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DOI	10.1038/s41561-019-0442-3
	Earth’s topographic relief potentially limited by an upper bound on channel steepness
	Hilley G.E.; Porder S.; Aron F.; Baden C.W.; Johnstone S.A.; Liu F.; Sare R.; Steelquist A.; Young H.H.
发表日期	2019
ISSN	17520894
卷号	12 期号:10
英文摘要	Rivers limit the maximum elevation of active mountain belts, control the coupling between climate and tectonic processes, and archive the pace and tempo of fault-related rock uplift rates. Topographic profiles along rivers in steep, non-glaciated landscapes have led many to posit that river incision rates vary as a power function of channel discharge and slope. We used 10Be abundance in river sands and topographic analysis to test this relationship in watersheds varying by four orders of magnitude in erosion rate (4.7 × 10–3–7.1 mm yr−1), and supplemented this with a global analysis of erosion rates and topography. Our data and analyses reveal that in steep, rapidly eroding landscapes, channel morphology does not scale with erosion rate as expected. Instead, river profiles reach a threshold steepness, which may provide a bound on the topographic relief of Earth. In this case, increases in channel length may limit topographic relief, as erosion rate becomes increasingly sensitive to small changes in channel slopes in steep landscapes. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	channel morphology; erosion rate; fault; mountain region; river channel; threshold; topography; uplift
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124589
作者单位	Department of Geological Sciences, Stanford University, Stanford, CA, United States; Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, United States; National Research Center for Integrated Disaster Risk Management (CIGIDEN) & Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Santiago, Chile; United States Geological Survey, Lakewood, CO, United States
推荐引用方式 GB/T 7714	Hilley G.E.,Porder S.,Aron F.,等. Earth’s topographic relief potentially limited by an upper bound on channel steepness[J],2019,12(10).
APA	Hilley G.E..,Porder S..,Aron F..,Baden C.W..,Johnstone S.A..,...&Young H.H..(2019).Earth’s topographic relief potentially limited by an upper bound on channel steepness.Nature Geoscience,12(10).
MLA	Hilley G.E.,et al."Earth’s topographic relief potentially limited by an upper bound on channel steepness".Nature Geoscience 12.10(2019).