Subglacial drainage by groundwater–channel coupling, and the origin of esker systems: part II—theory and simulation of a modern system

G. Boulton, Rebecca Lunn, P. Vidstrand, S. Zatsepin

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The observations from Breidamerkurjo¨ kull reported in Part I are used as a basis for a theory of coupled channel/groundwater flow that suggests that the large scale geometry of the hydraulic system self-organises as a consequence of coupling between groundwater and channel flow. The pattern of channel/esker distribution is largely determined by winter conditions and the sedimentary characteristics of eskers are largely determined by summer conditions, when large discharges of surface meltwater penetrate to the bed in the terminal zone. A simulation model is developed to explore evolution of the channel/groundwater system during a period of glacier growth. It suggests that as the glacier grows, channel/esker frequencies will increase as will the proportion of the melt flux discharged by channel flow, that groundwater impacts can extend to depth, that low water-pressure bulbs will extend downwards beneath channels, that groundwater upwelling towards channels are strong enough to create widespread conditions for liquefaction and that pressure shocks can occur as the channel system reorganises itself.
LanguageEnglish
Pages1091–1105
Number of pages15
JournalQuaternary Science Reviews
Volume26
Issue number7-8
DOIs
Publication statusPublished - Apr 2007

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esker
Drainage
Groundwater
Glaciers
drainage
groundwater
Groundwater flow
groundwater flow
glaciers
Channel flow
simulation
channel flow
hydraulic systems
snowmelt
Liquefaction
simulation model
bulbs
simulation models
glacier
Hydraulics

Keywords

  • subglacial drainage
  • groundwater–channel coupling
  • esker systems
  • theory and simulation
  • modern system

Cite this

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abstract = "The observations from Breidamerkurjo¨ kull reported in Part I are used as a basis for a theory of coupled channel/groundwater flow that suggests that the large scale geometry of the hydraulic system self-organises as a consequence of coupling between groundwater and channel flow. The pattern of channel/esker distribution is largely determined by winter conditions and the sedimentary characteristics of eskers are largely determined by summer conditions, when large discharges of surface meltwater penetrate to the bed in the terminal zone. A simulation model is developed to explore evolution of the channel/groundwater system during a period of glacier growth. It suggests that as the glacier grows, channel/esker frequencies will increase as will the proportion of the melt flux discharged by channel flow, that groundwater impacts can extend to depth, that low water-pressure bulbs will extend downwards beneath channels, that groundwater upwelling towards channels are strong enough to create widespread conditions for liquefaction and that pressure shocks can occur as the channel system reorganises itself.",
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Subglacial drainage by groundwater–channel coupling, and the origin of esker systems: part II—theory and simulation of a modern system. / Boulton, G.; Lunn, Rebecca; Vidstrand, P.; Zatsepin, S.

In: Quaternary Science Reviews, Vol. 26, No. 7-8, 04.2007, p. 1091–1105.

Research output: Contribution to journalArticle

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AU - Lunn, Rebecca

AU - Vidstrand, P.

AU - Zatsepin, S.

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AB - The observations from Breidamerkurjo¨ kull reported in Part I are used as a basis for a theory of coupled channel/groundwater flow that suggests that the large scale geometry of the hydraulic system self-organises as a consequence of coupling between groundwater and channel flow. The pattern of channel/esker distribution is largely determined by winter conditions and the sedimentary characteristics of eskers are largely determined by summer conditions, when large discharges of surface meltwater penetrate to the bed in the terminal zone. A simulation model is developed to explore evolution of the channel/groundwater system during a period of glacier growth. It suggests that as the glacier grows, channel/esker frequencies will increase as will the proportion of the melt flux discharged by channel flow, that groundwater impacts can extend to depth, that low water-pressure bulbs will extend downwards beneath channels, that groundwater upwelling towards channels are strong enough to create widespread conditions for liquefaction and that pressure shocks can occur as the channel system reorganises itself.

KW - subglacial drainage

KW - groundwater–channel coupling

KW - esker systems

KW - theory and simulation

KW - modern system

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