Item: Modeling and validation of snow redistribution by wind
Title: Modeling and validation of snow redistribution by wind
Proceedings: Proceedings of the 2006 International Snow Science Workshop, Telluride, Colorado
Authors: G. Guyomarc'h, Y. Durand and L. Mérindol, Centre d'Études de la Neige – Météo-France CNRM, Grenoble, FRANCE
Abstract: As part of the effort of the Centre d'Etudes de la Neige - Météo-France (Snow Research Centre), for the improvement in modeling snow cover evolution and avalanche hazard forecasting, a numerical simulation of snow transport by the wind has been developed over the last years. This application is based on field measurements at a high altitude experimental site (2700 m) that leads: • Firstly, to improve the knowledge concerning wind speed thresholds according to the types of snow surface particles and to verify the mechanisms of snow transport in alpine environment, • To develop and to validate a first attempt of snow transport modeling based on the results of these previous studies and on a modeling of a refined wind field centered on the experimental site, • To use a Digital Elevation Model with a resolution of 45 m integrating the experimental site, in order to develop a 2D/3D version of the modeling. Then, the measurements carried out or recorded at the experimental site allow to validate the results of these last developments thanks to: • A horizontal profile (transect) of snow stakes along a part of the experimental site, • The determination of an "albedo map" of the snow cover around the site by analyzing digital geo-referenced images through a novel remote sensing technique adapted to our problem, • Additional measurements performed on a set of several points around the site, • The following through video records of the evolution of snow redistribution due to wind (erosion-accumulation areas) on the experimental site. This presentation will also focus on the difficulty to verify the results of 2D modeling of snow redistribution. The final purpose is to incorporate validated results of wind effects modeling on snow distribution into the operational chain Safran-Crocus-Mepra for avalanche risk forecasting.
Keywords: blowing snow, modeling, in-situ validation
Digital Abstract Not Available