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Exploring Wind-Formed Landforms: from Deserts to Coastal Regions

Discover how wind shapes landforms in deserts, semi-arid areas, and coastal regions through processes like erosion, transportation, and deposition. Learn about unique formations like sand dunes, natural arches, and the Dust Bowl. Explore the energy potential of wind and different types of sand dunes, including barchan and transverse dunes. Unveil the mysteries of wind-driven landscapes worldwide.

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Exploring Wind-Formed Landforms: from Deserts to Coastal Regions

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Presentation Transcript

  1. Wind Landforms • Where are they commonly found? • deserts & semi-arid environments • coastal areas

  2. Wind Landforms • wind erosion • deflation • particles lifted in air or bounce along ground • ex. desert pavement • ex. depressions in sand dunes

  3. Wind Landforms • wind erosion, cont. • wind abrasion • impact by wind-blown particles • ex. natural arches

  4. Wind Transportation • larger-sized particles • tend to bounce along ground • smaller-sized particles • tend to be air-borne

  5. Wind Transportation • dust storm • strong winds • arid locations, severe drought, or fallow fields • The Dust Bowl • 1930s

  6. Wind as a Source of Energy • requirements • moderate to strong speeds • consistent

  7. Wind Deposition • loess • large deposits of wind-blown silt • ex. Palouse Hills (WA, ID); Tunica Hills (LA, MS) • dunes • composed of sand

  8. Types of Sand Dunes • barchan • crescent-shaped; points downwind • arid areas with limited sand supply

  9. Types of Sand Dunes, cont. • Transverse (barchanoid) • like barchan, but quite numerous • wave-like patterns • ample sand supply

  10. Types of Sand Dunes, cont. • longitudinal • ridges & furrows run parallel with prevailing winds

  11. Types of Sand Dunes, cont. • Erosional Example • parabolic • crescent-shaped; points upwind • blowout due to deflation

  12. Types of Sand Dunes, cont. • foredunes • irregularly shaped hills & depressions • complex of erosional & depositional features • usually coastal

  13. Finito!

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