3. wind erosion. common in dry climates (deserts) and along shorelines
TRANSCRIPT
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3. Wind Erosion
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• Common in Dry Climates (deserts) and along shorelines
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Dunes
• Dunes – gentle slopes faces the wind
• Wind only pick up and carry clay, silt and sand
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WIND
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desert wind erosion
pitted
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Sand Blasted and Pitted Rock
• Sand can only be picked up, up to 3 feet so lower parts get eroded away
• also get pitted rocks
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Cross bedded deposits
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• deposits from ripples and dunes
• indicate that the depositional environment was either water or wind
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4. WAVES
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ABRASION
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Longshore Current
• Movement of sediment parallel to the shore as waves strike shoreline at an angle
Waves hit at an angle, water washes back
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• http://www.youtube.com/watch?v=U9EhVa4MmEs
• http://www.youtube.com/watch?v=zEpfjyto8r0&list=PLB177833E87DA5C20
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Mass Movement
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Mass Movements–The downslope movement of
large masses of earth materials due to _______gravity
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Three Main TypesCreep
Landslides
Mudflows
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Creep
• Gradual downhill movement of soil
• Slow process
• Evidence: (tilted fences, utility pole, bent trees)
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Landslides
• Sudden and rapid downhill movement• Likely to occur on steep slopes• Caused by high precipitation which “lubricates”
sediment (deceases friction)
• http://www.youtube.com/watch?v=ZVYGJYnJTi0• http://www.youtube.com/watch?v=S1Pi64I2wTU
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Slump
La Conchita, CA
Spring 1995
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RockslidePorteau Cove, B.C
July 30, 2008
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Tully Landslide
April 27, 1993
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Mudflow
• Cause - Fine-grained sediment becomes saturated with water and begins to flow
• Likely to occur on steep slopes
• Fast and destructive
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Mt. Saint Helen’s, WA, LaharMarch 21, 1982
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