GEOG 1400 Lecture Notes - Lecture 11: Semi-Arid Climate, Abrasive Blasting, Geomorphology
15 Mar 2018
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Document Summary
Aeolian geomorphology (the work of the wind) (a) wind action and wind erosion (b) transport of sand (c) sand dunes (d) coastal dunes (e) loess (f) aeolian activity in canada. Wind performs two kinds of erosional work: deflation. Removal of loose particles from the ground: clay and silt are carried high into the atmosphere. Sand is moved by moderately strong winds within 1 2 meters of the ground. Sand and dust particles are driven against an exposed rock or soil surface causing the surface to be worn away. Volume of sand transported increases with wind speed. Wind transport becomes very significant with wind speeds of the order of 40-45 km/hour. Sand particles transported for the most part in saltation. Long, low leaps close to the dune surface. The sand grain is blown up the gentle slope and over the crest to fall down the slip face.
