ERTH 2415 Lecture Notes - Lecture 11: Saint Lawrence River, Earthflow
19 Jun 2015
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Erth 2415 lecture 11 mass movements 2: rotational slides slide in which failure occurs on an over steepened slope, along a concave rupture surface. Are caused due to wave erosion and road cuts: flows mass movement involving continuous internal deformation of the moving material. Slides have little deformation within the moving material whereas in flows the moving material is thoroughly deformed. Two main types of flows, depends on their velocity: slow creep, fast rock, debris or earth flow. Creep slow, gradual movement of earth and debris downhill. Soils rich in swelling clays have a greater tendency to experience creep because of the expansion and contraction behaviour of clays. Rock, debris, earth flows mixture of rock fragments, soil and water flowing as viscous fluid. They are generally confined to pre-existing channels, often occur in relation with heavy rain or sudden snowmelt. The fractures are parallel to the plane of weakness.
