Geography 2152F/G Lecture Notes - Lecture 11: Malaria, Oseltamivir, Cholera
24 Apr 2014
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Snow avalanche downslope: definition: a mass of snow many cubic metres in volume that separates from a snowpack and flows, rocks, soil, ice, and debris can travel in a similar motion; however the term avalanche is generally reserved for snow, the intensity of the hazard is dependent on steepness, snow stability and weather, there are two types, an avalanche travelling as a coherent block. Weak layers crystals: wind, blowing snow can accumulate on the lee slope (downwind) of mountains, wind can deposit a layer of light snow crystals on a layer of more compacted snow, the boundary between the two layers could become a horizon along which failure could occur, hoar, layers of hoar have less strength than the rest of the snowpack, hoar can form deep in the snowpack (in air packets) or on the surface, hoar changes little over time; therefore overlying snow can leave the buried hoar as a weak layer.
