mass - Mass Wasting Definition Types of Mass movement Mass...

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Mass Wasting Definition Types of Mass movement: Mass movements are classified based on three criteria: (i) types of material moving (mainly loose vs. coherent), (ii) mechanism of movement, and (iii) velocity of movement (Table 1). Case A- Movement of loose unconsolidated sediments (arranged from slow to fast): 1- Creep: very slow (a few mm/yr), a form of flow. Water content of soil is very important. (Fig. 1). Repeated cycles of freezing – thawing and/or wetting – drying move the grains slowly downslope. Saturation with water has a similar effect. 2- Solifluction : Flow of soil. It is a form of creep in a way, but is promoted by the water in the soil prevented from infiltrating the ground, hence saturating the soil and causing it to flow. It is quite common in areas of permafrost occurring in the active layer above it (Fig. 2). 3- Flows : i) earthflow: movement of dry clay or silt. Very slow. (Fig. 3a) ii) mudflow: movement of water saturated mud downslope after periods of heavy rainfall in areas with sparse vegetation. (Fig. 3c).
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This note was uploaded on 02/27/2012 for the course GEOLOGY 110 taught by Professor Staff during the Fall '08 term at Marshall.

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mass - Mass Wasting Definition Types of Mass movement Mass...

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