EARTHSC 2GG3 Lecture Notes - Lecture 3: Quick Clay, San Joaquin Valley, Fluidization
14 Jan 2016
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Document Summary
Downslope ground movement is a natural part of landscape evolution. Rocks may move slowly in a gradual process of creep - they can slide or roll downhill. This is catastrophic when a large volume of material moves downslope quickly. The ability of a slope to resist sliding depends on the total driving force (gravity) pulling it down vs. the resisting force holding it up the strength of the material and friction holding it in place. When a slope will fail depends on the slope steepness, the weight of the material, and the moisture content. Earth"s planar surface (the force keeping the boulder/grain from moving) This creates a balance between friction & gravity. Critical angle of repose: max angle at which sediment particles can stand without falling. Depends on: grain size; grain angularity, as rounded grains are smaller than angular grains; moisture content, as dry sediment is less stable than damp sediment, and oversaturated sediment becomes less stable.
