Question

how wind is acted in the desert areas

Answer 1

Wind erosion, which is the process of breaking down and dispersing particles by wind movement, is one way that wind can alter an environment.

A historic example of wind erosion is the Dust Bowl of the 1930s. During this period, many states in the Great Plains region of the United States experienced severe drought, which resulted in extremely dry soil. Strong winds would then blow and pick up the dry soil, causing a dust storm. The soil was carried high in the air and transported long distances. These dust storms were so large and overwhelming that they often blocked the sun completely.

Wind erosion has the greatest impact on areas with dry soil because it is easier for wind to pick up and transport dry, light soil than it is to pick up wet soil. Like the drought-ridden Great Plains during the Dust Bowl, desert regions are also very susceptible to wind erosion. Characteristically, deserts have dry soil, or sand, that is easy to transport. Also, deserts often have fewer physical barriers, such as hills, trees, or other structures, that can slow the wind movement. Due to this lack of physical barriers, desert winds have less slowing them down or stopping their movement and are able to transport particles easier and farther.

Wind erosion can occur by two different methods, which are abrasion and deflation. These two methods of wind erosion both involve the erosion and dispersal of particles, but they shape the desert landscape in very different ways.

Wind Abrasion

Wind abrasion is the process of the wearing away of a solid object due to the impact of particles carried by the wind. The wind picks up particles and moves them. When the particles collide with a solid object, the impact causes small pieces of the object to break off. This can cause the object being hit with particles to become smooth or worn. This type of wind erosion is similar to sandblasting. During sandblasting, a person uses compressed air, or some other force, to push sand at a high velocity over an object in order to roughen or clear the surface. Wind abrasion is a natural form of sandblasting.

In deserts, wind abrasion shapes the rocks and boulders. In areas where strong winds consistently pick up sand and carry it, rocks and boulders in the wind's path can be impacted by wind abrasion. If the wind blows over low-lying rocks, it will cause them to become flattened on the upwind side. The sand particles that collide with the rock will break away small pieces of the rock until it loses its round shape and becomes flat. When the wind direction changes and particles collide with a different side of the rock or boulder, it can cause the creation of another flat surface. Rocks with flat, wind-abraded surfaces are referred to as ventifacts.

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Answer 2

• Deserts are areas with little or no rainfall & therefore, limited or non-existent plant (& animal) life. Due to lack of moisture, chemical weathering is almost absent,& mechanical weathering is the dominant activity. Wind obviously becomes the only major agent of erosion, transportation and deposition.Wind can blow without any obstruction of trees etc.Wind is also supplied with fine dust ,which help carve the landforms.

• The speed of wind depends only on the pressure gradient; sometimes it is also decided by topography (undulations of the plain land and hill features). Katabatic wind is that one comes down the hills(by night) and the anabatic winds are the ones that go up a slope (by day). Deserts too can have calm wind or strong wind; only the pressure gradient (number of isobars) decides the strength of surface wind.