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Basal Sliding Msmt (Borehole Inclinometer (Gives def profile (e.g. of…
Basal Sliding Msmt
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Basal sliding msmt
- Infer from surface velocity surveys
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Drag Spools
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- 'Dexion' bolted to bedrock @ glacier margin
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- As ice moves away, it unravels spool of twine
- Monitor attached to spool → generates potential
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A. Downhole camera
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As glacier moves, camera = advected over bedrock
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Borehole Inclinometer
- Cable inserted down borehole
- Sensors measure angle of borehole wrt vertical
- Sum of angle ∆s in each direction = measured
→ Gives shape of borehole @ given time
Gives def profile
e.g. of total ~10 m motion
~40% internal def, ~60% basal sliding
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