GEOG 1350 Lecture Notes - Lecture 4: Frank Slide, Clearcutting, Point Release
16 Jan 2017
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Document Summary
Downslope movements of rock or sediment as a result of gravity. Movement is classi ed as rapid if it can be detected by eye. Fall: rock or sediment dropping off the face of a cliff. Slide: downslope movement along a discrete (relatively straight) failure plane. Flow: movement of particles semi-independently of one another, commonly with the aid of water. This mass movement is caused by a fall mechanism. It involves rock rolling down a steep slope or calling through the air. In this mass movement the failure plane is curved upward. This mass movement is caused by a. Speed of movement ranges from a few millimetres to a metre annually. The stability of a slope is based on the balance between two types of forces. Driving forces: these move material downslope: they are based on the weight of the material from vegetation, water, etc. Resisting forces: these oppose downslope movement: they are based on the shear strength of the material.
