Continuum mechanical modelling of the dissipative processes in the sediment-water layer below glaciers

International audience The solid mass of the saturated viscous, heat-conducting sediment-water layer below temperate glaciers grows by abrading the underlying rockbed. We propose to model this layer as a saturated mixture continuum of fluid and solid. We formulate its balance laws in volume and jump...

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Bibliographic Details
Main Authors: Dell'Isola, Francesco, Hutter, Kolumban
Other Authors: Dipartimento di Ingegneria Strutturale e Geotecnica, Università degli Studi di Roma "La Sapienza" = Sapienza University Rome (UNIROMA), Laboratorio Strutture e Materiali Intelligenti - Fondazione Tullio Levi-Civita, Cisterna di Latina, Institut für Mechanik, Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 1997
Subjects:
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]
Ice Sheet
Online Access:https://hal.archives-ouvertes.fr/hal-00501516
https://hal.archives-ouvertes.fr/hal-00501516/document
https://hal.archives-ouvertes.fr/hal-00501516/file/dellisola-hutter.pdf
Description
Summary:International audience The solid mass of the saturated viscous, heat-conducting sediment-water layer below temperate glaciers grows by abrading the underlying rockbed. We propose to model this layer as a saturated mixture continuum of fluid and solid. We formulate its balance laws in volume and jump local forms following e.g. Germain and Muller (1986). The water balance accounts for its drainage into the rockbed and the melting of ice within the overlaid ice sheet. Dissipation due to the power expended by stresses, the Darcy interaction force and sliding friction governs this thermomechanical system. Our analysis establishes that, contrary to what is stated in the literature, the listed dissipative mechanisms are all relevant.

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