GEOG 1350 Lecture Notes - Lecture 5: Frank Slide, Crowsnest River, Clearcutting
9 Dec 2018
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Definition: downslope movements of rock or sediment as a result of gravity. Movement is classified as rapid if it can be detected by eye. This is based on 4 variables: mechanism of movement, type of material, amount of water present, speed of movement. Fall: rock or sediment dropping off the face of a cliff. Slide: downslope movements along a discrete 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. Involves rock rolling down a steep slope or falling through the air. In this mass movement, the failure plane is curved upwards. This mass movement is caused by flow mechanisms. 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:
