DOI: 10.1038/ngeo2773
论文题名: Fluvial bevelling of topography controlled by lateral channel mobility and uplift rate
作者: Bufe A. ; Paola C. ; Burbank D.W.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 9 起始页码: 706
结束页码: 710
语种: 英语
Scopus关键词: alluvial deposit
; bedrock
; canyon
; channel flow
; erosion rate
; foreland basin
; geomorphological response
; landscape evolution
; topographic mapping
; uplift
; Tien Shan
英文摘要: Valley morphologies of rivers crossing zones of active uplift range from narrow canyons to broad alluvial surfaces. They provide illuminating examples of the fundamental, but poorly understood, competition between relief creation and landscape flattening. Motivated by a field example of abandoned kilometre-wide, fluvially eroded platforms on active detachment folds in the Tian Shan foreland, we present physical experiments investigating the controls on the area of a growing fold that is reworked by antecedent rivers. These experiments reproduce the range of observed field morphologies, varying from wholesale bevelling of the uplifting fold to the formation of narrow, steep-walled canyons. A log-linear fit to a simple dimensionless parameter shows that the competition between lateral channel mobility and rock-uplift rate explains >95% of the variance in the bevelled fraction of the folds. Our data suggest that lateral bedrock erosion rates of 0.5-40 m yr â '1 are required to explain the formation of extensive platforms in the Tian Shan foreland and imply that varying water and sediment fluxes can cause striking changes in the degree of landscape flattening by influencing the lateral erosion rate. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105934
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, University of California, Santa Barbara, CA, United States; Department of Earth Sciences, University of Minnesota, Twin Cities, MI, United States
Recommended Citation:
Bufe A.,Paola C.,Burbank D.W.. Fluvial bevelling of topography controlled by lateral channel mobility and uplift rate[J]. Nature Geoscience,2016-01-01,9(9)