GGR201H1 Chapter Notes - Chapter 5: Downhill Creep, Pore Water Pressure, Stress (Mechanics)
21 Feb 2017
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Document Summary
Mass wasting is a process which transports material down hillslopes without flowing water. Material moves because gravitational stress > slope strength. Disturbance regime is how intense and how frequently mass wasting (and other events) occur: directly impact what can live in an area. Colluvium is unsorted, (potentially) mobile hillslope material which sits on top of a more stable substrate. It is usually derived from the same material it sits on top of, but is altered through weathering. the unconsolidated material on hillslopes can be deposited by rivers (alluvium), glaciers (till), or wind (loess). Strength can be measured as compressive (resistance to being squeezed), shear ( the ability to resist shearing stress, or the sliding of one body over another), or tensile ( resistance to being pulled apart). Shear strength = cohesion + (effective normal stress)(tan(angle of. Basically, the angle of internal friction shows how much the friction between grains increases when they are put in closer contact.
