Please enable JavaScript.
Coggle requires JavaScript to display documents.
Ice Deformation Conclusions (Store Flow, Hubbard et al (Flow mechanism…
Ice Deformation Conclusions
Ice deforms slowly
as crystals reorient themselves wrt eachother
Glen's Flow Law
Models ice reasonably for many studies
esp huge IS flow away from margins
BUT HAS ITS LIMITATIONS
Flow = fastest @ surface
BUT ALSO,
greatest velocity variations @ surface
Net glacier movement
= internal def & basal motion
Harder to predict
Not necessarily small contributor
Usually assume ice deformation
= small contribution to glacier flow
Basal sliding
rapid sliding@ bed thought mostly responsible for flow
Hubbard et al found otherwise
Showed ice deformation comprises ~30% flow @ Store Glacier
i.e. 1/3 ice flow due to own weight
2/3 due to basal sliding
Store Flow
, Hubbard et al
Fast flowing tidewater glacier (900 m/yr)
Drilled through ~900 m ice using hot, highly pressurised water
Flow mechanism
30% ice def
~70% basal sliding
Important consideration in ice dynamic predictions
Shows ice deformation can contribute signif portion of ice motion
To accurately predict future ice dynamics
Need correct estimates
relative contribution each flow mechanism
All glaciers flow by ice def to some extent
∴ need to know:
Ice thickness
Surface gradient
Temp (rheology) of ice
To understand motion