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Theses

MODÉLISATION DE L'ECOULEMENT DES GLACIERS TEMPÉRÉS

Abstract : In this work, various aspects of glacier flow modelling are addressed.
The model developed by Le Meur and Vincent (2003) is used at different occasions. It is upgraded by switching to a semi-implicit scheme, mass conservation is improved and other shortcomings are resolved (ice-thickness that may become negative and an unrealistic ice settlement above the bergschrund).
A comparison between two different approaches for mass balance fields is performed on the St. Sorlin glacier (France) : mass balance from measurements and mass balance from a model. The future behaviour of the glacier under a climatic scenario is also predicted.
An intercomparison is done with the goal to determine the type of model that is the most appropriate for a given type of glacier geometry.
The models used are : the SIA model from Le Meur and Vincent (2003), the SIA model and the higher-order model from Pattyn (2003) and a Full Stokes model (Elmer). Different synthetic geometries are used as well as a real case. The synthetic tests show on the one hand the limits of the applicability of the SIA. On the other hand a rough comparison of CPU times shows the gain in CPU time. Conversely, the increase in CPU time turns out to be reduced when switching from a higher-order model to a Full Stokes model.The simulations on the St. Sorlin glacier give an insight into the validity of the SIA on this glacier. Even if the large-scale evolution is correctly reproduced, neither the velocity field nor some small structures in the surface geometry can be properly reproduced. Simulations are compared to observations for snout position and surface velocities.
A last chapter deals with the Cotopaxi glacier (Andes).
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https://tel.archives-ouvertes.fr/tel-00192512
Contributor : Martina Schäfer <>
Submitted on : Thursday, November 29, 2007 - 8:37:49 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 2:54:48 PM

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  • HAL Id : tel-00192512, version 2

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Martina Schäfer. MODÉLISATION DE L'ECOULEMENT DES GLACIERS TEMPÉRÉS. Sciences de la Terre. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00192512v2⟩

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