* Aeolian landforms (also spelled as eolian or æolian) are features of the Earth's surface produced by either the erosive or constructive action of the wind. * This process is not unique to earth, and it has been observed and studied on other planets, including Mars. * The word derives from Æolus, the Greek god of the winds, and the son of Hellen and the nymph Orseis. * Aeolian processes pertain to wind activity in the study of geology and weather, and specifically to the wind's ability to shape the surface of the Earth (or other planets). Winds may erode, transport, and deposit materials, and are effective agents in regions with sparse vegetation and a large supply of unconsolidated sediments. Although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as deserts. * Aeolian landform formed by materials by wind. By the Process of Erosion and Deposotion * Aeolian landform deposits particles of Sediment, Sand, Silt and Clay * Landforms are the surface types of the earth they are categorized by Natural, Physical and Human activities. * They are created by the actions of various forces of nature such as wind, water and ice * Landform creating actions are Erosional process, Depositional process and Movement of the earth's tectonic plates Types of Aeolian landforms :
1. Barchan (also spelled Barkhan)
A barchan (barkhan dune)
is an arc-shaped
(crescent-shaped) sand ridge.
* produced by the action of wind
predominately from one direction.
* These dunes migrates 100m per year.
* Barchans may be 9m -30m high and 370 m wide at the base perpendicular to the wind. * Barchans are characteristic of open, inland desert regions such as Turkistan, where the name originated. The Russian naturalist Alexander von Middendorf is credited with introducing the word into scientific literature in 1881. * The largest barchan being at Parangkusumo Beach (La Joya , Arequipa, Peru) 2. Dune
(Dunes at Holland) Less than 1m-10m high. * A dune is a hill or a ridge made of sand. Dunes are shaped by the wind, and change all the time. * Sand dunes are mounds of windblown sand.
* Strong winds or water action, cannot initiate dune formation, however, without a supply of sand. * Running water and normal winds can do this.
* elements are:
- a source of dry sand
- a means to sort and transport the sand
- a land area on which to deposit the sand.
Types of dune:
3. Dry lake
* dry lake is typically dry, hard and rough during
the dry season, but wet and very soft in the rainy
season. The water is generally freshwater.
* Dry lakes are typically formed in semi-arid to
arid regions of the world.
* The largest concentration of dry lakes in the world (nearly 22,000) is in the southern High Plains of Texas and Eastern New Mexico.
* Blowouts are saucer bowl- and trough shaped
landform naturally eroded or "blown out“
by the wind
* A blowout forms when a patch of protective
vegetation is lost
* It allowing strong winds to "blow out" sand and
form a depression.
* They generally remain small.
* Blowouts can expand to kilometers in size and up to around 70m in depth. * Blowouts provide an important habitat for flora and fauna.
* A Dreikanter is a type of ventifact. It typically forms in desert or preglacial environments, action of blowing sand. * It has three-faced pyramidal shape.
The word Dreikanter derived from Germen, it meaning is "three-edged". * some of the best examples of wind erosion are...
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