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EOLIAN PROCESSES AND LANDFORM1

EOLIAN PROCESSES AND LANDFORM1 - EOLIAN PROCESSES AND...

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EOLIAN PROCESSES AND LANDFORMS Erosional processes and landforms 1. deflation: entrainment of loose sediment o deflation hollow (blowout ) shallow depression produced by deflation o often originates from the destruction of vegetation (e.g. fire, recreational use of dunes) o depth is limited by lag gravel or the water table, since wet sands resists deflation and favours the establishment of plants 2. abrasion (sand blasting) o impact of entrained sand grains against rock surfaces and other grains o yardangs wind abraded ridges oriented with the prevailing winds and separated by abraded chutes that conduct windblown sand o ventifacts stones faceted (planed) by abrasion with changing direction of dominant winds, different facets merge along sharp ridges to transform rounded stones to angular ventifacts Eolian sediment transport 1. suspension o air suspends particles less than 0.2 mm in diameter o this dust is carried 1000s m upward and 1000 kms downwind, held in suspension by turbulent eddies 2.
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