BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Two-phase-flow dynamics in ice sheets - Ian  Hewitt ()
DTSTART:20160216T143000Z
DTEND:20160216T153000Z
UID:TALK64711@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Co-author: Christian Schoof		(University of British Columbia) 
 <span><br><br>The dynamics of large ice sheets have many similarities with
  mantle and magma dynamics.   Polycrystalline material undergoes intense s
 hear and creep deformation\, slow evolution of grain structure\, and dissi
 pative heating that can cause partial melting.  The presence of melt (wate
 r) can enhance creep and facilitates sliding past bedrock and sediments\, 
 leading to extreme patterns of ice flow\, most clearly demonstrated in the
  Antarctic and Greenland ice streams.<br><span><br>In this talk I will rev
 iew this related application of the two-phase flow equations often used to
  describe melt in the mantle.  I will focus especially on polythermal ice\
 , when the quantities of interest are the heat and water content together 
 with their transport\, and on the subglacial drainage system\, which is th
 ought to exhibit channelized flow similar (perhaps) to the mantle.  Approx
 imations used in the ice-sheet literature will be discussed\, along with n
 umerical solution methods for the resulting models.   I will highlight ana
 logies and difference with mantle models.</span></span>
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR