EPS 80 Lecture Notes - Lecture 9: Coastal Hazards, Beach Nourishment, Earthflow
15 Nov 2017
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Document Summary
The downhill movement of loose material driven by gravity. When gravitational force tangential to surface is greater than the opposing frictional force, mass movement occurs. When gt is greater objects move more easily (steeper slope = greater gt) Less cohesive, as more water causes lubrication and loose grains of sediment to move. More cohesive, causes stickiness in sand particles. Nature of material can cause difference in the ability to be locked together , depending on its size. Bigger the particles are, the steeper the particles will be locked together. Presence of vegetation, tree roots in the ground will increase the frictional effect, because the roots are stuck in the ground, helping to decrease the likelihood of mass movements. Absence of vegetation increases likelihood of mass movements. Decreases frictional effect and causes loose material to scatter and fall. Type of motion - fall, slide, flow. Solid piece of rock (one block or series of blocks)
