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Unformatted text preview: force Slope angle and topography
Gravity has a greater effect on the potential
downslope movement of material on steeper slopes driving
Increase the slope, increase the _______ force
Increase in slope angle 15 – 45o
d d 7 Factors affecting susceptibility toward
mass wasting - sand stick together when slightly damp, too much water =
too much friction/lubrication and sand slide past Water:
A little bit increases ________ (due to surface tension), too
much reduces friction (due to lubricating effect of free water).
Sand, for example sticks together is slightly damp but no
longer sticks together when saturated with water Climate:
Influences amount and timing of rain/snow
Controls infiltration of water into soil and erosion
8 - El Nino: due to oceanic circulation (convaerbelt system) Example showing the significance of water in
mass wasting processes - cool regions tend to get warm, lots of water coming down,
saturating materials, mud ﬂows, sweep everything up along way - once water gets into this, mud ﬂows come fast (without warming)
- high slope, materials weakened due to water Rainfall during El Nino years San Francisco Bay area
Climatic disturbances (such as El Nino) that warm normally cool regions (leading to
snow melt), or bring heavy rainfall to normally ___ regions can mean the saturation
of loose materials by water, leading to fluid behaviour (liquefaction) dry 9 3 Factors affecting susceptibility toward
mass wasting - vegetation/roots: like anchor, a...
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This document was uploaded on 02/25/2014.
- Fall '14