The birthplace of sandstorms
1. Origin
Sandstorms mostly occur in inland desert areas. The main source areas are the Sahara Desert. North America, Midwest and Australia are also one of the sources of sandstorms.
2. Reasons
Weather conditions that are conducive to strong winds or strong winds, favorable sand and dust source distribution and favorable air instability conditions are the main reasons for the formation of sandstorms or strong sandstorms .
3. Measures
1. Strengthen environmental protection and raise environmental protection to the level of the legal system.
2. Restore vegetation and strengthen the biological protection system to prevent sandstorms. We will protect and restore forest and grass vegetation in accordance with the law, prevent the further expansion of land desertification, and reduce the sources of sand and dust as much as possible.
3. Formulate disaster prevention, disaster relief, and disaster relief plans based on local conditions in different regions, actively promote various disaster reduction technologies, and build a number of demonstration projects to gradually promote them on a point-by-point basis to further improve the regional comprehensive defense system.
4. Control population growth, reduce the pressure of human factors on land, and protect the environment.
5. Strengthen popular science propaganda on the relationship between the occurrence and harm of sandstorms and human activities, so that people will realize that once the environment they live in is destroyed, it will be difficult to recover. This will not only aggravate natural disasters such as sandstorms, but also cause A vicious circle, so people must consciously protect their living environment.
6. Plant plants suitable for growing in arid desert areas, such as sea buckthorn, etc., to form a ground cover layer, thereby improving the ground cover environment, fixing the soil, reducing wind speed, increasing air humidity, and improving the microclimate environment. .
7. Plant low shrubs and small trees of native varieties on the edge of the desert to improve vegetation distribution. Extended information
According to historical records, from the 3rd century BC to 1949, there were 70 sandstorms in my country, averaging once every 31 years. However, the number of sandstorms in my country has increased rapidly since the 1950s, and sandstorms in my country have shown new trends such as early occurrence and large impact range.
The spatial pattern of sandstorms in my country is that there are more sandstorms in the west than in the east, and more in the north than in the south. They are mainly concentrated in the arid and semi-arid areas of northwest and north my country; the occurrence time of sandstorms is that they occur all year round. occur.
According to Zhao Jingbo et al.’s statistics on 494 sandstorms recorded in each month in my country, sandstorms mainly occur from February to May, accounting for 78.3% of the total, and March to April are the most frequent. Accounting for 49.2% of the total, followed by February and May, and smaller numbers in other months. The diurnal variation of sandstorm occurrence is mainly concentrated from noon to evening, and relatively less at night to before noon.
As a country deeply affected by sandstorms, China has built the world's largest sandstorm monitoring station. This monitoring station is located in Ningxia, a western province in China, covering an area of 2 square kilometers. It is said that this monitoring station will play an important role in dust and desert research.
Baidu Encyclopedia-Sandstorm