Causes of sandstorms in Turkmenistan
It is an interaction between wind and sand.
Catastrophic weather
Phenomenon, its formation and
earth greenhouse effect
、
El Niño phenomenon
、
Sharp decline of forest
, vegetation destruction,
Destroy a species
、
climatic anomaly
It is inseparable from other factors. Among them,
population expansion
Excessive exploitation of natural resources, excessive deforestation and excessive land reclamation are the main reasons for frequent sandstorms.
Sandstorm as a kind of high intensity
wind sand disaster
Not all windy places will happen, only those areas with dry climate and sparse vegetation will have sandstorms. exist
Northwest China
The forest coverage rate is not high and poor.
Northwest people
I also want to dig licorice and hug.
Black moss
、
open out/up a mine
Making a fortune, these destructive behaviors have further intensified.
Sandstorm disaster
. Bare land can easily be rolled up by strong winds to form sandstorms or even
Strong sandstorm
Causes and countermeasures of sandstorm
cause
The study of sandstorm points out that the formation of sandstorm must meet four conditions: first, the dust material on the ground is the material basis for the formation of sandstorm; The second is strong wind, which is the dynamic basis of sandstorm formation and the dynamic guarantee of sandstorm long-distance transportation; The third is that the air state is unstable, which is very important.
Some areas
Thermal conditions, sandstorms mostly occur in the afternoon and evening, which shows the importance of local thermal conditions; Fourth, the arid climate and environment, sandstorms often occur.
Northern Henan
It is good evidence that there will be no sandstorm for a period of time after the rain in spring.
In the desert edge area in spring, due to the long-term drought, the vegetation cover on the surface is less, and the dust on the surface is easy to be blown up and transported when the wind is strong, but it is not easy to form suspension (suspension movement, small) because of the large particle size of sand.
particulate matter
Necessary conditions to ensure long-distance transportation), so it can't be transported long distance, which is only in areas far away from dust.
dust fall
Rarely seen
blown sand
The main reason.
If the wind
Lasting for a long time, forming suspension.
floating dust
It can be transported to far away places, and there will be sandstorms in the passing areas; When the wind speed decreases to a certain extent, the floating dust will fall, and there will be dust-falling weather in the local area. If it rains at this time, it will form the so-called "
Mud rain
"。
According to the four conditions needed in the process of sandstorm formation,
loess plateau
The vast desert and the destruction caused by human factors are all there.
desertification
The land in the process, the land cultivated in late spring in the north and the infrastructure under construction (such as expressway) provide sufficient material sources for the occurrence of sandstorms; In spring
upstate
Drought increases the possibility of sandstorm; The generation of gale is a complex atmospheric phenomenon, which is mainly the result of cold front activity or the adjustment of latitude and longitude circulation. It can be seen that sandstorm is the result of many complex factors and the destruction of nature by human activities.
Land desertification
The aggravation of sandstorms has played an extremely important role. In recent years, global drought (the cause of which is not clear) and other abnormal phenomena have been caused.
Weather phenomenon
It also played an inestimable role in the occurrence of sandstorms.