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SUMMARY:Free boundary problems in glacial hydrology - Dallaston\, M (Unive
 rsity of Oxford)
DTSTART:20140626T092000Z
DTEND:20140626T095000Z
UID:TALK53190@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Many aspects of a glaciers dynamics depend on the evolution of
  an interface between slowly creeping ice and fast flowing water. As ice c
 an be modelled as a very viscous fluid\, variations on free boundary Stoke
 s flow arise in the modelling of such interfaces.\n \nIn this talk I will 
 focus on the shape of a channel that is cut through or under the ice by vi
 scous dissipation of meltwater. Networks of these channels form a vital pa
 rt of a glaciers hydrological system\, which carries meltwater from the su
 rface to the glacier margin\, where mixing with dense ocean water has a st
 rong effect on melting at the ice face. The evolving cross section of the 
 channel is related to the problem of a contracting or expanding bubble in 
 two dimensional Stokes flow\, which allows us to derive analytic results. 
 I will also discuss the impact of a meltwater source\, such as a channel\,
  on the spatial distribution of melting at the ice face. \n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
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