What caused the water level in Wuhan Pass to rise so fast?

In July 1 1 day, after several rounds of heavy rainfall, the rainfall in Wuhan gradually weakened, and the central city was mainly moderate to moderate rain. However, the water level in Wuhan Pass has risen rapidly compared with the previous days. As of 2 1, the water level of the station has reached 28.5 1 m, which is equivalent to an increase of 0.39 m within 24 hours. At 2 1 on July 4th, the water level in Wuhan Pass was only 26.15m, which was equivalent to an increase of 2.36m in a week. Why is the water level in Wuhan Pass rising so fast?

First of all, this is mainly because Wuhan Pass is close to Dongting Lake and Panyang Lake. In normal times, Dongting Lake and Poyang Lake are like the middle reaches of the Yangtze River? Reservoir? It can alleviate the flood discharge pressure in the upper reaches of the Yangtze River, but due to the recent heavy rainfall, the water levels in these two lakes have exceeded the warning line, especially the Poyang Lake flood entering the Yangtze River? Top support? The effect is obvious. The flood speed in Wuhan, about 250 kilometers upstream, slowed down. In addition, small and medium-sized rivers, lakes and reservoirs in Hubei flow into the Yangtze River, which naturally causes the water level in Wuhan to rise rapidly.

Secondly, due to the large inflow of water from the upper reaches of the Yangtze River, a heavy rainfall from west to east in the Yangtze River basin increased the amount of water that Dongting Lake, Poyang Lake and Hanjiang River entered the main stream of the Yangtze River, which naturally affected the rise of the water level in Wuhan Pass. It is reported that in order to alleviate the flood control pressure in the middle and lower reaches of the Yangtze River, the water level of the Three Gorges has been continuously reducing the outflow. From 8: 00 on July 6th to 22,000m3/s at 8: 00 on July 6th, 1 1, the spillway was closed, only the power generation water flow was reserved, effectively reducing the flood from the upper reaches of the Yangtze River into Wuhan. On July 0 1 12, the Hydrological Bureau of the Yangtze River Committee continued to issue orange flood warnings from Chenglingji to Hankou and Dongting Lake in the middle and lower reaches of the Yangtze River. Therefore, it is estimated that in the next few days, Hankou to Datong River will still rise by about 1 m, and Jiujiang to Hukou River will exceed the guaranteed water level.

Finally, the increase of rainfall in Hubei is also an important reason for the rise of water level in Wuhan Pass. Since June, there has been continuous rainfall in the middle and lower reaches of the Yangtze River basin, which is basically maintained? Three days of light rain and five days of heavy rain State. According to the major meteorological report of Hubei Province, there will be three rounds of heavy rainfall in our province in the coming week, so it is necessary to guard against flood development and rainstorm and flood disasters. As for when is the water level in Wuhan Pass? The daily limit mainly depends on the future weather development, and it is still uncertain.