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Lecture 15 Deserts and Wind Action

Lecture 15 Deserts and Wind Action. Lecture Outline. I Deserts A) Characteristics B) Distribution C) Southwest United States i. The Great Basin ii. The Colorado Plateau II Wind Action A) Erosion B) Transportation C) Deposition III Conclusions. Lecture 3 ii.

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Lecture 15 Deserts and Wind Action

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  1. Lecture 15 Deserts and Wind Action

  2. Lecture Outline I Deserts A) Characteristics B) Distribution C) Southwest United States i. The Great Basin ii. The Colorado Plateau II Wind Action A) Erosion B) Transportation C) Deposition III Conclusions Lecture 3 ii

  3. Characteristics of Deserts < 25 cm rain per year sparse rugged vegetation two climatic types arid deserts semiarid steppes

  4. Distribution of Deserts

  5. Climate ControlsSolar Radiation and Heat Transfer

  6. Climate ControlsAtmospheric Heat Transfer Three Cell Model Hadley Cell Ferrell Cell Polar Cell

  7. Climate ControlsOceanic Heat Transfer

  8. Climate ControlsOceanic Heat Transfer – Thermohaline Circulation

  9. Distribution of Deserts Controlling Climatic Factors Atmospheric Circulation Rain Shadow Cold Ocean Currents Continentality

  10. Distribution of DesertsAtmospheric Circulation

  11. Distribution of DesertsAtmospheric Circulation

  12. Distribution of DesertsAtmospheric Circulation - The Sahara

  13. Distribution of DesertsRain Shadow

  14. Distribution of DesertsRain Shadow - The American Southwest

  15. Distribution of Deserts Cold Ocean Currents

  16. Distribution of DesertsCold Ocean Currents - The Namib Sea Surface Temperature (oC) - 03/17/02 Naval Research Laboratory, Stennis Space Center http://www.ocean.nrlssc.navy.mil/global_ncom

  17. Distribution of DesertsCold Ocean Currents - The Namib

  18. Distribution of DesertsContinentality - The Gobi

  19. Deserts of the American Southwest The Great Basin (Basin and Range) The Colorado Plateau

  20. Deserts of the American Southwest Water Bodies – Arroyos

  21. Deserts of the American SouthwestThe Great Basin rugged mountain ranges separated by flat valleys fault-controlled topography

  22. Deserts of the American SouthwestThe Great Basin

  23. Desert Landforms of the American SouthwestThe Great Basin

  24. Desert Landforms of the American SouthwestGreat Basin Landforms - Alluvial Fan alluvial fan - an outspread, gently sloping mass of alluvium deposited by a stream, particularly in an arid or semi-arid region where a stream issues from a narrow canyon onto a plain or valley floor.

  25. Desert Landforms of the American SouthwestGreat Basin Landforms – Bajada bajada - a broad, gently inclined detrital surface extending from the base of a mountain range out into an inland basin, formed by the lateral build-up of a series of alluvial fans.

  26. Desert Landforms of the American SouthwestGreat Basin Landforms - Playa playa - a dry, barren area in the lowest part of an undrained desert basin. playa lake - a shallow, intermittent lake in an arid region.

  27. Desert Landforms of the American SouthwestGreat Basin Landforms - Pediment pediment - a broad gently sloping erosion surface or plain of low relief, typically developed by running water, in an arid or semiarid region at the base of an abrupt and receding mountain front.

  28. Desert Landforms of the American SouthwestGreat Basin Landforms – Inselberg

  29. Desert Landforms of the American SouthwestGreat Basin Landforms Evolution

  30. Deserts of the American SouthwestThe Colorado Plateau beds of flat-lying sedimentary rocks >1500m above sea level due to uplift marked by monoclines

  31. Deserts of the American SouthwestColorado Plateau Landforms plateau- a relatively elevated area of comparatively flat land bounded on at least one side by cliffs mesa - a broad flat-topped hill butte - a narrow hill of resistant rock with a flat top and very steep sides

  32. Desert Landforms of the American SouthwestThe Colorado Plateau – Monocline monocline - a local steepening in an otherwise uniform gentle dip

  33. Wind Action Erosion Transport Deposition

  34. Wind ActionErosion

  35. Wind ActionErosion - Blowout

  36. Wind ActionErosion - Deflation

  37. Wind ActionErosion - Ventifacts

  38. Wind ActionTransportation

  39. Wind ActionTransportation - Dust Storms

  40. Wind ActionDeposition – Dunes

  41. Wind ActionDeposition – Dune Migration

  42. Wind ActionDeposition – Dune Morphology

  43. Wind ActionDeposition – Controlling Factors on Dune Morphology

  44. Wind ActionDeposition - Barchan Dunes

  45. Wind ActionDeposition – Transverse Dunes

  46. Wind ActionDeposition – Barchanoid Ridge Dunes

  47. Wind ActionDeposition – Star Dunes

  48. Wind ActionDeposition – Parabolic Dunes

  49. Wind ActionDeposition – Longitudinal Dunes

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