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Lecture 5

ENSC 2001 Lecture Notes - Lecture 5: Earthflow, Slope Stability, Debris Flow

Environmental Science
Course Code
ENSC 2001
Quentin Gall

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ENSC 2001 A
Lecture 5
October 19th, 2015
Exam room 340
Landslides and Subsidence
1. 1903 Frank Landslide in Canada best known landslide and a classic example of rock avalanche
Slope Processes
2. Convex slope at the top, you get slow movement of material
3. Free face (cliff) most likely to form in a semi erred region, weathering and erosion
4. Talus slope (rock fall deposits)
5. Straight slope
6. Concave slope water transported material to the base
Types of Landslides
1. Type of movement:
1. Falls: rock falling from a cliff face and accumulates at the base
2. Slides: consolidated material can slide down slope movement, material falling down on a failure
3. Rotational
4. Flows: debris flow, earth flow. Particles are moving in a semi-independent way, where the
particles in the material are all moving independently
5. Type of material
6. Amount of water and
7. Velocity
8. Examples of Landslides: Guatemala landslide, High rainfall in Portugal
Slope Stability
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