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Unformatted text preview: Page 1/6 GEOL 0820 Ramsey Natural Disasters Spring, 2011 LECTURE #14: Landslide Assessment, Mitigation and Case Studies Date: 3 March 2011 I. General Types (cont from last class): 3. flow: materials breaks up and moves as a viscous fluid (differential shearing) o no distinct basal plane o greatest velocity at upper surface o can be the wettest, driest, fastest and slowest types of landslides o falls & slides can undergo transitions to flows o flow types creep very slow movement of soil down slope tell-tale indicators most important in terms of total volume initiated: o freeze-thaw cycles o wetting-drying cycles o biological displacement soliflucation very slow movement of soil down slope water/ice saturated sediments most important in cold weather climates mud and debris flows rapid movement of soil and water water = ~ 30% total volume (mudflows) lahars, flash floods Page 2/6 debris avalanche unconsolidated debris moves rapidly down slope...
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This note was uploaded on 01/05/2012 for the course GEOL 0820 taught by Professor Ramsay during the Spring '08 term at Pittsburgh.
- Spring '08