China News Service, Chongqing, August 20 (Reporter Liu Xianglin) The reporter learned from the Chongqing Water Conservancy Bureau on the 20th that according to the monitoring of the Yangtze River Committee Hydrological Upstream Bureau, the Yangtze River Cuntan Station had a peak water level of 191.62 meters at 8:15 on the 20th, exceeding the limit of 8.12. Meter. This water level has reached the highest water level since the station was established.
The Yangtze River Cuntan Hydrological Station was established in 1939. It is a basic hydrological station established to explore the law of hydrological changes after the Jialing River merges into the Yangtze River and to understand the hydrological characteristics of the river. The measuring section of the station is located 7.5 kilometers downstream of the confluence of the Yangtze River and the Jialing River. The warning water level of Cuntan Hydrological Station is 180.5 meters, and the guaranteed water level is 183.5 meters. The highest water level previously recorded at the station was 191.41 meters in the 1981 flood.
Since August 11, the Yangtze River, Jialing River, and Fujian River have experienced major floods one after another. The Jialing River has formed the No. 1 and No. 2 floods in 2020, and the Yangtze River has formed the No. 4 and No. 5 floods in 2020. According to information released by the Chongqing Water Resources Bureau, from 8 am on the 19th to 8 am on the 20th, Cuntan Station, Zhutuo (3) Station, Chaotianmen Station, Caiyuanba Station, Jialing River Dongjintuo Station were affected by upstream water , Ciqikou Station, Beibei (3) Station and other 6 stations are over-guaranteed. At present, the three stations of Jintuo Station, Beibei (3) Station on the Jialing River, and Zhutuo (3) Station of the Yangtze River have peaked, and the water level has turned down, but Beibei (3) Station is still over-alarm, and the remaining 2 stations are still over-protected.
Recently, it hasn't rained heavily in Chongqing, but why has it encountered a catastrophic flood? Wang Shiping, an expert on flood prevention and drought relief of Chongqing Emergency Management Bureau, explained to the media that there are three main reasons. First, there is too much rainfall in the upstream area. Sichuan, which is adjacent to Chongqing, has been upgraded to Level I flood control emergency response in just 8 days since it launched Level IV flood control emergency response at 8 o'clock on August 11. At the same time, the main stream of the Minjiang River, Tuojiang River, Jialing River and the tributary Fujiang River in the Yangtze River Basin continued to experience heavy rains, heavy rains, and localized heavy rains. Continuous heavy rainfall caused historical qualitative peak discharges in Minjiang, Tuojiang, and Fujiang.
The second is the superposition of the two floods. Just two days after the Yangtze River's No. 4 flood peak in 2020, and the flood process has not yet ended, the No. 5 flood has formed in the upper reaches of the Yangtze River. The water levels at Ciqikou Station on the Jialing River and Caiyuanba Station on the Yangtze River have not yet fallen below the warning water level. The water level at Cuntan Station on the Yangtze River has fallen to the warning water level within 10 hours. The water level has risen again and the river bottom water is high.
The third is multi-stream convergence. The central city of Chongqing is located at the confluence of the Yangtze River and Jialing River and at the end of the Three Gorges Reservoir. The Minjiang and Tuojiang Rivers in the upper reaches of the Yangtze River merge into the Yangtze River and traverse the central urban area of Chongqing from southwest to northeast. From north to south, it merges with the Yangtze River at Chaotianmen in Chongqing. The flood process of this round was affected by the superposition of the Jialing River No. 2 flood and the Yangtze River No. 5 flood, and the Yangtze River No. 5 flood had a large peak height and a wide peak shape.
According to incomplete statistics, this round of flooding has caused more than 120,000 people in Jiangbei, Banan, Jiangjin, Tongnan, Tongliang, Hechuan and other districts and counties of Chongqing to be affected, and more than 60,000 people have been urgently relocated. The water level of the two rivers in the central urban area of the main city of Chongqing has continued to rise, causing roads, shops, garages, farmer’s markets and riverside parks in low-lying areas along the river to be flooded.
At present, relevant departments and districts and counties in Chongqing are making every effort to cope with this round of flooding.