Item: "in-situ" measurements to test crocus meprapc tool
Title: "in-situ" measurements to test crocus meprapc tool
Proceedings: 2002 International Snow Science Workshop, Penticton, British Columbia
Authors: Cecile Coieou, Gerald Giraud and Yves Lejeune, MeteD-France, Centre d'Etudes de la Neige
Abstract: Since the 1999/2000 winter season, the Snow Research Centre ofMeteo-France (CEN) has carried out various snow measurements in a new observation site. This site named "Col de La Botte" is located near the Chamrousse Olympic ski resort in the Belledonne massif. The study slopes varied between 35 to 40 degrees inclination, with north and west aspects for a main elevation of2150m. Snow measurements like : • complete and detailed snow pits (ram resistance, density, liquid water content, stratigraphy... ) • stability tests like rutschblock, shovel tests have been made with a frequency depending on the snow stability situation: Similar measurements were also conducted when avalanches were triggered by skiers. For us, the both main objectives ofthese measurements are: • better knowledge about the stability tests (carrying out in deep slopes and results interpretations) • validation of the stability analysis made by the Mepra expert system. Using CrocusMepraPC tool, some comparisons have been made between Mepra results and snowfield measurements (snow pack profile, Mepra avalanche risks, unstable levels..). To take into account the spatial variability of the snow pack, CrocusMepraPC is also used to simulate the field snow pits with modifications in the critical weak layers and in the overlying layer (mechanical properties, depth... ). Further Mepra snow stability consequences have been discussed.
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Keywords: snow stability, avalanche forecasting, computer tool, snow stratigraphy
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