S11_GEOL_1001_Lecture_16

S11_GEOL_1001_Lecture_16 - MASS WASTING is the downhill...

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MASS WASTING is the downhill movement of soil or fractured rock under the force of gravity Material moves as a mass rather than being entrained via a transportation agent A debris avalanche covers portions of the Cascade Glacier, west of the Saint Elias Range in Alaska. The one pictured was the largest of several dozen triggered by a 1979 earthquake.
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The principal factors in mass movement are the strength (or weakness) of the material and the downslope component of gravity.
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Classification of Mass Wasting Types of mass wasting are classified based on: Rate of movement Wide range from < 1cm/year to >100 km/hour Type of material Did moving mass start out as solid bedrock or as debris (unconsolidated material at Earth’s surface) Type of movement Flow , slide , or fall
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Factors leading to an increase in shear force: 3. internal pressure e.g. pore water pressure pushes particles apart and of course angle of slope is very important 1. removal of support e.g. river cuts bank and steepens slope, weathering 1. forces of disturbance e.g. earthquake, human or animal interference
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Factors leading to an increase in shear strength: takes various forms: 1. friction, 2. water presence and 3. tree roots
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the stability of the surface material
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This note was uploaded on 05/10/2011 for the course GEOL 1001 taught by Professor Baksi during the Spring '07 term at LSU.

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S11_GEOL_1001_Lecture_16 - MASS WASTING is the downhill...

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