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On the Sliding of Glaciers

  • J. Weertman (a1)

Abstract

A model is proposed to explain the sliding of any glacier whose bottom surface is at the pressure melting point. Two mechanisms are considered. One is pressure melting and the other is creep rate enhancement through stress concentrations. Neither of the mechanisms operating alone is sufficient to explain sliding. If both mechanisms operate together appreciable sliding can occur.

Résumé

On propose un modèle pour expliquer le glissement d’un glacier dont le fond se maintient au point de fusion. On considère deux mécanismes: le fusion de pression et l’augmentation de la vitesse de déformation causée par les concentrations de tension. Ni l’un ni l’autre en agissant seul ne suffit à expliquer le glissement. Mais ensemble ils occasionneraient un glissement assez important.

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Copyright

References

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1. Nye, J. F. The flow of glaciers and ice-sheets as a problem in plasticity. Proceedings of the Royal Society, Ser. A. Vol. 207, No. 1091, 1951, p. 55472.
2. Nye, J. F. The mechanics of glacier flow. Journal of Glaciology, Vol. 2, No. 12, 1952, p. 8293.
3. Nye, J. F. The flow law of ice from measurements in glacier tunnels, laboratory experiments and the Jungfraufirn borehole experiment. Proceedings of the Royal Society, Ser. A, Vol. 219, No. 1139, 1953, p. 47789.
4. Glen, J. W. The creep of polycrystalline ice. Proceedings of the Royal Society, Ser. A, Vol. 228, No. 1175, 1955, p. 51938.
5. Gerrard, J. A. F. Perutz, M. F. Roch, A. Measurement of the velocity distribution along a vertical line through a glacier. Proceedings of the Royal Society, Ser. A, Vol. 213, No. 1115, 1952, p. 54658.
6. McCall, J. G. The internal structure of a cirque glacier, report on the studies of englacial movements and temperatures. Journal of Glaciology, Vol. 2, No. 12, 1952, p. 12230.
7. Ward, W. H. Studies in glacier physics on the Penny Ice Cap, Baffin Island, 1953. Part 1V: The flow of Highway Glacier. Journal of Glaciology, Vol.2, No. 18, 1955, p. 59298.
8. Fermi, E. Thermodynamics. New York, Prentice-Hall, 1937, p. 68.
9. Robin, G. de, Q. Ice movement and temperature distribution in glaciers and ice sheets. Journal of Glaciology, Vol. 2, No. 18, 1955, p. 52332.
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Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
  • URL: /core/journals/journal-of-glaciology
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