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Monitoring of thermal contraction cracking at an ice wedge site, central Spitsbergen
https://doi.org/10.15094/00003057
https://doi.org/10.15094/000030571221f4e5-3781-42db-8009-13a2e0cfa71b
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000044174 (1.7 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 1999-10-01 | |||||
タイトル | ||||||
タイトル | Monitoring of thermal contraction cracking at an ice wedge site, central Spitsbergen | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ice wedge | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | thermal constraction crack | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | permafrost | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | field measurement | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Svalbard | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003057 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Matsuoka, Norikazu
× Matsuoka, Norikazu |
|||||
著者所属(英) | ||||||
en | ||||||
Institute of Geoscience, University of Tsukuba | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Thermal contraction cracking was monitored for two years in a continuous permafrost region. A dilatometer read the separation of a pair of benchmarks installed at both sides of an ice-wedge trough. The outputs were recorded in a data logger together with ground temperatures at various depths. Widening of the trough was insignificant during the warmer first winter, while several significant events occurred during the colder second winter. The amount of widening reflected the magnitude of cooling. The maximum widening in the second winter corresponded to the most severe cooling in early February, during which the frozen active layer experienced significant creep, possibly accompanied by cracking. The ground temperature data were analyzed on the basis of a viscoelastic model, which shows that horizontal tensile stress is favored by higher cooling rates and colder ground. The predicted maximum stress at the ground surface and at the permafrost table, which was reached during the maximum widening event, is of the same order of magnitude as the tensile strengths of typical frozen soils and polycrystalline ice, respectively. Consequently, the ground thermal regime during this event was capable of cracking both the frozen active layer and the ice wedge. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1130866X | |||||
書誌情報 |
Polar geoscience 巻 12, p. 258-271, 発行日 1999-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |