About weather disasters
Sources and paths of sand and dust
From 1999 to the spring of 2002, 53 earthquakes occurred in my country (9 in 1999, 14 in 2000, and 18 in 2001) times, 12 times in 2002), 33 of which originated from the Gobi region in central and southern Mongolia. In other words, about 60% of the sand and dust that ravages our country every year comes from abroad. This is the research result announced to the media by Li Huang, deputy director of the China Meteorological Administration, on July 2. He said that in the spring of 2002, 12 sand and dust weather processes occurred in northern my country. It has three characteristics: concentrated occurrence period, high intensity of occurrence, and wide range of influence. The sources of sand and dust weather affecting my country can be divided into two types: overseas and domestic. Analysis shows that: two-thirds of the sand and dust weather originates in the southern region of Mongolia, and is supplemented and strengthened by sand and dust materials when passing through northern my country; the sand source within the country is only about one-third. The sand and dust weather that occurs in Central Asia (Kazakhstan) is unlikely to affect the eastern part of northwest my country and even North China. The Taklimakan Desert in southern Xinjiang is an area with high incidence of sand and dust weather in my country, but it generally does not affect the eastern part of Northwest China and North China. my country's sand and dust weather paths can be divided into northwest paths, westward paths and northerly paths: Northwest 1 path, sand and dust weather generally originates from the central and western Mongolian Plateau or the Alxa Plateau in western Inner Mongolia, mainly affecting northwest my country and North China; In the northwest 2 path, sand and dust weather originates in southern Mongolia or central and western Inner Mongolia, mainly affecting the eastern part of Northwest China, northern North China, and most of Northeast China; in the west path, sand and dust weather originates in the Gobi region in southwest or southern Mongolia. The desert area in western Inner Mongolia mainly affects northwest my country and northern China; in the northerly direction, sand and dust weather generally originates from the vast area south of Ulaanbaatar, Mongolia, mainly affecting the eastern northwest region, most of northern China, and southern northeastern China.
What is a sandstorm?
Sandstorm is a general term for both sandstorm and duststorm. It refers to strong wind blowing a large amount of sand and dust material from the ground into the air, making the air particularly turbid and horizontal. Severe wind and sand weather phenomena with visibility less than 1km. A sandstorm refers to a sandstorm caused by strong winds blowing large amounts of sand into the near-surface layer; a dust storm is a storm caused by strong winds carrying large amounts of dust and other fine-grained materials into high altitudes.
Hazards of sandstorms
Sandstorms are highly disastrous weather that occurs in northwest my country and northern parts of North China. They can cause house collapse, traffic and power supply obstruction or interruption, fires, and human storage. casualties, etc., polluting the natural environment, destroying crop growth, causing serious losses and great harm to the national economic construction and the safety of people's lives and property. The main hazards of sandstorms are in the following aspects:
1. Deterioration of the ecological environment
2. Impact on production and life
3. Loss of life and property
< p>4. Traffic safety (traffic accidents such as airplanes and cars)Causes of sandstorms
Sandstorms cause soil wind erosion
According to Xinhua News Agency, Lanzhou News in China Thanks to the efforts of experts from the Institute of Cold and Arid Regions Environment and Engineering of the Academy of Sciences, a sandstorm wind tunnel simulation experiment specially set up to explore the initiation and transmission mechanism of sand and dust materials was successfully completed recently.
Sandstorm control and preventive measures
1. Strengthen environmental protection and elevate 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. People’s long-term predatory development of natural resources has caused serious damage to the natural ecological environment, and the deterioration of the environment has provided a rich source of sand and dust materials for sandstorms.
5. Control population growth, reduce the pressure of human factors on land, and protect the environment.
6. 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.