Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Arid Aeolian Landform

1,345 views

Published on

Arid Aeolian Landform

Published in: Environment
  • Be the first to comment

Arid Aeolian Landform

  1. 1. Arid and Semi-AridArid and Semi-Arid Landscapes ( AeolianLandscapes ( Aeolian LandformLandform
  2. 2. World's DesertsWorld's Desertsabout 1/5th of land Types: subtropical, rain-shadow, coastal, interior, polar
  3. 3. Arid and Semi-aridArid and Semi-arid EgyptLibya Tunisia Algeria Morocco
  4. 4. Wind-Borne Sediment causesWind-Borne Sediment causes deflation and abrasiondeflation and abrasion Sahara to Caribbean Effect on Hurricanes Surface creep
  5. 5. InselbergInselberg UluruUluru (Ayers Rock)(Ayers Rock) Pediment
  6. 6. MushroomMushroom
  7. 7. Types of DesertsTypes of Deserts Erg - sea of sand • vegetation rare • sand probably formed during more humid climate
  8. 8. Death Valley, California
  9. 9. Types of DesertsTypes of Deserts Reg - desert “pavement” of pebbles and stones • all small materials and sand removed by wind • may be very thin coating of stones
  10. 10. Desert pavement
  11. 11. Hamada - bedrock predominates
  12. 12. Erosional Landform - Deflation HollowErosional Landform - Deflation Hollow Anecdote – How fast does this occur?
  13. 13. Abrasion Origin of VentifactsAbrasion Origin of Ventifacts
  14. 14. Erosional Landforms -Erosional Landforms - VentifactsVentifacts Wind eroded (sand blasted) surfaces
  15. 15. Erosional Landform –Erosional Landform – Yardangs andYardangs and ZeugenZeugen Sphinx? White Desert, EgyptWhite Desert, Egypt
  16. 16. Dune MigrationDune Migration Just like ripples in a stream Windward slope erosion and transport Slip face (deposition)
  17. 17. Star DunesStar Dunes
  18. 18. Copyright © Frank Eckardt 2002 Star DunesStar Dunes Variable Wind DirectionVariable Wind Direction
  19. 19. Longitudinal DunesLongitudinal Dunes Constant wind direction, no vegetation
  20. 20. Longitudinal DunesLongitudinal Dunes Constant wind direction, no vegetation
  21. 21. Transverse DunesTransverse Dunes Massive volumes of sand, low consistent winds
  22. 22. Transverse DunesTransverse Dunes Massive volumes of sand, low consistent windsMassive volumes of sand, low consistent winds
  23. 23. Barchan DunesBarchan Dunes Isolated Dunes, low sand supply, migrating across rock
  24. 24. Barchan DunesBarchan Dunes • Isolated – low sand supply; migrating across rock
  25. 25. Parabolic DunesParabolic Dunes Horns pinned by plants Typical of coasts
  26. 26. Fig. 15-12a, p. 354
  27. 27. Parabolic DunesParabolic Dunes • Stabilized “horns" point upwind
  28. 28. A Playa in Death Valley, CaliforniaA Playa in Death Valley, California Evaporite Pan of dried-up PlayaEvaporite Pan of dried-up Playa
  29. 29. Playas
  30. 30. Differential Erosion
  31. 31. Desert LandformsDesert Landforms • plateaus: a broad, flat-topped area elevated above the surrounding land and bounded, at least in part, by cliffs • mesa: a broad, flat-topped hill bounded by cliffs and capped with a resistant rock layer • butte: a narrow hill of resistant rock with a flat top and very steep sides
  32. 32. Inselberg or Bornhardt - highly resistant rock landform; a type of monadnock.
  33. 33. Bornhardt, Arches National Park, Utah

×