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: T27.00002 : Thickness of pro-glacial mélange impacts calving dynamics of Greenland glaciers
4:38 PM–4:51 PM
Presenter:
Yue Meng
(Stanford University, Department of Geophysics)
Authors:
Yue Meng
(Stanford University, Department of Geophysics)
Riley Culberg
(Cornell University, Department of Earth and Atmospheric Sciences)
Michael Shahin
(The University of Kansas, Department of Geology)
Leigh Stearns
(The University of Kansas, Department of Geology)
Justin C Burton
(Emory University, Department of Physics)
Nissanka Kavinda
(Emory University, Department of Physics)
Ching-Yao Lai
(Stanford University, Department of Geophysics)
To quantify the mélange buttressing force on the glacier terminus, we develop a continuum theory that reveals the scaling between the buttressing force and the mélange thickness. We also develop a three-dimensional discrete element model (DEM) that simulates a moving terminus pushing against a collection of cubic icebergs with a pow-law size distribution. Varying the mélange thickness, we retrieve corresponding steady-state buttressing forces and validate the proposed scaling law. Our results show that to provide effective buttressing, the averaged mélange thickness at the terminus must be larger than 145 meters. We further validate the thickness threshold by remote sensing data.
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