Original title: The largest flood in history occurred in some sections of the trunk and tributaries of the middle and lower reaches of the Yellow River. Xiaolangdi Reservoir reached the highest water level in history. Source: CCTV News Client
original title:
Affected by the recent continuous rainfall and incoming water, some sections of the trunk and tributaries of the middle and lower reaches of the Yellow River experienced the largest floods in the same period in history. Since September 27, the Yellow River has experienced three numbered floods. Up to now, the middle and lower reaches of the Yellow River are still facing the test of a long time, high water level, and large flow.
As of 12:00 on the 10th, the Xiaolangdi Reservoir, a key controlling water conservancy project on the mainstream of the Yellow River, has an inflow water level of 273.35 meters, which is close to the guaranteed water level of the reservoir at 275 meters. This is the highest water level that the Xiaolangdi Reservoir has reached since its completion. In order to reduce the flood control pressure in the middle and lower reaches of the Yellow River, the Xiaolangdi Reservoir has been fully put into flood control operation, blocking floods and cutting peaks, causing the water level of the reservoir to continue to rise. At the same time, a large amount of water has also led to large flow and high water levels in downstream rivers. The number of accidents along the line has been increasing, and the pressure on river defense has further increased.
Zhang Letian, Director of the Comprehensive Division of the Flood and Drought Prevention Bureau of the Yellow Committee of the Ministry of Water Resources: Because there are still nearly 1.9 million people living in the floodplains of Henan and Shandong on the Yellow River, we have adopted flood control in the actual dispatch of this autumn flood control. Do not flood the floodplain, and protect the lives and property of the people in the floodplain as the main dispatching principle.
In the face of extremely severe flood control situation, the Yellow River Water Conservancy Commission of the Ministry of Water Resources coordinated Liujiaxia, Wanjiazhai, Xiaolangdi, Luhun, Guxian, Hekou Village and other main and tributary reservoirs to prevent floods, staggered peaks, and cut peaks to the greatest extent, and made every effort to prevent entry Downstream water volume. Since October 2, the Yellow River Conservancy Commission of the Ministry of Water Resources has controlled the flow of the lower Yellow River at around 4,800 cubic meters per second.
Expert interpretation: Why is the Yellow River autumn flood this year so fierce?
In the first half of this year, no numbered floods occurred in the Yellow River Basin. However, after the main flood season, the Yellow River experienced numbered floods one after another.
What is the reason behind this? Look at the expert’s analysis↓
Wang Chunqing, Director of the Information Center of the Hydrology and Water Resources Bureau of the Yellow Committee of the Ministry of Water Resources:Since late August this year, the Northwest Pacific subtropical high has been unusually strong and northerly, and the southwest warm humid air current and the southeast warm humid air current have moved northward along the subtropical high. At the same time, the cold air activity in the westerly zone is frequent and frequent visits to the middle reaches of the Yellow River, so that the cold and warm air continue to converge in the middle reaches of the Yellow River to form this year’s special and extremely rare autumn rain.
Experts said that from late August to the present, the accumulated rainfall in the lower Yellow River was 2 to 5 times the multi-year average. At the same time, throughout September, the inflow of the Wei River, the largest tributary of the Yellow River, was more than twice the multi-year average. Incoming water is the largest in history since the measured observation data is available, nearly 6 times the multi-year average.
Wang Chunqing, Director of the Information Center of the Hydrology and Water Resources Bureau of the Yellow Committee of the Ministry of Water Resources:Another prominent feature this year is that the Yiluo River and Dawen River of the Weihe River rose at the same time, forming larger floods on the upper and lower sides of the Yellow River. This situation is also relatively rare in history. It is also one of the reasons for this extremely severe autumn flood this year.
Experts said that at present, the large-flow process in the lower Yellow River has lasted for 12 days, and the flood-flooding state with large flow and high water level will continue for about 15 days in the future, and the probability of river engineering and the surrounding area of the reservoir has greatly increased. Since September 27, there have been a total of 930 dams in 189 projects on the lower Yellow River, and 1,253 accidents occurred, all of which are general dangers. At present, the flood is still evolving downstream.
Wang Chunqing, Director of the Information Center of the Hydrology and Water Resources Bureau of the Yellow Committee of the Ministry of Water Resources:(October) After the 16th, under the influence of strong cold air, the subtropical high will withdraw south and the rainfall in the Yellow River Basin will basically end. Although the rainfall ends, due to the large flow process of 4000 to 5000 (cubic meters per second) in the lower reaches of the Yellow River It will last a long time, and the autumn flood season of the Yellow River is expected to end in mid-to-late October.
(Edited by Tang Jiaming)
.