DOI: 10.1016/j.epsl.2018.04.026
Scopus记录号: 2-s2.0-85046344502
论文题名: Criteria and tools for determining drainage divide stability
作者: Forte A.M. ; Whipple K.X.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 102
结束页码: 117
语种: 英语
英文关键词: drainage divides
; East Anatolia Plateau
; Greater Caucasus
; San Bernadino Mountains
; topographic analysis
Scopus关键词: Catchments
; Landforms
; MATLAB
; Rivers
; Anatolia
; Greater Caucasus
; Landscape analysis
; Landscape evolution simulations
; Landscape evolutions
; San Bernadino Mountains
; Spatiotemporal patterns
; Topographic analysis
; Stability criteria
; computer simulation
; drainage network
; erodibility
; fluvial geomorphology
; geomorphological response
; landscape evolution
; numerical model
; topography
; uplift
; watershed
; California
; Caucasus
; Coast Ranges
; Kars
; San Bernardino Mountains
; Turkey
英文摘要: Watersheds are the fundamental organizing units in landscapes and thus the controls on drainage divide location and mobility are an essential facet of landscape evolution. Additionally, many common topographic analyses fundamentally assume that river network topology and divide locations are largely static, allowing channel profile form to be interpreted in terms of spatio-temporal patterns of rock uplift rate relative to base level, climate, or rock properties. Recently however, it has been suggested that drainage divides are more mobile than previously thought and that divide mobility, and resulting changes in drainage area, could potentially confound interpretations of river profiles. Ultimately, reliable metrics are needed to diagnose the mobility of divides as part of routine landscape analyses. One such recently proposed metric is cross-divide contrasts in χ a proxy for steady-state channel elevation, but cross-divide contrasts in a number of topographic metrics show promise. Here we use a series of landscape evolution simulations in which we induce divide mobility under different conditions to test the utility of a suite of topographic metrics of divide mobility and for comparison with natural examples in the eastern Greater Caucasus Mountains, the Kars Volcanic Plateau, and the western San Bernadino Mountains. Specifically, we test cross-divide contrasts in mean gradient, mean local relief, channel bed elevation, and χ all measured at, or averaged upstream of, a reference drainage area. Our results highlight that cross-divide contrasts in χ only faithfully reflect current divide mobility when uplift, rock erodibility, climate, and catchment outlet elevation are uniform across both river networks on either side of the divide, otherwise a χ-anomaly only indicates a possible future divide instability. The other metrics appear to be more reliable representations of current divide motion, but in natural landscapes, only cross-divide contrasts in mean gradient and local relief appear to consistently provide useful information. Multiple divide metrics should be considered simultaneously and across-divide values of all metrics examined quantitatively as visual assessment is not sufficiently reliable in many cases. We provide a series of Matlab tools built using TopoToolbox to facilitate routine analysis. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109870
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, United States; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States
Recommended Citation:
Forte A.M.,Whipple K.X.. Criteria and tools for determining drainage divide stability[J]. Earth and Planetary Science Letters,2018-01-01,493