Item: Isothermal metamorphism of a new snow layer: some measurements and simulation
Title: Isothermal metamorphism of a new snow layer: some measurements and simulation
Proceedings: Proceedings of the 2004 International Snow Science Workshop, Jackson Hole, Wyoming
Authors: Cécile Coléou, Romeu André Pieritz, Bernard Lesaffre, Jean-Bruno Brzoska and Pierre Etchevers, Météo-France, Centre d'Études de la Neige, FRANCE
Abstract: Snow layer evolution is numerically modelled by physical parameters and its grain structure description. The simulation result depends directly of the quality of these input data. This article presents some analysis of the shape descriptors based on a 3D data set obtained from an isothermal metamorphism experiment by X-ray microtomography. The results are compared to simulations from existing physically-based snow layer models. The numerical evolution of the snow densification is performed using CROCUS and SNTHERM algorithms and compared to the experimental thickness of the layers and the density obtained from the 3D data. The grain shape evolution is evaluated by the CROCUS model based on grain shape descriptors (dendricity, sphericity and size) and 2D optical microscopy methodology. The main 3D radius evolution is compared to 2D image data and confirms the potentiality of X-ray based geometry descriptors to future improvements in the numerical model parameters.
Keywords: snow modelling, isothermal metamorphism, 3d shape descriptors
Digital Abstract Not Available