China News Service, Wuhan, August 1 (Reporter Xu Jinbo) The reporter learned from the Yangtze River Water Conservancy Commission on the 1st that due to the recent reduction in the discharge flow of the Three Gorges Reservoir and the reduction in water inflow from the two lakes (Dongting Lake and Poyang Lake), the main stream of the middle and lower reaches of the Yangtze River And the water level of the Lianghu export control station is gradually falling.
According to the relevant person in charge of the Yangtze River Water Conservancy Commission, in July this year, three major floods occurred in the Yangtze River Basin. In the face of flood conditions, the Yangtze River Water Resources Commission planned to mobilize and deploy in advance, revise and improve the plan in time, do a good job in reservoir scheduling, and through strengthening rolling consultations, monitoring and forecasting, scientific scheduling and other methods, the upper and middle reaches of the basin are jointly dispatched to intercept floods and effectively reduce floods. The flood control pressure in the middle and lower reaches of the Yangtze River, especially the Dongting Lake area.
In this process, the Three Gorges Reservoir played a key role. In response to the No. 1 flood of the Yangtze River, the maximum peak cut rate of the Three Gorges Reservoir was about 34%, and the reservoir water level was blocked above 156 meters; during the No. 2 flood of the Yangtze River, the peak cut rate of the Three Gorges Reservoir was about 46%, and the reservoir water level rose to about 164.5 meters. Since the construction of the Three Gorges Reservoir, it has become the highest water level for flood regulation during the flood season; during the No. 3 flood defense of the Yangtze River, the maximum peak cut rate of the Three Gorges Reservoir reached 36.7%.
Recently, the water coming from the upper reaches of the Yangtze River has decreased, and the water coming from the Three Gorges Reservoir has gradually faded. At 14:00 on the 1st, the flow of the Three Gorges reservoir dropped to 38,000 cubic meters per second, and the reservoir water level fluctuated and subsided. Comprehensive consideration of flood control safety and navigation requirements, to create conditions for the timely evacuation of some ships stranded in the upper and lower reaches of the Three Gorges-Gezhouba cascade. From 5 am to 20 am on the 1st, the outflow flow of the Three Gorges Reservoir is controlled at 34,500 cubic meters per second, and then restored to 38,500 cubic meters. Meters per second.
At present, due to the recent reduction in the discharge flow of the Three Gorges Reservoir and the decrease in the inflow of the two lakes, the water levels of the main stream of the Yangtze River and the outlet control stations of the two lakes are gradually falling. The water levels of the main stream control stations have all fallen below the guaranteed water level. At 12 o'clock on the 31st, the emergency response to flood and drought disaster prevention was adjusted to level III.
Experts from the Yangtze River Water Conservancy Commission said that the current flood control of the Yangtze River is in a critical period of "seven downs and eight ups." The water level in the middle and lower reaches of the Yangtze River below Jianli is still in a state of over-alarm, and the high water level has been running for more than half a month. With time being soaked by high water levels, the dangers are on the rise and aggravate, and the flood control situation in the river basin is still severe. (Finish)