When will the water and sediment be adjusted in 2020?

On July 4, 2020, the Yellow River diverted water and sediment for the first time. On July 4, 2002, the gates of three open tunnels and three sediment discharge tunnels of Xiaolangdi Reservoir were opened at the same time, and the first large-scale water and sediment regulation experiment of the Yellow River officially began.

In this experiment, Xiaolangdi Reservoir is used to adjust water and sediment, which changes the water-sediment imbalance into water-sediment balance, thus forming a water potential conducive to river bed scouring, providing scientific data for the long-term utilization of Xiaolangdi Reservoir in the future and reducing siltation in downstream rivers, and achieving the goal of "the river bed will not rise".

Water and sediment regulation of the Yellow River itself is an extremely complex system engineering. It is necessary not only to fully predict the water regime such as reservoir impoundment, river inflow and future weather forecast, but also to consider the riverbed scouring, siltation and engineering accidents from the bottom of Xiaolangdi dam to the estuary for nearly a thousand kilometers. In the process of water and sediment regulation, a lot of scientific analysis and calculation and the active cooperation of all parties are also needed.

Extended data:

As soon as the new China was founded, the party and the state took the management of the Yellow River as a major event, which required revival and reform. 1July 3, 9551day, the Second Session of the First National People's Congress adopted the Resolution on Radically Curing Flood Disaster of the Yellow River and Developing Comprehensive Water Conservancy Planning of the Yellow River, which put forward that the whole basin should be treated as the mainstay, emphasizing both medicine and benefit, emphasizing comprehensive utilization, and clearly controlling and utilizing water and sediment. Since then, a series of dams and reservoirs have been built on the main stream of the Yellow River, and large-scale soil and water conservation has been carried out in Gansu, Shaanxi and Shanxi. In particular, the completion of Xiaolangdi and Wanjiazhai reservoirs has laid an important engineering foundation for the regulation of water resources and water and sediment in the Yellow River.

However, the Yellow River needs to transport a lot of sediment. How to realize the docking of water sources in time and space, reasonably mix water and sediment, and transport the sediment carried by the current into the sea through dispatching without silting in the downstream, are the problems that must be solved. Otherwise, no matter how many reservoirs are built, sediment will still accumulate in the reservoir area without scientific regulation.

Such a serious problem appeared after the completion of Sanmenxia Reservoir. Since 2002, the Yellow River Committee has explored and established the prototype Yellow River, the digital Yellow River and the model Yellow River "Three Rivers" system in order to scientifically dispatch the water sources of several reservoirs to carry sand into the sea, aiming at deeply applying the high-tech with informationization as the core in the field of Yellow River management.

Xinhuanet-On July 4th, 2002, the Yellow River diverted water and sediment for the first time.

Baidu Encyclopedia-Regulation of Water and Sediment in the Yellow River