What is the reason for the serious disaster in Zhuozhou?
Many rivers in Zhuozhou, such as Beijuma River, Xiaoqing River and Baigou River, have large flows. Many bridges in the city were washed away, some main traffic lines were interrupted, many mountain villages were cut off from water and electricity, and communication facilities were damaged. According to Xinhua News Agency on June 5438+0, as of August 1 day 10, the number of people affected in Zhuozhou was 1339 13, and the affected area was 225.38 square kilometers.
Ma Xuekuan, chief forecaster of the Central Meteorological Observatory, said that the heavy rainfall in North China can be described as "extreme" and "rare". The extreme value of this precipitation can be reflected in five aspects: long duration of heavy precipitation, large influence range, large accumulated rainfall, local precipitation exceeding extreme value and obvious topographic distribution characteristics. Experts said that the typhoon, "high-pressure dam", topography and other factors combined to form this extremely heavy rainfall.
At 9: 55 on July 28th, Typhoon Du No.5 landed on the coast of Jinjiang City, Fujian Province, and its residual circulation entered Henan on the night of the 29th and continued northward. "Du Surui" carries a lot of water vapor, and the subtropical high on the east side of it makes the pressure gradient between them very large. The east wind and southeast wind in Beijing-Tianjin-Hebei region are significantly enhanced, and the water vapor is transported to the north unimpeded.
In addition, the typhoon "Kanu" in the western Pacific has also developed, and the strong southeast wind has continuously transported the water vapor near "Kanu" to the North China Plain. On the sea surface in the east of North China, the subtropical high is entrenched in the west, and a ridge of high pressure gradually moves eastward in the west. On the evening of July 29th, the subtropical high on the north side of Beijing-Tianjin-Hebei was pulled apart from the continental high, forming a "high pressure dam" in the northern part of North China, which blocked Du's northward movement and made the rainstorm linger in Beijing-Tianjin-Hebei for a long time.
At the same time, the blocking of Taihang Mountain and Yanshan Mountain further "blessed" the heavy rainfall. When the east wind and southeast wind carrying water vapor were blocked by Taihang Mountain, there was a fierce confrontation. Taihang Mountain is orthogonal to the easterly jet stream, and the water vapor is blocked by the terrain and concentrated in the mountain and piedmont areas, resulting in extremely heavy precipitation.
The affected area is large and scattered.
Zhang Anqi, captain of Beijing Ram Rescue Team, said in an interview on the 2nd that the flood rescue in Zhuozhou is more difficult than Fangshan and Mentougou in Beijing. According to him, the water in Mentougou District is also very serious, with a water depth of more than one meter, but the water in Zhuozhou directly flooded a floor in many places. "Zhuozhou is now the main city directly divided by water. The deepest part of the water is more than three meters, and many places have become islands. Now the people's hospital is out of power, so it is very difficult to rescue. Ordinary assault boats can't get in, so they can only get in by boat. "
Li Bin, captain of Hebei Blue Sky Rescue Team, also said in an interview: "At present, one of the main difficulties faced by the rescue work is that there are many points and a wide range of people trapped, and the overall disaster area is large. There is also the lack of food and drink for the trapped people, the road traffic is blocked, and it is also difficult to transport materials to the disaster area. The Cangzhou Municipal Government has been coordinating to solve these problems. "
Reference to the above content: Upstream News-Zhuozhou Flood First Reading: Why is the situation serious, what is the evacuation situation of the trapped people, and what are the difficulties in rescue?