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SUMMARY:Hydrofracture Propagation from Supraglacial Lake Drainage - Victor
  Tsai (CALTECH (California Institute of Technology))
DTSTART:20171207T090000Z
DTEND:20171207T100000Z
UID:TALK96328@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Seasonal melt that forms at the surface of the Greenland Ice S
 heet often eventually finds its way to the bed of the ice sheet\, where it
  can have a significant effect on ice sheet dynamics. However\, the way in
  which meltwater pathways from the surface to the bed are formed and maint
 ained is not well understood. In this presentation\, I will discuss the me
 chanics of hydrofracture\, through which initial surface-to-bed connection
 s are thought to be made. Hydrofracture of liquid water through its solid 
 phase has unique mechanics\, partly due to the low viscosity and turbulenc
 e of water\, the higher density of water than ice\, the melting of ice tha
 t occurs with viscous dissipation of turbulent energy\, and the viscoelast
 ic deformation of ice. A simplified model will be presented that describes
  the essential aspects of such hydrofracture\, and the implications for gl
 acier dynamics will be explained.
LOCATION:Seminar Room 1\, Newton Institute
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