A double continuum hydrological model for glacier applications

B. de Fleurian*, O. Gagliardini, T. Zwinger, G. Durand, E. Le Meur, D. Mair, P. Raback

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Citations (Scopus)
5 Downloads (Pure)

Abstract

The flow of glaciers and ice streams is strongly influenced by the presence of water at the interface between ice and bed. In this paper, a hydrological model evaluating the subglacial water pressure is developed with the final aim of estimating the sliding velocities of glaciers. The global model fully couples the subglacial hydrology and the ice dynamics through a water-dependent friction law. The hydrological part of the model follows a double continuum approach which relies on the use of porous layers to compute water heads in inefficient and efficient drainage systems. This method has the advantage of a relatively low computational cost that would allow its application to large ice bodies such as Greenland or Antarctica ice streams. The hydrological model has been implemented in the finite element code Elmer/Ice, which simultaneously computes the ice flow. Herein, we present an application to the Haut Glacier d'Arolla for which we have a large number of observations, making it well suited to the purpose of validating both the hydrology and ice flow model components. The selection of hydrological, under-determined parameters from a wide range of values is guided by comparison of the model results with available glacier observations. Once this selection has been performed, the coupling between subglacial hydrology and ice dynamics is undertaken throughout a melt season. Results indicate that this new modelling approach for subglacial hydrology is able to reproduce the broad temporal and spatial patterns of the observed subglacial hydrological system. Furthermore, the coupling with the ice dynamics shows good agreement with the observed spring speed-up.

Original languageEnglish
Pages (from-to)137-153
Number of pages17
JournalThe Cryosphere
Volume8
Issue number1
DOIs
Publication statusPublished - 2014

Keywords

  • subglacial water-pressure
  • high-velocity event
  • ice-sheet
  • drainage system
  • temperature glaciers
  • seasonal-changes
  • basal motion
  • Switzerland
  • flow
  • darolla

Cite this

de Fleurian, B., Gagliardini, O., Zwinger, T., Durand, G., Le Meur, E., Mair, D., & Raback, P. (2014). A double continuum hydrological model for glacier applications. The Cryosphere, 8(1), 137-153. https://doi.org/10.5194/tc-8-137-2014

A double continuum hydrological model for glacier applications. / de Fleurian, B.; Gagliardini, O.; Zwinger, T.; Durand, G.; Le Meur, E.; Mair, D.; Raback, P.

In: The Cryosphere, Vol. 8, No. 1, 2014, p. 137-153.

Research output: Contribution to journalArticle

de Fleurian, B, Gagliardini, O, Zwinger, T, Durand, G, Le Meur, E, Mair, D & Raback, P 2014, 'A double continuum hydrological model for glacier applications', The Cryosphere, vol. 8, no. 1, pp. 137-153. https://doi.org/10.5194/tc-8-137-2014
de Fleurian B, Gagliardini O, Zwinger T, Durand G, Le Meur E, Mair D et al. A double continuum hydrological model for glacier applications. The Cryosphere. 2014;8(1):137-153. https://doi.org/10.5194/tc-8-137-2014
de Fleurian, B. ; Gagliardini, O. ; Zwinger, T. ; Durand, G. ; Le Meur, E. ; Mair, D. ; Raback, P. / A double continuum hydrological model for glacier applications. In: The Cryosphere. 2014 ; Vol. 8, No. 1. pp. 137-153.
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