Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session T27: Geophysical Fluid Dynamics: Cryosphere II
4:25 PM–5:56 PM,
Monday, November 20, 2023
Room: 151B
Chair: Ching-Yao Lai, Stanford University, Department of Geophysics
Abstract: T27.00007 : Channelization of subglacial water flow: stability and channel distribution
5:43 PM–5:56 PM
Presenter:
Katarzyna Warburton
(Dartmouth College)
Authors:
Katarzyna Warburton
(Dartmouth College)
Colin R Meyer
(Dartmouth College)
Aleah N Sommers
(Dartmouth College)
We first perform a linear stability analysis of the distributed system, taking into account melting of the ice from both geothermal and dissipative heating, countered by the collapse of channels from the viscous flow of the ice above. We then consider the non-linear growth and eventual size of channels in the unstable case, and quantify the distributions of channels that develop beneath different glacier geometries. We find that subglacial water pressure initially increases with meltwater availability, but once the channelization threshold is reached, even small channels can efficiently drain water from the glacier bed.
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