Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1997-11-01 |
タイトル |
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タイトル |
ICE CRYSTAL ORIENTATION DISTRIBUTIONS IN LARGE ICE MASSES |
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 |
ID登録 |
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ID登録 |
10.15094/00003990 |
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ID登録タイプ |
JaLC |
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) |
記事種別(英) |
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en |
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ABSTRACT |
論文名よみ |
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その他のタイトル |
ICE CRYSTAL ORIENTATION DISTRIBUTIONS IN LARGE ICE MASSES |
著者名よみ |
ショウジ, ヒトシ
ミヤモト, アツシ
ナリタ, ヒデキ
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著者名(英) |
SHOJI, Hitoshi
MIYAMOTO, Atsushi
NARITA, Hideki
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著者所属(英) |
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en |
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Department of Civil Engineering, Kitami Institute of Technology |
著者所属(英) |
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en |
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Institute of Low Temperature Science, Hokkaido University |
著者所属(英) |
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en |
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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 |
Flow behavior of large ice sheets is affected mainly by c-axis orientation fabric, and the fabric formation is caused by the anisotropic characteristics in the plastic deformation property of ice crystal. There are three processes involved in fabric formation; i.e. crystal rotation (AZUMA and HIGASHI, 1985), recrystalization and polygonization. Two types of crystal fabric development with depth have been observed in deep polar ice cores. Type A shows crystal fabric changes from a random distribution near the surface to vertical cluster development with depth under vertical compression and to a strong single maximum pattern near the bottom under simple shear deformation (Camp Century, Dye 3,GRIP and Byrd ice cores). Type B shows fabric changes from a random distribution near the surface to a large girdle development with depth, where the c-axis direction is almost perpendicular to the uniaxial tensile strain axis along the ice flow direction (Mizuho and Vostok ice cores). To estimate vertical compressive strain, ε and uniaxial tensile strain, γ, the following equations were assumed : ε=-ln(y/H), γ=-2ln(y/H), where y is height from the bottom and H is ice thickness. For Type A cores, the c-axis lies mainly along the vertical core direction with depth and a single maximum fabric appears at depth for about ε=150%, except for Byrd core samples which shows single maximum fabric appearance for about ε=80%. For Type B cores, crystal fabrics developments with an increase in γ are quite similar to each other. |
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 |
AA10756213 |
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
巻 11,
p. 246,
発行日 1997-11
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出版者 |
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出版者 |
National Institute of Polar Research |