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Subglacial drainage system changes of the Gulkana Glacier, Alaska: discharge and sediment load observations and modelling

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Title: Subglacial drainage system changes of the Gulkana Glacier, Alaska: discharge and sediment load observations and modelling
Authors: Kido, Daisaku Browse this author
Chikita, Kazuhisa A. Browse this author →KAKEN DB
Hirayama, Kenta Browse this author
Keywords: glacier-melt
suspended sediment
Gulkana Glacier
subglacial drainage system
tank model
Issue Date: 30-Jan-2007
Publisher: John Wiley & Sons
Journal Title: Hydrological Processes
Volume: 21
Issue: 3
Start Page: 399
End Page: 410
Publisher DOI: 10.1002/hyp.6364
Abstract: Hydrological characteristics of englacial and subglacial drainage systems in Gulkana Glacier, Alaska, were examined by analysing temporal variations of discharge and sediment load in the proglacial Phelan Creek in 2001. From data plots on semi-log paper, it appeared appropriate to separate both discharge and sediment load into fast and slow components. The two components were possibly produced by two different drainage systems: an englacial and subglacial, “channellized” system in the ablation zone, and a subglacial, “distributed” system in the accumulation zone. The data indicate the occurrence of an event during which part of the “distributed” drainage system changed into the “channellized” drainage system. The daily time-series of discharge and sediment load were represented using a tank model. In the model, the drainage from an additional tank was added, supposing that a subglacial reservoir full of water and sediment collapsed slowly when the subglacial drainage system changed from distributed to channellized. The simulation with the collapsed tank gave much more reasonable results than those with no collapsed tank. The contribution of the collapsed tank to total sediment load is 24%, which is much larger than 9% to total discharge. Copyright © 2006 John Wiley & Sons, Ltd.
Rights: Copyright © 2007 John Wiley & Sons, Inc., Hydrological Processes, Volume 21, Issue 3, Pages 399-410
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 知北 和久

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