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Basal Sliding (Enhanced plastic def (Proportional to
bedrock obstacle…
Basal Sliding
Basal Sliding Processes
- Enhanced plastic deformation
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Only process capable of causing dramatic variability basal sliding rates on short timescales (weeks/seasonal)
1. Enhanced Plastic Def
As ice flows/deforms over this rough bed,
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Regelation Process
- Ice deforming downhill hits a bedrock bump
- Stoss - enhanced stresses
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- Refreezing releases latent heat
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Regelation importance
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As ice refreezes, water incorporates erosion products @ bed into ice
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