Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL083955 |
Controls on Eolian Landscape Evolution in Fractured Bedrock | |
Perkins, Jonathan P.1; Finnegan, Noah J.2; de Silva, Shanaka L.3; Willis, Michael J.4 | |
2019-11-08 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:21页码:12012-12020 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Wind abrasion is important for planetary landscape evolution, and wind-abraded bedrock landscapes contain many landforms that are difficult to interpret. Here we exploit a natural experiment in Chile where topographic shielding by an upwind lava flow yields diverse erosional landforms in a downwind ignimbrite. Using a 3-D topographic wind model, we find that low velocities in the wake of a lava lobe coincide with a transition from landforms reflecting fracture-parallel erosion to flow-parallel erosion. Erosion rates across these landforms vary with shear velocity and abrasion susceptibility of the windward escarpment. We hypothesize that this morphologic threshold is controlled by whether particles can be lofted in suspension and overcome topographic steering imposed by fractured bedrock blocks. Within a phase space set by Rouse and Stokes numbers, our data illustrate that wind-abraded landforms reflect a competition between the material skeleton of the landscape and the strength of the flow that shapes it. |
英文关键词 | wind erosion planetary landscape evolution geomorphology Atacama |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000495178900001 |
WOS关键词 | WIND ; ALTIPLANO ; PARTICLES ; CLIMATE ; ORIGIN ; CHILE ; AGES |
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/224980 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.US Geol Survey, Geol Minerals Energy & Geophys Sci Ctr, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 2.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA; 3.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 4.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Perkins, Jonathan P.,Finnegan, Noah J.,de Silva, Shanaka L.,et al. Controls on Eolian Landscape Evolution in Fractured Bedrock[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(21):12012-12020. |
APA | Perkins, Jonathan P.,Finnegan, Noah J.,de Silva, Shanaka L.,&Willis, Michael J..(2019).Controls on Eolian Landscape Evolution in Fractured Bedrock.GEOPHYSICAL RESEARCH LETTERS,46(21),12012-12020. |
MLA | Perkins, Jonathan P.,et al."Controls on Eolian Landscape Evolution in Fractured Bedrock".GEOPHYSICAL RESEARCH LETTERS 46.21(2019):12012-12020. |
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