9 and 10_Masswasting and Met rocks

9 and 10_Masswasting and Met rocks - Lecture 9 and 10...

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Lecture 9 and 10 MASS WASTING Mass wasting - the process by which geologic materials (e.g., soil and rocks) are moved downslope from one place to another due to gravity Major causes of mass movement: SLOPE - the steeper the slope, the greater the downslope pull - for dry unconsolidated materials, smooth and rounded particles tend to support only very low-angle slopes while rough, sticky, or irregular particles can be piled more steeply without becoming unstable Fluids - reduces friction - for unconsolidated materials, a little water present may add cohesion, but large increase in water leads to instability Vegetation - tends to stabilize slopes Styles of motion: FALL - free-falling movement of materials SLIDE - materials slips as a coherent unit along a clearly defined plane FLOW - materials move in a chaotically, with mixing of particles within the flowing mass Mass wasting processes: Rockfall Rockslide Slump Mudflows Earthflows Debris Avalanche Creep Solifluction Some preventive measures: Reduce slope angles to create stability. Reduce additional weights on unstable slopes. Enhance vegetative cover to stabilize slopes.
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This note was uploaded on 11/20/2010 for the course LIR 30 taught by Professor Thornley,k during the Spring '08 term at Santa Rosa.

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9 and 10_Masswasting and Met rocks - Lecture 9 and 10...

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