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Hot water drilling and glaciological observations at the terminal part of Rhonegletscher, Switzerland in 2007

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Title: Hot water drilling and glaciological observations at the terminal part of Rhonegletscher, Switzerland in 2007
Other Titles: スイス・ローヌ氷河末端付近において2007 年に実施された熱水掘削と氷河観測
Authors: SUGIYAMA, Shin Browse this author →KAKEN DB
TSUTAKI, Shun Browse this author
NISHIMURA, Daisuke Browse this author
BLATTER, Heinz Browse this author
BAUDER, Andreas Browse this author
FUNK, Martin Browse this author
Issue Date: 2008
Publisher: The Japanese Society of Snow and Ice
Journal Title: Bulletin of Glaciological Research
Volume: 26
Start Page: 41
End Page: 47
Abstract: After the retreat of Rhonegletscher over a bedrock ridge, a proglacial lake has been forming at the glacier forefront since 2005. The lake and the glacier draw glaciological attention because the retreat may be accelerated by calving into the lake. As an initial investigation into studying the impact of the lake formation on the glacier, hot water drilling and preliminary observations were carried out at the terminal part of Rhonegletscher in the summer of 2007. Eight boreholes were drilled down to the bed and accurate ice thickness was determined from the borehole depth. The ice was 135m thick at a point 700m from the terminus and it gradually decreased downglacier. This observation revealed that the ice in this region was significantly thinner than previous estimation by an ice-radar survey. The water level in the 135-m borehole showed diurnal variations. The daily minima were steady during the study period at about 10m higher than the surface elevation of the proglacial lake. After injecting a water jet into the bottom of the borehole, fine sediment was observed in the upwelling water. At some of the other drilling sites, however, scratches on the drilling nozzle suggested that the ice was underlain by solid rock. Thus, it is likely that the glacier bed conditions are inhomogeneous. The rate of change in ice thickness from 2000 to 2007 was determined to be -2.8m a-1, which indicates that glacier thinning has accelerated in the 21st century.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉山 慎

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