BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Modelling the Evolution of Elliptical Röthlisberger Channels - Is
 aac Brown (University of Cambridge)
DTSTART:20251112T130000Z
DTEND:20251112T140000Z
UID:TALK237307@talks.cam.ac.uk
CONTACT:Emma
DESCRIPTION:Subglacial water flow plays a critical role in basal sliding a
 nd\, consequently\, in glacier and ice-sheet dynamics. However\, modelling
  subglacial drainage elements and coupling these to the ice motion remains
  challenging. This study investigates the evolution of the basal ice–wat
 er interface by analysing heat and fluid flow in idealised englacial chann
 els. We extend the classical Röthlisberger model for circular channels to
  elliptical channel geometries. A hybrid turbulent–laminar melt scheme c
 aptures heat generation from both viscous and turbulent dissipation\, whil
 e a viscous flow law models the creep closure of the surrounding ice. We s
 olve for the flow and temperature profiles in elliptical channels\, findin
 g differential melting between the roof and walls of the channel. We find 
 that elliptical channels tend towards a circular shape when laminar meltin
 g dominates\, whilst the flow of ice tends to increase the eccentricity of
  the channel. A hybrid laminar-turbulent melt model permits variations in 
 the distribution of melting along the ice-water boundary and the existence
  of stable\, non-circular cross-sections. The analysis of these idealised 
 channels hints at possible simplifications to modelling subglacial drainag
 e networks\, and the dynamics of the evolving subglacial hydrological netw
 ork.\n
LOCATION:MR12
END:VEVENT
END:VCALENDAR