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WINDS

PUBLISHED BY: SURENDER KUMAR
OCTOBER 25, 2012

   
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WINDS

 

Wind action can work even against the general slope of the land across hundreds of kilometres and is quite dominant in arid and semi-arid regions the absence of vegetation enables the wind to blow freely near the land surface and removes easily the dry particles of sand and dust. The erosive action of the wind is due to the impact of sand particles with objects in its path. Winds may blow from different directions the impact of sand particles may cause erosion from all direction. As wind erosion by forceful impact of sand particles is maximum at a height of a few metres above the land surface, the typical landform that is commonly formed is called the mushroom rock as depicted alongside.


 


Winds deposit materials when their velocity decreases or when there are obstructions along their path or when rainfall occurs. Deposition of sand leads to the formation of sand dunes. The most common type of sand dune is crescent-based extending in the direction in which the wind blows. These dunes are called barkhans. Dust particles transported by winds travel hundreds of kilometres before being deposited in humid regions. Such wind-blown deposits are called loess deposits and are quite common in Beijing of China.



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