Where is Qiantang River?

Qiantang River is an important river along the southeast coast of China. Qiantang River Basin is an important economic place in Zhejiang with dense population, rich resources and developed economy.

Qiantang River is 605 kilometers long with a drainage area of 48,800 square kilometers. For a long time, there have been different opinions about where the Qiantang River originated. In 1980s, Zhejiang Association for Science and Technology 14 scientists and technicians made a special investigation, and concluded that Xin 'anjiang, which originated from Liugujian in the southwest mountainous area of Xiuning, Anhui Province, was the main source of Qiantang River, while Lanjiang, which originated from Qingzhidaijian in Xiuning, Anhui Province, was just the largest tributary of Qiantang River.

Since ancient times, Qiantang River has been famous for its spring tide. Hangzhou Bay of Qiantang River is shaped like a big horn leading to the sea, and its width at sea is 100 km. When it reached Ganpu, it shrank to about 20 kilometers. When it went west, it was only 3 kilometers wide near Yan Guan, Haining. Sea water began to flow into Hangzhou Bay from the big bell mouth, and then rose due to the narrowing of the terrain. In addition, the bottom of Qiantang River is higher than Ganpu, and the river is shallow. When a large number of tides come in, the waves don't run fast, the waves in front haven't passed, and the ones behind have caught up.

How is the Qiantang hole formed? This is related to the shape and special topography of Hangzhou Bay where Qiantang River enters the sea. Hangzhou Bay is trumpet-shaped with a big mouth and a small belly. The channel of Qiantang River narrows sharply from the west of Ganpu, and the riverbed rises, resulting in a sharp decrease in the channel capacity. A large number of tides flood into the narrow and shallow river, and the tidal head is blocked, and the tidal head behind it advances rapidly, forcing the tidal head to stand upright, break and roar, forming a thrilling spectacle. There are many trumpet-shaped river estuaries, but few estuaries can form tidal bore. Why is Qiantang bore honored to be included in this minority? Scientists believe that the generation of tidal bore is also related to the ratio of water velocity to tidal wave velocity in rivers. If they have the same or similar speed and are evenly matched, it will be beneficial to the generation of tidal bore. If the speed difference between the two is far, even if there is a trumpet-shaped estuary, there will be no tidal bore. In addition, tidal bore can be formed in the estuary, which is related to tidal range in other places. Because Hangzhou Bay is on the west bank of the East China Sea, and the tidal range of the East China Sea is greater on the west bank than on the east bank. After the tidal wave of the Pacific Ocean enters the East China Sea from the northeast, it deflects to the right under the action of geostrophic deflection force in the process of going south, making the tidal range on the west coast greater than that on the east coast. Hangzhou Bay is located in the place where the Pacific tidal waves come straight from the east, and it is also the position with the largest tidal range on the west coast of the East China Sea. Therefore, various reasons come together and contribute to the tidal bore of Qiantang River. Like other tides, seawater is produced by the attraction of the moon and the sun. Every 24 hours and 50 minutes, the sea has two high tides and two low tides. Tides can not only bring people beauty, but also bring people great energy. Using the tidal difference generated by tidal fluctuations, electricity can be generated. The greater the tidal range, the greater the power generation energy. The tidal bore in Qiantang River is spectacular, but more importantly, it also contains huge dynamic energy. It is estimated that the power generation of tidal bore in Qiantang River is about 1/2 of that of Sanmenxia Hydropower Station.

Qiantang River is not only famous for its spring tide, but also the river of life in Hangzhou. Hangzhou, located on the north bank of the lower reaches of Qiantang River, is a famous historical and cultural city in China with a history of more than 2,000 years. In the Five Dynasties, Wu Yueguo and the Southern Song Dynasty established their capitals here, and they were called the six ancient capitals of China together with Beijing, Xi, Nanjing, Luoyang and Kaifeng. Hangzhou is a famous tourist city in China, with beautiful scenery and charming scenery, and is known as "paradise on earth".