DOI: 10.1029/2017JF004405
Scopus记录号: 2-s2.0-85050452200
论文题名: The Dynamics of Channel Slope, Width, and Sediment in Actively Eroding Bedrock River Systems
作者: Yanites B.J.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 7 起始页码: 1504
结束页码: 1527
语种: 英语
英文关键词: bedrock rivers
; channel width
; fluvial geomorphology
; landscape evolution
; sediment
; tectonic geomorphology
英文摘要: The evolution of rivers in eroding landscapes plays a key role in determining landscape relief and modulating climate-tectonic interactions. A common approach to quantifying river system evolution uses a one-dimensional, detachment-limited stream power equation. One potential drawback of this model is that it does not incorporate the effects of changes in channel width or the role of sediment transport dynamics. Here I present a new method for modeling the influence of channel width on river dynamics to explore how variable width and sediment transport impact river profile evolution. With this approach, vertical river erosion can operate based on any number of river erosion models, such as a simple shear stress model (e.g., detachment limited), sediment cover-shear stress hybrid models, or mechanistic saltation-abrasion models. I explore the sensitivity of these three models to increases in rock-uplift rate (i.e., 2, 3, 5, 10, and 20× increase). Generally, the results show that incorporating channel width adjustment or sediment transport dynamics lowers the sensitivity of a river profile to rock-uplift rate. For the sediment transport-dependent models, the degree of sensitivity depends on whether the system is limited by bedrock exposure or erosion potential (i.e., detachment potential). The approach produces transient responses that reveal distinct patterns of width and slope, which may provide valuable insight into the limiting physical mechanisms of bedrock erosion in a region. The implications of the work are broad and include the potential to distinguish underlying erosion controls from field observations of width and slope as well as understanding climate-tectonic interactions. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113555
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN, United States
Recommended Citation:
Yanites B.J.. The Dynamics of Channel Slope, Width, and Sediment in Actively Eroding Bedrock River Systems[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(7)