FIRN DENSIFICATION BY GRAIN-BOUNDARY SLIDING

A FIRST MODEL.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

53 Citations (Scopus)

Abstract

Densification in highly porous, isothermal firn occurs primarily by Newtonian sliding on grain boundaries, but the coordination number increases with density and restricts further sliding. At a relative density of about 0. 6 the coordination number approaches 6 and sliding ceases to be a primary mechanism of densification; the resulting decrease in densification rate causes the critical point in depth-density profiles. A simple model for densification by boundary sliding yields a good fit to observed profiles. The viscosities so obtained give an activation energy equal to that for grain-boundary diffusion.

Original languageEnglish (US)
Title of host publicationJournal de Physique (Paris), Colloque
Pages249-256
Number of pages8
Volume48
Edition3
StatePublished - Mar 1987

Fingerprint

Grain boundary sliding
Densification
Grain boundaries
Activation energy
Viscosity

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Alley, R. B. (1987). FIRN DENSIFICATION BY GRAIN-BOUNDARY SLIDING: A FIRST MODEL. In Journal de Physique (Paris), Colloque (3 ed., Vol. 48, pp. 249-256)
Alley, Richard B. / FIRN DENSIFICATION BY GRAIN-BOUNDARY SLIDING : A FIRST MODEL. Journal de Physique (Paris), Colloque. Vol. 48 3. ed. 1987. pp. 249-256
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Alley, RB 1987, FIRN DENSIFICATION BY GRAIN-BOUNDARY SLIDING: A FIRST MODEL. in Journal de Physique (Paris), Colloque. 3 edn, vol. 48, pp. 249-256.

FIRN DENSIFICATION BY GRAIN-BOUNDARY SLIDING : A FIRST MODEL. / Alley, Richard B.

Journal de Physique (Paris), Colloque. Vol. 48 3. ed. 1987. p. 249-256.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Densification in highly porous, isothermal firn occurs primarily by Newtonian sliding on grain boundaries, but the coordination number increases with density and restricts further sliding. At a relative density of about 0. 6 the coordination number approaches 6 and sliding ceases to be a primary mechanism of densification; the resulting decrease in densification rate causes the critical point in depth-density profiles. A simple model for densification by boundary sliding yields a good fit to observed profiles. The viscosities so obtained give an activation energy equal to that for grain-boundary diffusion.

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Alley RB. FIRN DENSIFICATION BY GRAIN-BOUNDARY SLIDING: A FIRST MODEL. In Journal de Physique (Paris), Colloque. 3 ed. Vol. 48. 1987. p. 249-256