Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016GL072050 |
Thermo-cryogenic controls of fracture kinematics in permafrost rockwalls | |
Draebing, D.1; Krautblatter, M.1; Hoffmann, T.2 | |
2017-04-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Thermo-cryogenic processes prepare and trigger rockfalls and rockslides in alpine environments. Temporal occurrence, controls, and applied stresses of Thermo-cryogenic processes on rock masses are poorly understood. This paper reports annual crackmeter measurements with 3 h resolution across perennially ice-filled fractures in an unstable rock permafrost crestline. Thermo-cryogenic processes are controlled by snow cover onset and duration. Thermal changes in snow-free periods control expansion and contraction coincident temperature gradients on a daily to seasonal scale. We can show how snow cover promotes sustained temperatures from -9 to -1 degrees C and boosts ice segregation-related fracture opening up to 1 cm in 8 months. During snowmelt, meltwater induces ice erosion and ice relaxation, which occur in the freeze-thaw window close to the thawing point. We hypothesize that Thermo-cryogenic processes and their cyclic repetition can lead to Thermo-cryogenic fatigue preparing rock slope failure and can control type and location of rockfalls in a changing climate. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401847500013 |
WOS关键词 | ROCK SLOPE INSTABILITY ; SWISS ALPS ; SUBZERO TEMPERATURE ; TENSILE-STRENGTH ; SNOW COVER ; EROSION ; TIME ; MODEL ; TOUGHNESS ; VARIABILITY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27110 |
专题 | 气候变化 |
作者单位 | 1.Tech Univ Munich, Landslide Res Grp, Munich, Germany; 2.German Fed Inst Hydrol, Koblenz, Germany |
推荐引用方式 GB/T 7714 | Draebing, D.,Krautblatter, M.,Hoffmann, T.. Thermo-cryogenic controls of fracture kinematics in permafrost rockwalls[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(8). |
APA | Draebing, D.,Krautblatter, M.,&Hoffmann, T..(2017).Thermo-cryogenic controls of fracture kinematics in permafrost rockwalls.GEOPHYSICAL RESEARCH LETTERS,44(8). |
MLA | Draebing, D.,et al."Thermo-cryogenic controls of fracture kinematics in permafrost rockwalls".GEOPHYSICAL RESEARCH LETTERS 44.8(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论