Mountain torrents occurred in Datong County, Xining City, Qinghai Province. How are mountain torrents caused?

On the afternoon of August 17 10, heavy rainfall suddenly fell in Datong county, Xining city, Qinghai province, causing flash floods, resulting in 17 deaths. It is understood that on August 17, the local precipitation is less than 50 mm a day, which should not cause flash floods. The reason why mountain torrents are triggered is that experts say that the formation of mountain torrents is not entirely due to rainfall, but related to local landform, soil quality and other factors.

Generally speaking, the formation of mountain torrents is mostly caused by heavy rain, mainly rivers or gullies in mountainous areas. When the precipitation is particularly heavy, it will form a flood that rises and falls sharply, leading to landslides, landslides or mudslides. The place where mountain torrents pass often becomes a mess, which not only poses a great threat to people's lives and property, but also destroys many buildings, and the destructive power is still relatively large.

In addition to heavy rain, the cause of flash floods may also be topography. If the terrain is characterized by middle and high mountains, the height difference is large, and even if the rainfall is not large, flash floods may occur. In addition, there is the condition of water source. As the name implies, most mountain torrents should be water bodies. Once stimulated by rainfall, the previous rainfall and continuous rainfall form a * * * effect, which will lead to flash floods. In addition, if the soil moisture on the top of the mountain is very saturated, once it encounters heavy rain, the original land balance will be destroyed, which will easily lead to flash floods and mudslides.

In the event of flash floods, you must keep calm, remember not to panic, and evacuate the scene as soon as possible in an organized manner and move to a higher place. If the speed of mountain torrents is particularly urgent, try not to transfer water to avoid being washed away by mountain torrents, and pay more attention to landslides or mudslides caused by mountain torrents.