WEATHERING & MASS WASTING. Weathering Processes Factors Influencing Weathering Processes Physical Weathering Processes –Frost action –Crystallization.
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WEATHERING&
MASS WASTING
Weathering Processes
• Factors Influencing Weathering Processes • Physical Weathering Processes
– Frost action– Crystallization (salt-crystal growth)– Pressure-release jointing
• Chemical Weathering Processes – Hydration and hydrolysis– Oxidation– Carbonation and solution
Regolith, Soil, and Parent Materials
Figure 10.4
Physical Weathering
Figure 10.6
Joint-block Separation
Figure 10.6
Physical Weathering in
Sandstone
Figure 10.8
Exfoliation in Granite
Figure 10.9
Exfoliation in Granite
Figure 10.9
Exfoliation in Granite
Figure 10.9
Chemical Weathering
Figure 10.10
Chemical Weathering
Spheroidal Weathering
Figure 10.11
Oxidation in Rock and Soil
Figure 10.12
Slope Mechanics and Form
Figure 10.3
Slope Mechanics and Form
Figure 10.3
Mass Movement Processes
• Mass Movement Mechanics – The role of slopes
• Classes of Mass Movements – Falls and avalanches – Landslide– Flow – Creep
• Human-Induced Mass Movements
Mass Movement Classes
Figure 10.19
Soil Creep
Soil Creep
Figure 10.23
Rockfall
Figure 10.7
Soil Creep, California
Madison River Landslide
Figure 10.18
Talus Slopes
Figure 10.20
Debris Avalanche,
Peru
Figure 10.21
Yungay, Peru, May 31, 1970
Colluvium, San Bernardino Mountains, California
Avalanche Chute, Colorado
Gros Ventre Slide, Wyoming
Figure 10.22
Figure 10.24
Scarification
Karst and Limestone Regions
Figure 10.13
Karst Topography
Figure 10.14
Sinkholes
Figure 10.15
Cavern Features
Figure 10.17
End of Chapter 10
Elemental Geosystems 5e
Robert W. ChristophersonCharles E. Thomsen
Mystery or Soil Creep?
Four Years’ Mass-Wasting, Bosnia
Four Years’ Mass-Wasting, Bosnia
• 100*40/2 cm2 = 2000 cm2 (4 years)
• = 500 cm2 /year
• Removed from 1 km slope per year = 500 cm2 /100,000 cm= 1 cm/200 yr= 5000 cm (50 m)/m.y. = 50m /m.y.
• A 1-m (100 cm) soil mantle yields 500 cm2 /year, so movement = 500 cm2 /year/100 cm= 5 cm/year
Mudflows, California
Urban Planning, San Diego
Avalanche Chute, Colorado
Landslide, Mount Saint Helens
Sherman Glacier, Alaska, March 27, 1964
Viaont, Italy, October 9, 1963
1800 people died.
Yungay, Peru, May 31, 1970
Yungay, Peru, May 31, 1970
Lituya Bay, Alaska, July 9, 1958
Lituya Bay, Before and
After
The Scour Line
The Highest Wave Ever Recorded
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