wind landforms where are they commonly found? –deserts & semi-arid environments –coastal...
TRANSCRIPT
Wind Landforms• wind erosion
– deflation• particles lifted in air or bounce along ground• ex. desert pavement• ex. depressions in sand dunes
Wind Landforms• wind erosion, cont.
– wind abrasion• impact by wind-blown particles• ex. natural arches
Wind Transportation• larger-sized particles
– tend to bounce along ground
• smaller-sized particles– tend to be air-borne
Wind Transportation• dust storm
– strong winds
– arid locations, severe drought, or fallow fields
– The Dust Bowl• 1930s
Wind Deposition• loess
– large deposits of wind-blown silt
– ex. Palouse Hills (WA, ID);
Tunica Hills (LA, MS)
• dunes– composed of sand
Types of Sand Dunes• barchan
– crescent-shaped; points downwind
– arid areas with limited sand supply
Types of Sand Dunes, cont.• Transverse (barchanoid)
– like barchan, but quite numerous• wave-like patterns
– ample sand supply
Types of Sand Dunes, cont.• Erosional Example
• parabolic– crescent-shaped; points upwind
– blowout due to deflation
Types of Sand Dunes, cont.• foredunes
– irregularly shaped hills & depressions
– complex of erosional & depositional features
– usually coastal