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- W4239334857 abstract "Abstract. We report on laboratory determinations of the shear resistance to sliding melting ice with entrained particles over a hard, impermeable surface. With higher particle concentrations and larger particle sizes, Coulomb friction at particle-bed contacts dominates and the shear stress increases linearly with normal load. We term this the sandy regime. When either particle concentration or particle size is reduced below a threshold, the dependence of shear resistance on normal load is no longer statistically significant. We term this regime slippery. We use force and mass balance considerations to examine the flow of melt water beneath the simulated basal ice. At high particle concentrations, the transition from sandy to slippery behavior occurs when the particle size is comparable to the thickness of the melt film that separates the sliding ice from its bed. For larger particle sizes, a transition from sandy to slippery behavior occurs when the particle concentration drops sufficiently that the normal load is no longer transferred completely to the particle–bed contacts. We estimate that the melt films separating the particles from the ice are approximately 0.1 μm thick at this transition. Our laboratory results suggest the potential for abrupt transitions in the shear resistance beneath hard-bedded glaciers with changes in either the thickness of melt layers or the particle loading." @default.
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- W4239334857 date "2007-06-29" @default.
- W4239334857 modified "2023-09-30" @default.
- W4239334857 title "Thresholds in the sliding resistance of simulated basal ice" @default.
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- W4239334857 doi "https://doi.org/10.5194/tcd-1-99-2007" @default.
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