GEOG 1400 Lecture Notes - Lecture 20: Great Lakes Basin, Dune, Desert Pavement
26 Jan 2018
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Document Summary
Wind action: wind erodes, transports and deposits sediment, dominate on land surfaces where there are large supplies of mineral particles in a loose, dry state, deserts and semi arid lands, coastal areas where beaches provide abundant dry sand. 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. Dust storms: created by strong, turbulent winds blowing over barren surfaces, lifting fine dust to heights of several thousand meters, appears as a dark cloud, bringing low visibility and a choking dust that penetrates everywhere. "1: 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.
