On the evening of May 10
Yajiang County, Ganzi Tibetan Autonomous Prefecture, Sichuan Province
Persistent rainfall occurs
Causing mudslide disasters
The Yajiang section was washed down by mudslides in many places
Gravel and sediment blocking
Relevant departments transferred 768 people in a timely manner
Achieve successful risk aversion
On the evening of May 10, a number of cars were buried in hotels near Yajiang County, Ganzi, Sichuan The picture comes from upstream news
Be outdoors
In the event of a mudslide disaster
Do you know how to avoid danger properly?
Mudslides that are more destructive than floods
Debris flow generally refers to:
Solid components such as sediment and stone blocks on the surface
When a sufficient amount of water is encountered, mixing occurs
Flows downward like a fluid
It has the same flexible fluidity as a fluid substance
It also has the destructive power peculiar to solid matter itself
It can instantly destroy transportation facilities and even villages and towns
Cause great damage
The generation of the Yajiang mudslide in Sichuan
On the one hand, it is related to the previous forest fires
Extensive vegetation was destroyed in the burned area
Cause loose soil
On the other hand, the cumulative amount of precipitation in this round of rainfall is relatively large
Loose solids are infiltrated and eroded by heavy rainfall
It becomes a flow plastic state
It has strong erosion and handling capabilities
This further translates into mudslides
Data map of mudslide disaster The picture comes from the Internet
The whole process of debris flow is time-consuming
Ranging from a few minutes to a few hours
Most of them occur with flooding in mountainous areas
It differs from a general flood as follows:
The torrent contains a sufficient amount of solid debris such as sediment and stone
Therefore, it is more destructive than floods
A special phenomenon that precedes a debris flow
On the evening of May 10
It began to rain in Yajiang County, Ganzi, Sichuan
According to local tourists:
"Around 11 p.m., I heard the sound of a mudslide
It's loud, like an earthquake. ”
Mudslides are preceded by special phenomena
Learn about the early warning information that is familiar with the precursors of mudslides
can keep us before disaster strikes
Have more chances to escape
01
It was found that the normal flow of water in the ravine suddenly stopped
or when the flood water suddenly increases and is mixed with trees, firewood and grass
It can be confirmed that a mudslide has formed in the ravine
02
Hear something like a train roaring or muffled thunder in a ravine
It can be assumed that a debris flow is forming
Get out of the ravine quickly
03
The depths of the ravine became dark
It is accompanied by a roaring sound and a slight ground tremor
This indicates that a mudslide has occurred in the upper reaches of the valley
How to prepare for mudslides?
Data map of mudslide disaster The picture comes from the Internet
If you are outdoors
There was a mudslide disaster
Please keep in mind the following escape tips
Do not run down or up the ditch, but run up the slopes on both sides, out of the ditch and valley area.
Do not go up to trees to take shelter. Because mudslides are different from ordinary floods, they may cut off trees and get caught in the mudslide.
Do not evacuate to an open terrain with sparse tree growth, you can choose a nearby area with dense tree growth, which can block the progress of mudslides.
Don't stay on the concave side of a low, flat curve. Because the water level is higher at the bend. Also don't hide under steep hillsides with rolling rocks and lots of accumulation.
Do not evacuate to areas with thick soil, but to rocky areas with hard geology, no gravel, and not easily washed away by rain.
Proper mastery of escape skills
Strengthen their own disaster protection
Source: China Water Affairs
Editor/Reviewer: Tang Yuandong
Review: Liu Chunxiang
Emergency Science 28