What is the largest flowing desert in the world?

Desert is often synonymous with inaccessible and barren. I wonder if my friend has ever been to the desert. Do you know what is the largest flowing desert in the world? Let me introduce you.

The largest mobile desert in the world: Rubhari Desert.

Rube Artari Desert

Rubhari Desert (Arabic:? ), meaning? An empty coin? It is named because it occupies a quarter of the Arabian Peninsula. It is one of the largest deserts in the world, covering the whole southern part of Saudi Arabia and most of the territories of Oman, the United Arab Emirates and Yemen. Also known as the Arabian desert.

cause

The Rubhari Desert, located in the southern Arabian Peninsula, is the largest mobile desert in the world. The movement of sand dunes is mainly caused by monsoon. Due to the difference of wind direction and mainstream wind, sand dunes in the desert can be divided into three types, namely, crescent-shaped sand dunes in the northeast, star-shaped sand dunes in the eastern and southern edges, and linear sand dunes in the whole western half. There has been a lack of systematic research on the causes of the Lubuhari Desert at home and abroad. Through the analysis of the existing data, it can be found that natural factors such as climate, topography and paleogeography are the main factors affecting the formation of the Lubuhari desert, and the influence of human beings is not obvious.

geologic structure

The surface of the desert is covered with a thick layer of fine sand, just like the beach. It is only for different reasons, one is the long-term effect of water, and the other is the long-term effect of wind. The surface of the desert will change and move by itself, of course, under the action of the wind, because the sand will run with the wind. Dunes will move forward layer by layer and change into different shapes. The temperature difference in desert areas is large, with an average annual temperature difference of 30-50℃ and a larger daily temperature difference, and the ground temperature at noon in summer can reach above 60℃. If an egg is buried in the beach, it will be cooked soon. At night, the temperature drops below 10℃. Because of the large temperature difference between day and night, it is beneficial for plants to store sugar, so the melons and fruits in desert oasis are particularly sweet. It is windy and windy in desert areas. The maximum wind power can reach 10- 12. Strong winds blow up a lot of quicksand, forming a violent wind-blown sand flow, eroding the ground and causing great changes in the landform. People are wary that some deserts are not naturally formed, but are man-made. For example, during the period of 1908- 1938 in the United States, more than 900 million mu of forest was cut down, and a large area of grassland was destroyed, resulting in a large area of green space becoming a desert. During the Soviet Union's reclamation campaign in 1954- 1963, the grassland in Central Asia was seriously damaged, which brought not cultivated land but desert disaster.

climate

From the desert of north latitude 12? -34? This line spans 22 latitudes; Although most of the desert is north of the Tropic of Cancer, it is still regarded as a tropical desert. It is extremely hot in summer, with the temperature as high as 54℃( 129℉) in some places. Dry and hot inland, tolerable. However, coastal areas and some highlands are restricted by high humidity in summer, and there is dew or fog at night or early morning.

The average annual rainfall in the whole desert is less than 100 mm (4 inches), but the rainfall range is 0-500 mm (0-20 inches). Except for intermittent rainfall in winter, smog or sandstorm in spring, the inland sky is usually clear.

Rainstorms occasionally flood major river basins. It is cool in winter, and the coldest weather appears at high altitude and in the northernmost part. In 1950, the lowest temperature recorded in Tulef near the taplin oil pipeline (trans-Arabian oil pipeline) was-12℃, several inches of snow fell, and the pond was frozen 1 inch. The summer rainfall in the Rubhari Desert comes from the Indian Ocean monsoon. There may be winter rain in the Lubri Desert in the north. The driest part of the Arabian desert seems to be on the western edge of the Rubhari desert, north of Wadi Adeba Sil.

The wind mainly blows from the Mediterranean, and then blows to the east, southeast, south and southwest, drawing a huge arc. The windy season occurs from 12 to 1 and May-June of the following year. This period is called hot dust wind, which lasts for 30-50 days and the average wind speed is 48 kilometers per hour. Hot dust wind, which can test the patience of people trapped in the wind, is a dry wind that carries a lot of dust and changes the shape of sand dunes.

Every storm brings millions of tons of sand into the Lubuhari Desert. The blown sand is only a few feet above the ground, unless it is picked up by cyclones, dust rolls or regional sandstorms. In the middle of Inner Mongolia and the southwest of Lubuhari Desert, winds are blowing from all directions in turn. Strong southeast wind swept across the desert for several days at a time, reversing the influence of hot dust wind on sand dune formation.

One legend is that ...

In the desert, because the sand is scorched by the sun during the day, the air near the sand layer rises very fast, forming a temperature distribution in which the lower layer is hot and the upper layer is cold, resulting in the phenomenon that the air density in the lower layer is much lower than that in the upper layer. At this time, the light of the front scene will be refracted from the dense air to the less dense air, thus forming a mirage. From a distance, it looks like a reflection in the water. People who travel long distances in the desert are hot and thirsty. When they see a mirage, they often mistakenly think that they have reached the cool lake. However, a gust of wind and sand swept through, and it is still an endless desert. This scene turned out to be just an illusion. There is one in the desert? Gravel circle? It's amazing. It is a big stone that expands with heat and contracts with cold for hundreds of years, and it is rolled again and again, forming a round gravel circle on the ground, much like a manual arrangement, but it is actually formed naturally.