08 Mass Movement

08 Mass Movement - (H) Mass Movement Mass movements (mass...

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(H) Mass Movement Mass movements (mass wasting) is a phenomena whereby geological materials are moved downslope from one place to another, without a transporting agent such as wind, water, or ice Landslides is a general term for rapid mass movement Mass movements occur when the shearing stress acting on rocks or soil exceeds the friction or shear strength (in case of cohesive solid) of the material to resist it Type of mass movements Flow Slide Fall Involving unconsolidated, non-cohesive material Rapid movements Earthflows: fairly dry soil Mudflows: soil saturated with water Snow avalanches Debris avalanche: when a wide variety of materials like soil, rocks, trees, etc. is incorporated in a single flow Fairly coherent unit of material slips downward along a clearly defined surface or plane Speed: highly variable Rockslides: movement along a bedding plane Soil slumps: movement of soil mass on a slip plane curved concave upward Free-falling action in which the moving material is not always in
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08 Mass Movement - (H) Mass Movement Mass movements (mass...

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