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Mass Wasting. Influences on Mass Movement. Nature of slope materials Amount of water Angle of slope. Classification of Mass Movements: Table 11.2. Angle of Repose- Effect of Grain Size. Fig. 11.1a. Angle of Repose- Effect of Moisture Content. Fig. 11.1b. Surface Tension. Fig. 11.2.
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Influences on Mass Movement • Nature of slope materials • Amount of water • Angle of slope
Angle of Repose- Effect of Grain Size Fig. 11.1a
Angle of Repose- Effect of Moisture Content Fig. 11.1b
Surface Tension Fig. 11.2
Unsaturated Soil Saturated Soil Fig. 11.3
How do they do that? Fig. 11.4 Kelly Mooney Photography/Corbis
Fire increases the susceptibility for erosion and mass movement Fig. 11.5 Grant Meyer
Weathered Shale Fig. 11.6 Martin Miller
Earthquake Induced Landside - Alaska Fig. 11.7
Landslide Near Anchorage, Alaska, Caused by the 1964 Earthquake Fig. 11.7
Classification of mass movements • Debris flow • Mudflow • Debris avalanche • Slump • Debris slide • Solifluction • Rockfall • Rockslide • Rock avalanche • Creep • Earthflow
Rockfalls Fig. 11.8 E.R. Degginger
Rockslide Fig. 11.9 Jeff Foott/DRK
Rock avalanche Fig. 11.10 Brian Vikander/Corbis
Soil Creep Fig. 11.11
Soil Creep Fig. 11.11
Earthflow Fig. 11.12 Steve McCutcheon/Visuals Unlimited
Debris flow Fig. 11.13 E. R. Degginger
Mudflow Fig. 11.14 Vlastimir Shone/Gamma
Debris avalanche Fig. 11.15 Russ Davies/The Image Bank
Slump Fig. 11.16 E. R. Degginger
Debris slide Fig. 11.17 Michael Collier
Solifluction Fig. 11.18
Solifluction Fletcher & Baylis Fig. 11.18
Causes of Slides • Heavy rain or snowfall • Excavation • Earthquakes
Gros Ventre Landslide, Montana A.J. Copley/Visuals Unlimited
1925 Gros Ventre Slide Fig. 11.20
Vaiont Dam Reservoir Landslide, Italy Fig. 11.22