Depth-varying constitutive properties observed in an isothermal glacier

Details Depth-varying constitutive properties observed in an isothermal glacier Depth-varying constitutive properties observed in an isothermal glacier

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..61m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 61-1, CiteID 2146, DOI 10.1029/2002GL015412

Physics

Geophysics

5

Hydrology: Glaciology (1863), Hydrology: Snow And Ice (1827), Mathematical Geophysics: Modeling, Mathematical Geophysics: Nonlinear Dynamics, Global Change: General Or Miscellaneous

Scientific paper

Detailed three-dimensional in-situ measurements of deformation at depth are used to examine the rheology of a 6 × 106 m3 block of temperate glacier ice. Assuming that the viscosity of this ice is primarily dependent on stress, the relationship between inferred stress and measurements of strain-rate above ~115 m depth suggest a constitutive relationship with a stress exponent n ~ 1. Deformation below 115 m is described by a non-linear flow law with a power exponent of approximately 3-4. A sharp transition between the two flow regimes is likely caused by a change in the dominant mechanism from superplastic flow, basal slip, and/or diffusional flow near the surface to dislocation and intragranular deformation at depth.

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