escape to the ocean and make the sea salty. King Qian slept, opened his eyes and found that the stone at one end of the pole was still on Shixia Mountain (now Shixia Mountain), but the salt at the other end was gone!

Qian Wang looked everywhere, but he couldn't find salt. As soon as he looked down, he smelled the salty taste in the river. He thought, oh, no wonder the salt is gone. Stolen by the East China Sea Dragon King. So he raised his pole and smashed it into the sea. A pole hit the big fish and they all died; Two poles turned over at the bottom of the river; The three poles brought the Dragon King of the East China Sea to the surface, begging for mercy.