Date post: | 21-Dec-2015 |
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Wind• An agent of erosion
– “eolian” refers to wind
• 2 types of eolian erosion:– abrasion: sandblasting
• YARDANG
– deflation: blowing away loose particles• DESERT PAVEMENT
Dust storms and sand storms
• Dust Storm:
– strong winds – sparsely vegetated – dust is carried high into air; dark cloud
Dust storms and sand storms
• Sand Storm:
– sand can be carried only 1-2 meters high – can be heard– sand moves by SALTATION
Types of Sand Dunes:
1. Barchan
– point downwind– windward slope is gradual– leeward slope is steeper
Types of Sand Dunes:
4. Parabolic:
point upwind
vegetation anchors arms
large blowout depression in center