Deflation (geomorphology)
In geomorphology, deflation describes the expulsion of loose material by the wind ( aeolian transport ). The process is favored by the lack of vegetation . If the process lasts longer, a deflation basin can arise. Deflation processes are involved in a variety of aeolian formations, such as the formation of yardangs or deflation terraces .
Wind close to the ground let salting (jumping) particles act like sandblasters. During this erosive process, which is known as corrosion , the wind edges typical of arid regions are often created .
Example Denmark
Sandflucht ( Danish sandflugt ) coined already in the 3rd millennium BC. Some stretches of coast and influenced the living conditions of the people. Geological layers and archaeological finds suggest periodic silting. The most recent phase dates from 1500 to 1850 AD. Drift sands devastated agricultural areas and villages in Jutland . The residents were forced to move into the hinterland. On the other hand, there were isolated efforts to repopulate the depleted dune and heather areas and to make a living through a combination of agriculture, fishing and handicrafts. The settlement of Vangså in Thy is a result of this dune colonization.
photos
Sands in Mýrdalssandur , southern Iceland
Aeolian transport of sediment at the foot of Askja , Icelandic highlands
Sandstorm in Iraq
literature
- Harald Zepp: Geomorphology. An introduction , 4th edition, Schöningh, Paderborn u. a. 2008. ISBN 978-3-506-97013-8 .
Individual evidence
- ↑ Literature: Helge Vedel, Træer og buske i landskabet . Arne Nørrevang, Danmarks natur , Volumes 1 and 7. Kaj Sand-Jensen, Naturen i Danmark. Geologies .