What does this idiom mean?

Refers to the Yangtze River closure project of Three Gorges Project (including Gezhouba Project).

* * * Two places, one is Gezhouba Water Control Project and the other is Three Gorges Water Control Project.

198 1 year 65438+1October 4th, the river closure project of Gezhouba Water Control Project, the first dam of China Wanli Yangtze River, was successfully completed. Gezhouba Water Control Project is located in Yichang City, Hubei Province, 3 kilometers below the Nanling Gorge exit of the Yangtze River. It is the first large-scale hydropower project built on the main stream of the Yangtze River. It is the anti-regulation and navigation cascade of the Three Gorges Project. It is 38 kilometers away from the Three Gorges Hydropower Station upstream. It is the first large-scale hydropower station on the Yangtze River and the largest low-head runoff hydropower station in the world. Commencement in May +097 1, completion in February+1988. The dam type is sluice dam, and the maximum dam height is 47.

1997165438+1October 8th, the Three Gorges Project realized the river closure. The Three Gorges Project, referred to as the Three Gorges Project for short, is a large-scale water conservancy project built in the middle and upper reaches of the Yangtze River in China. Distributed in the main stream of the Yangtze River from Chongqing, China to Yichang, Hubei. The dam is located in Sandouping, Yiling District, Yichang City, in Xiling Gorge of Three Gorges. Together with Gezhouba Hydropower Station not far downstream, it forms a cascade dispatching power station. It is the largest hydropower station in the world, and also the largest engineering project in China's history, and many problems such as immigration and environment caused by it have been accompanied by great controversy since the moment of preparation. The dam is a concrete gravity dam with a total length of 3035 meters and a dam height of 185 meters. The designed normal water level in dry season 145m (in wet season 175m) has a total storage capacity of 39.3 billion cubic meters, of which the flood control storage capacity is 22,654.38+500 million cubic meters. There are 14 hydropower stations on the left bank and 12 hydropower stations on the right bank, with 26 hydro-generators and turbines. Total installed capacity18.2 million kilowatts, and average annual power generation 1000 billion kwh. Later, an underground power station was built in the "Baishijian" mountain of the right bank dam, with six 700,000-kilowatt hydro-generators. Navigation structure includes a permanent ship lock and a vertical ship lift, both of which are arranged on the left bank.