GEOG 574 Lecture Notes - Lecture 4: Dune, Silt, Exogeny
Document Summary
Aeolian landforms are abundant only in arid areas where other agents are absent or minimal. Transport of sediment by wind tends to be less effective than other exogenic processes. Air is about 1000x less dense than water and therefore can only transport small. The amount of material transported depends on grain size and wind speed as sediment particles well as topography, vegetation, and moisture. Grains bounce forward along the surface. Transport of sediment by wind occurs by: Coarse grains roll and slide forward along the surface. Deposition of wind transported sediment takes on the form of: Creeping grains stop on a rough surface. Grains stop moving and settle on the surface. Wind transports small particles leaving the surface covered by only . Wind transports away from areas of low relief result in depressions desert (stone) pavement. Deposition of sediment transported by wind results in sheets of sand or silt. Large accumulations of moving sand which can build up to form.
