mass - E Vegetation removed Types of Mass Wasting Creep...

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MASS WASTING Movement of material due to gravity Causes more property damage than all other geological disasters
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Slopes Factors: (1)Slope material and (2) angle steeper = more likely to move less friction between particles = more likely to move “angle of repose”
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Which material would you expect to have the highest angle of repose? A. Sand grains B. glass beads C. marbles D: broken bricks E. dice
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(3) Water
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(4) Vegetation
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(5) Loading
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(6) Vibration Earthquakes Loud Noises Vehicles Machinery
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(7) Size of Slope Bigger slopes less stable
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(8) Underlying Structure
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Wildfire in Santa Barbara Co, Calif. has burned 27,000 acres. In the next few years this area will experience higher mass wasting than previously. Why? A. Heat changed slope material B. Firefighters vibrated slope C. Water added to slope D. Slope has been loaded
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Unformatted text preview: E. Vegetation removed Types of Mass Wasting Creep Slump Slide – Landslide, rockslide Flows – debris flow, mudflow, earthflow, avalanche Rock Fall SOLUTIONS Gabions Fabric, mesh Vegetation Retaining Walls Drainage Recontouring Diversion Structures PRS Which prevention technique has the lowest initial cost? A. Gabions B. Diversion structures C. Recontouring D. Retaining Walls E. Vegetation I - 40 What mistakes were made? I – 40 Example What’s wrong here? Yungay, Peru May 31, 1970 50,000,000 m 3 @ 200-400 km/hr killed 29,000 Yungay, Peru Group Question What could have been done to prevent/minimize the damage? Gros Ventre, Wyoming, 1925 37,000,000 m 50-80 mph dammed river Group Question What could have been done to prevent/minimize the damage?...
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