Open access
Author
Date
2016-11-25Type
- Journal Article
ETH Bibliography
yes
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Abstract
We develop a posteriori ‘mechanical’ error estimators that are able to evaluate the solution discrepancy between two ice flow models. We first reformulate the classical shallow ice flow models by applying simplifications to the weak formulation of the Glen–Stokes model. This approach leads to a unified hierarchical formulation which relates the Glen–Stokes model, the Blatter model, the shallow ice approximation and the shallow shelf approximation. Based on this formulation and on residual techniques commonly used to estimate numerical errors, we derive three a posteriori estimators, each of which compares a pair of models using measures of the velocity field from the simpler (shallower) model. Numerical experiments confirm that these estimators can be used to assess the validity of the shallow ice models that are commonly used in glacier and ice sheet modelling. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000122284Publication status
publishedExternal links
Journal / series
Journal of Fluid MechanicsVolume
Pages / Article No.
Publisher
Cambridge University PressSubject
Ice sheets; Non-Newtonian flows; Variational methodsOrganisational unit
08726 - Funk, Martin (Tit.-Prof.)
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.More
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ETH Bibliography
yes
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