DOI: 10.1002/2017JF004466
Scopus记录号: 2-s2.0-85040067281
论文题名: Quasi-Steady Evolution of Hillslopes in Layered Landscapes: An Analytic Approach
作者: Glade R.C. ; Anderson R.S.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 1 起始页码: 26
结束页码: 45
语种: 英语
英文关键词: blocks
; hillslope
; hogback
; layered
; scarp
; steady state
英文摘要: Landscapes developed in layered sedimentary or igneous rocks are common on Earth, as well as on other planets. Features such as hogbacks, exposed dikes, escarpments, and mesas exhibit resistant rock layers adjoining more erodible rock in tilted, vertical, or horizontal orientations. Hillslopes developed in the erodible rock are typically characterized by steep, linear-to-concave slopes or “ramps” mantled with material derived from the resistant layers, often in the form of large blocks. Previous work on hogbacks has shown that feedbacks between weathering and transport of the blocks and underlying soft rock can create relief over time and lead to the development of concave-up slope profiles in the absence of rilling processes. Here we employ an analytic approach, informed by numerical modeling and field data, to describe the quasi-steady state behavior of such rocky hillslopes for the full spectrum of resistant layer dip angles. We begin with a simple geometric analysis that relates structural dip to erosion rates. We then explore the mechanisms by which our numerical model of hogback evolution self-organizes to meet these geometric expectations, including adjustment of soil depth, erosion rates, and block velocities along the ramp. Analytical solutions relate easily measurable field quantities such as ramp length, slope, block size, and resistant layer dip angle to local incision rate, block velocity, and block weathering rate. These equations provide a framework for exploring the evolution of layered landscapes and pinpoint the processes for which we require a more thorough understanding to predict their evolution over time. ©2017. 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/114732
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, University of Colorado, Boulder, CO, United States; Institute of Arctic and Alpine Research (INSTAAR), Boulder, CO, United States
Recommended Citation:
Glade R.C.,Anderson R.S.. Quasi-Steady Evolution of Hillslopes in Layered Landscapes: An Analytic Approach[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(1)