Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1978-12-01 |
タイトル |
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言語 |
en |
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タイトル |
Measurements of Air Permeability and Elastic Modulus of Snow and Firn Drilled at Mizuho Station, East Antarctica |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Maeno, Norikazu
Narita, Hideki
Araoka, Kuniaki
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著者所属(英) |
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en |
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The Institute of Low Temperature Science, Hokkaido University |
著者所属(英) |
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en |
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The Institute of Low Temperature Science, Hokkaido University |
著者所属(英) |
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en |
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The Institute of Low Temperature Science, Hokkaido University |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
Air permeability and elastic modulus were measured for firn samples prepared from a 20-m pit and cores drilled to the depth of 147.5m at Mizuho Station in East Antarctica. Air permeability decreased and elastic modulus increased with increasing depth or density. Two distinct changes were found at densities of 550 and 730kg・m^<-3>, i.e. at porosities of 0.40 and 0.20,in the plots of air permeability and elastic modulus against density or porosity. The former change is explained by the alteration of the densification mechanicism from mechanical packing to plastic deformation of ice particles, and the latter by the attainment of an optimum configuration of ice bonding for air permeation and mechanical strength. Observed results are compared with the theoretical air permeability of an ideal snow, to which all polar snows are considered to approach in a long ageing period under high hydrostatic pressure and high homologous temperature. It is suggested that the optimum state, which is reached at the density of 730kg・m^<-3> or the porosity of 0.20,is that of snow in which air channels are mainly located at intersections of grain boundaries and some 30 percent of them are unblocked. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00733561 |
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue
巻 10,
p. 62-76,
発行日 1978-12
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