ATS1310 Study Guide - Midterm Guide: Soil, Extreme Weather, Debris Flow
9 Aug 2018
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Document Summary
Landslides form part of the wider group termed mass movements . Mass movements: downslope motion of large masses of soil, weathered debris, or rock: may be slow or very rapid, materials involved can be wet (mud) or dry (boulders, can fall, tumble, slide or flow. Slump: movement of rock debris down a slope. Can be numerous & widespread and seasonal (peaking in northern hemisphere summer monsoon rains) Dry gravity driven: driven rockfall/rockslide (tilted strata block has slipped and fallen) Suburban development extending into landslide - prone landscape. Steep hillslopes (generally, but not in all cases) Undercutting (often by waves, rivers, but also roads or mining) Heavy rainfall in the weeks or days before (saturates material - increases weight and thus downslope sliding) Clearing or removal of forest vegetation (loss of root strength no reinforcement to soil) Overloading of the hillslope (e. g. increasing weight/burden by buildings ) Dams and reservoirs (with new shorelines and wave action)
