Deposition
Wind deposition will occurs in area where wind velocity decreases. As the wind velocity slows down, some of the wind blown sand and other materials cannot stay airborne, and they drop out of the air stream to form a deposit on the ground. There is two types of wind deposition, dunes and loess.
Dunes
A dune is the pile of windblown sand that develops over time. In windblown environments, a dune forms from sand particles accumulating where an object, such as a rock, landform, or piece of vegetation, blocks the forward movement of the particles. Sand continues to be deposited as long as winds blow in one general direction.
All dunes have a characteristic profile. The gentler slope of a dune, located on the side from which the wind blows, is called the windward side. The steeper slope, on the side protected from the wind,is called the leeward side. The conditions under which a dune forms determine its shape. These conditions include the availability of sand, wind, velocity, wind direction, and the amount of vegetation present.
As long as the wind continues to blow, dunes will migrate. This is caused when prevailing winds continue to move and form the windward side of a dune to its leeward side, causing the dune to move slowly over time.
All dunes have a characteristic profile. The gentler slope of a dune, located on the side from which the wind blows, is called the windward side. The steeper slope, on the side protected from the wind,is called the leeward side. The conditions under which a dune forms determine its shape. These conditions include the availability of sand, wind, velocity, wind direction, and the amount of vegetation present.
As long as the wind continues to blow, dunes will migrate. This is caused when prevailing winds continue to move and form the windward side of a dune to its leeward side, causing the dune to move slowly over time.
Sand Dunes out West in the United States. When finding this in real life, the wind is constantly changing the landform. As the wind continues to take sand sediments, it can pile up and make a new sand dune.
Loess
The thick, windblown silt deposits are known as loess. Loess are created by the wind carrying fine, lightweight particles such as silt and clay in great quantities and for long distances. Many parts of Earth's surface are covered by thick layers of windblown silt, which are though to have accumulated as a result of thousands of years of dust storms. The source of these silt deposits might have need the fine sediments that were exposed when glaciers melted after the last ice age, which was more than 10,000 years ago. Loess soils are some of the most fertile soils because they contain abundant minerals and nutrients.