Thesis on sandstorms

First of all, there are three basic conditions for the formation of sandstorm weather: first, there must be a source of sand; second, there must be strong cold air, that is, strong wind; third, there must be cold and warm air interaction. The source of sand comes from deserts, degraded forest and grassland or dry pine land without vegetation coverage, as well as sediment from urban and rural construction sites.

Cyclones and low pressure produce a vertical upward movement, blowing up sand and dust, forming sandstorms

Weather. The difference between blowing sand, floating dust and sandstorm weather is meteorologically distinguished by visibility

: Weather with horizontal visibility between 1 and 10 kilometers is called blowing sand or floating dust weather. When dusty weather occurs

the air is filled with fine particles, and the dust mostly comes from other places; the dust kicked up by blowing sand weather

is larger particles, and they Basically it is generated locally. Sandstorm weather occurs when the horizontal visibility is less than

1 kilometer. It is a disastrous weather phenomenon and causes the most serious harm.

Meteorological experts said that since the causes of sandstorms include wind, high-altitude atmospheric convection and

surface conditions, the first two are climatic factors and cannot be resisted by manpower. Therefore, the root cause is

It is currently impossible to eliminate sandstorms.

Wind disasters, sand accumulation, and wind erosion caused by sandstorms have destroyed forests and vegetation, and intensified desertification

. Meteorological experts remind that the most active and effective actions of humans in dealing with windy and sandy weather are:

First of all, we must strengthen the monitoring and forecasting of windy weather, especially in early drought conditions

Pay attention. Secondly, for a tourist metropolis like Xi'an, it is necessary to have quite effective emergency countermeasures, strengthen management and strengthen preventive measures before a sudden disaster strikes. For the whole province, the most fundamental thing is to carry out comprehensive management. The whole society has taken action together to control deserts and improve the ecological environment. While we are doing a good job in economic construction, we must also pay attention to ecological construction. Every

citizen must have a strong awareness of danger and environmental protection, and more education in this regard should be strengthened

so as to truly do a good job in afforestation and expand vegetation coverage, Increase revenue and reduce expenditure, and make rational use of water

resources. Shaanxi, in particular, is the bridgehead for the development of the western region. We should take the main measures of "returning farmland to forests (grass), closing mountains for greening, individual contracting, and using grain as relief" as the main measures, and strive to implement it as soon as possible< /p>

Now rice and grain are flowing down the river, fruits are growing up the mountains, and grasslands are covering the slopes, making the land of Sanqin green with green mountains, clear water and rich people. Gradually

restore naturally rich and diverse ecosystems. In this way, maybe in a few decades, the sandstorms will fade into our memories, and our descendants will see a northwest with beautiful mountains and rivers.

Preventing and controlling sandstorms requires adjusting the relationship between humans and nature, and vigorously protecting and improving the ecological environment. This is a complex systematic project that requires the attention of many governments and the whole society. In sand and dust source areas, we must increase afforestation and grass planting, return farmland to forests and grasslands, and limit overgrazing; we must develop clean energy sources such as solar energy and geothermal energy to reduce the emission of greenhouse gases into the atmosphere, so that we can control or reduce the harm of sand and dust storms.

Many sandstorm research experts from the Chinese Academy of Sciences recently suggested in an interview with reporters: There is a disconnect between meteorological conditions research and ground ecological environment research in China's sandstorm research, and the prevention and control of sandstorms should be integrated with heaven and earth. Professor Yang Gensheng, an expert on sandstorms in China and the Institute of Cold and Arid Regions Environment and Engineering of the Chinese Academy of Sciences, said that after years of research, China now has a clearer understanding of the causes of sandstorms. Monitoring of sandstorms and forecasting systems have also been initially formed. These results have laid the foundation for the prevention of sand and dust weather. However, to truly achieve windy and sand-free weather, it is necessary to combine sky forecasting with ground control, take targeted measures, and strengthen The intensity of large ecological construction.

Wang Tao, an expert on land desertification in China and director of the Institute of Cold and Arid Regions Environment and Engineering of the Chinese Academy of Sciences, also believes that increasing ecological governance is the fundamental way to prevent sandstorms. But at the same time, a variety of measures must be taken to resist sandstorms and reduce the losses caused by sandstorms. He said that there is also a lot of reclaimed land in Arizona, Texas and other places in the United States, but the United States is very successful in the integration of heaven and earth in the study of sand and dust storms. Every time a strong wind arrives, the American meteorological department can predict it 48 hours in advance. Accurately predict the path of strong winds, and then sprinkler irrigation on exposed cultivated land in areas where strong winds pass, making dry and loose soil moist and firm, thus cutting off the supply of wind and sand sources and effectively curbing the occurrence of sandstorms. Wang Tao believes that although China's technical strength is not as strong as that of the United States, and its facilities are not as advanced as those of the United States, we should also pay attention to the cooperation of meteorological conditions research and ecological environment management in the study of sand and dust storms, so as to achieve the integration of heaven and earth in the prevention and control of sand and dust storms.

References:

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[2] Wang Tao, Chen Guangting, Qian Zhengan, et al. Current situation and countermeasures of sandstorms in northern China [J]. Proceedings of the Chinese Academy of Sciences, 2001, (5): 343-348.

[3] Li Yigong. Through comprehensive prevention and comprehensive management, sandstorms can be basically eliminated [N]. China Green Times, 2001-12-10.

[4] Qiu Xinfa, Zeng Yan, Miao Qilong. Spatiotemporal distribution patterns of sandstorms in my country, their origins and movement paths [J]. Acta Geographica Sinica, 2001, 56(3): 316-322.

[5] Jiao Shuren. Structure and function of Zhanggutai sand-fixing forest ecosystem [M]. Shenyang: Liaoning Science and Technology Press, 1989.

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