How did the river cut off when the Three Gorges Dam was under construction?

In the early stage of river closure, the water on the right bank of the Yangtze River was enclosed to build a canal, and at the same time, a permanent lock and a temporary lock were built on the left bank of the Yangtze River. After the ship lock is completed, the second-stage closure will be started, the right cofferdam will be removed, the water flow will be stopped, and then the main channel of the Yangtze River will be cut off, and the left bank power generation dam and discharge dam will be excavated and built. After the construction is completed, the closure will be started, the cofferdam of the main channel of the Yangtze River will be dismantled, and the cofferdam will be built on the right bank of the Yangtze River. The power dam is built in the cofferdam on the right bank. After all the construction is completed, the cofferdam will be removed, so that the Three Gorges Hydropower Station will be completed.

Extended data:

The Three Gorges Project has completed all the construction tasks in three stages, with a total construction period of 17 years.

The first stage (1993- 1997) is the construction preparation and the first stage project. The construction lasted five years, marked by river closure.

The second phase (1998-2003) is the second phase of the project, which lasted for 6 years, and was marked by the realization of initial water storage of the reservoir, power generation of the first batch of units and navigation of the permanent ship lock.

The third phase (2004-2009) is a three-phase project with a construction time of 6 years, marked by the completion of all generator sets and hub projects.

The Three Gorges Dam is located in Sandouping Town, Yichang City, Hubei Province, China, 38 kilometers away from the downstream Gezhouba Water Control Project. It is the main project of the Three Gorges Hydropower Station, the core landscape of the Three Gorges Dam tourist area, and the eastern end of the Three Gorges Reservoir. It is the largest hydropower project in the world today.

The Three Gorges Dam Project consists of the main building and diversion works, with a total length of about 3,335 m and a crest elevation of 1.85m, with a total investment of 95.46 billion yuan. 65,438+0,994,65,438+2,004 officially started construction, and the whole line was completed on May 20, 2006.

With the approval of the National Defense General, the Three Gorges Reservoir was officially started at 0: 00 on September 201year 175m for the fourth experimental water storage. By 9: 00 on June 8/kloc-0, the water level of the reservoir reached160.18m .. 20. The upstream inflow surged to 46,000 cubic meters per second. 20 12 On July 24th, the inflow of the Three Gorges Dam reached 7120,000 cubic meters per second, the largest flood peak since the Three Gorges Reservoir was built.

The dam height of Three Gorges Hydropower Station is 18 1m, the normal water level is 1.75m, the dam length is 2335m, and the static investment is1352.66 billion yuan, and 32 hydropower units with a single capacity of 700,000 kilowatts are installed. The last hydropower unit of the Three Gorges Power Station was put into operation on July 4th, 20 12, which means that the Three Gorges Hydropower Station with an installed capacity of 22.4 million kilowatts became the largest hydropower station and clean energy production base in the world on July 4th, 20 12.

20 15- 12, the Three Gorges Dam was selected as the 30 best new tourist attractions in the Three Gorges of the Yangtze River.

There is no fish migration channel in the Three Gorges Dam. After the dam closure, the four major spawning grounds of fish in the Three Gorges reservoir area disappeared, but a new spawning ground was formed in the upper reaches of Jiangjin at the tail of the Three Gorges reservoir (Hejiang-Tomi section), and the hydrological process, riverbed scouring and wetland pattern in the middle and lower reaches also changed to varying degrees.

Baidu Encyclopedia-Three Gorges Dam

People's Daily-People's Daily: Great Achievements and Valuable Experiences of Three Gorges Project