China News Agency, Yichang, May 7 (Liang Zhiming) According to the news from China Three Gorges Group Co., Ltd. on the 7th, the first natural breeding ecological scheduling experiment for the production of viscous egg fish in the Three Gorges reservoir area was successfully completed a few days ago. The experiment used scheduling methods to control the water level drop in the Three Gorges Reservoir, and created suitable water level and water conservancy conditions for the carp, crucian carp and other viscous spawning fish in the reservoir area.
Since 2011, the Three Gorges Reservoir has conducted ecological scheduling experiments to promote the breeding of drifting fish in the lower reaches of Gezhouba for nine consecutive years. The spawning volume of the "Four Major Fishes" has generally shown an upward trend.
The five-day ecological scheduling experiment is different from the previous ecological scheduling experiment that promotes the natural reproduction of the "four major fishes". The scheduling range is changed from the dam channel of the Three Gorges Reservoir to the Three Gorges Reservoir area, and the scheduling object is changed to carp, crucian, etc. Sexual spawn is the first ecological dispatch attempt of the Three Gorges Reservoir to promote the reproduction of this type of fish.
According to related research, the suitable carp spawning water temperature is 17 ℃ to 23 ℃, crucian carp is 22 ℃ to 25 ℃. During the "May Day" this year, the temperature near the Three Gorges Reservoir area reached more than 17 degrees Celsius, meeting the natural breeding water temperature. In addition to the water temperature reaching a certain standard, the total drop in the water level of the Three Gorges Reservoir must be less than 0.8 meters during the dispatching experiment, which puts forward higher requirements for the precise control of the water level in the Three Gorges Reservoir.
During this test, there are many external factors such as complicated water and rain conditions, and complicated maintenance of cascade power plant units. To this end, the Three Gorges Project of the Three Gorges Electric Power Project of the Three Gorges Project was deployed ahead of schedule. On the basis of overall consideration of the requirements for the decline of the Three Gorges Reservoir and the safe operation of the power grid, with the strong support of the State Grid National Dispatch Center and the Central China Dispatching Center, the trial dispatching implementation was formulated. Program.
According to the implementation plan, the number of start-up units in the Three Gorges peak period was reduced from 16 to 13, the peak output was reduced by 2.2 million kilowatts, and the daily average outflow was reduced from the current 10,000 cubic meters per second to 8000 cubic meters per second, which guaranteed The test was successfully completed. (Finish)