• Corpus ID: 240288831

The drainage of glacier and ice sheet surface lakes

  title={The drainage of glacier and ice sheet surface lakes},
  author={Christian Schoof and Sue Cook and Bernd Kulessa and Sarah S. Thompson},
Supraglacial lakes play a central role in storing melt water, enhancing surface melt, and ultimately in driving ice flow and ice shelf melt through injecting water into the subglacial environment and facilitating fracturing. Here, we develop a model for the drainage of supraglacial lakes through the dissipation-driven incision of a surface channel. The model consists of the St Venant equations for flow in the channel, fed by an upstream lake reservoir, coupled with an equation for the evolution… 



Modelling channelized surface drainage of supraglacial lakes

Abstract Supraglacial lakes can drain to the bed of ice sheets, affecting ice dynamics, or over their surface, relocating surface water. Focusing on surface drainage, we first discuss observations of

Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet

Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing

Greenland supraglacial lake drainages triggered by hydrologically induced basal slip

The results imply that as lakes form in less crevassed, interior regions of the ice sheet, where water at the bed is currently less pervasive, the creation of new surface-to-bed conduits caused by lake-draining hydro-fractures may be limited.

Drainage of a glacial lake through an ice spillway

Debris cover on glacier surfaces forms topography that can trap water in surface lakes. Such lakes may overflow and drain by melting a gorge through a low point in the ice barrier. If the spillway

Canals under sediment-based ice sheets

  • F. Ng
  • Environmental Science
    Annals of Glaciology
  • 2000
Abstract Classical theories of channelized subglacial drainage identify a melting vs creep balance at the channel-ice boundary that is crucial in determining its steady flow properties, but this

Cascading lake drainage on the Greenland Ice Sheet triggered by tensile shock and fracture

A 3D model is used to demonstrate that supraglacial lakes in Greenland drain when fractures form, causing a chain reaction in which cascading lake drainages extend inland and deliver water to previously isolated regions of the bed.

Evolution of the subglacial drainage system beneath the Greenland Ice Sheet revealed by tracers

Predictions of the Greenland Ice Sheet’s response to climate change are limited in part by uncertainty in the coupling between meltwater lubrication of the ice-sheet bed and ice flow1, 2, 3. This

Modeling oscillations in connected glacial lakes

Abstract Mountain glaciers and ice sheets often host marginal and subglacial lakes that are hydraulically connected through subglacial drainage systems. These lakes exhibit complex dynamics that have

Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage

The rapid (<2 hours) drainage of a large supraglacial lake down 980 meters through to the bed of the Greenland Ice Sheet initiated by water-driven fracture propagation evolving into moulin flow coincided with increased seismicity, transient acceleration, ice-sheet uplift, and horizontal displacement.

Evolution of drainage system morphology at a land‐terminating Greenlandic outlet glacier

The influence of meltwater on the dynamics and geomorphic impact of the Greenland Ice Sheet is strongly controlled by the morphology of the ice sheet's drainage system. However, this system and its