Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL081981 |
The Efficacy of Frost Weathering Processes in Alpine Rockwalls | |
Draebing, Daniel1,2; Krautblatter, Michael2 | |
2019-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:12页码:6516-6524 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Weathering processes prepare and trigger rockfall, which is a key agent of alpine landscape evolution and a hazardous process. The relative importance of different weathering processes is hard to decipher; nevertheless, current knowledge assumes a dominant role of frost cracking in eroding alpine rockwalls. This study uses a laboratory approach to simulate volumetric expansion and ice segregation in four alpine rock samples, monitors crack deformation, and quantifies frost weathering efficacy. Our results show that short-term volumetric expansion in cracks provides stresses up to 10 MPa over hours, while long-term ice segregation causes stresses of 1 MPa over days. While volumetric expansion in fall can reach critical fracture levels, volumetric expansion in early summer and ice segregation rather approaches subcritical fracture propagation levels. We conclude that subcritical crack propagation is the dominant antecedent process of rockfall initiation, which can be amplified by rare critical cracking due to volumetric expansion. |
英文关键词 | weathering frost cracking subcritical cracking periglacial processes rockfall |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477616300041 |
WOS关键词 | ICE SEGREGATION ; ROCK ; FRACTURE ; EROSION ; BEDROCK ; VALLEY ; RATES ; ALPS |
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/184240 |
专题 | 气候变化 |
作者单位 | 1.Univ Bayreuth, Chair Geomorphol, Bayreuth, Germany; 2.Tech Univ Munich, Chair Landslide Res, Munich, Germany |
推荐引用方式 GB/T 7714 | Draebing, Daniel,Krautblatter, Michael. The Efficacy of Frost Weathering Processes in Alpine Rockwalls[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6516-6524. |
APA | Draebing, Daniel,&Krautblatter, Michael.(2019).The Efficacy of Frost Weathering Processes in Alpine Rockwalls.GEOPHYSICAL RESEARCH LETTERS,46(12),6516-6524. |
MLA | Draebing, Daniel,et al."The Efficacy of Frost Weathering Processes in Alpine Rockwalls".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6516-6524. |
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