Depth-varying constitutive properties observed in an isothermal glacier

被引:13
|
作者
Marshall, HP
Harper, JT
Pfeffer, WT
Humphrey, NF
机构
[1] Univ Colorado, Inst Arctic & Alpine Res, Dept Civil Environm & Architectural Engn, Boulder, CO 80309 USA
[2] Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA
关键词
D O I
10.1029/2002GL015412
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] Detailed three-dimensional in-situ measurements of deformation at depth are used to examine the rheology of a 6 x 10(6) m(3) 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 similar to 115 m depth suggest a constitutive relationship with a stress exponent n similar to 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.
引用
收藏
页码:61 / 1
页数:4
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