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A model for turbulent hydraulic fracture and application to crack propagation at glacier beds

Tsai, Victor C. and Rice, James R. (2010) A model for turbulent hydraulic fracture and application to crack propagation at glacier beds. Journal of Geophysical Research F, 115 (F3). Art. No. F03007. ISSN 0148-0227. doi:10.1029/2009JF001474.

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Glaciological observations of under-flooding suggest that fluid-induced hydraulic fracture of an ice sheet from its bed sometimes occurs quickly, possibly driven by turbulently flowing water in a broad sheet flow. Taking the approximation of a fully turbulent flow into an elastic ice medium with small fracture toughness, we derive an approximate expression for the crack-tip speed, opening displacement and pressure profile. We accomplish this by first showing that a Manning-Strickler channel model for resistance to turbulent flow leads to a mathematical structure somewhat similar to that for resistance to laminar flow of a power law viscous fluid. We then adapt the plane-strain asymptotic crack solution of Desroches et al. (1994) and the power law self-similar solution of Adachi and Detournay (2002) for that case to calculate the desired quantities. The speed of crack growth is shown to scale as the overpressure (in excess of ice overburden) to the power 7/6, inversely as ice elastic modulus to the power 2/3, and as the ratio of crack length to wall roughness scale to the power 1/6. We tentatively apply our model by choosing parameter values thought appropriate for a basal crack driven by the rapid drainage of a surface meltwater lake near the margin of the Greenland Ice Sheet. Making various approximations perhaps relevant to this setting, we estimate fluid inflow rate to the basal fracture and vertical and horizontal surface displacements and find order-of-magnitude agreement with observations by Das et al. (2008) associated with lake drainage. Finally, we discuss how these preliminary estimates could be improved.

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URLURL TypeDescription ItemSupporting Information
Tsai, Victor C.0000-0003-1809-6672
Additional Information:© 2010 American Geophysical Union. Received 4 August 2009; revised 23 November 2009; accepted 5 March 2010; published 20 July 2010. This research was supported by National Science Foundation OPP grant ANT‐0739444. We thank R. Hindmarsh and two anonymous reviewers for helpful comments.
Group:Seismological Laboratory
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Issue or Number:F3
Record Number:CaltechAUTHORS:20140612-072458326
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Official Citation:Tsai, V. C., and J. R. Rice (2010), A model for turbulent hydraulic fracture and application to crack propagation at glacier beds, J. Geophys. Res., 115, F03007, doi:10.1029/2009JF001474.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46222
Deposited By: Ruth Sustaita
Deposited On:12 Jun 2014 16:12
Last Modified:10 Nov 2021 17:22

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