DOI: 10.1016/j.earscirev.2020.103407
论文题名: Late-Pleistocene catchment-wide denudation patterns across the European Alps
作者: Delunel R. ; Schlunegger F. ; Valla P.G. ; Dixon J. ; Glotzbach C. ; Hippe K. ; Kober F. ; Molliex S. ; Norton K.P. ; Salcher B. ; Wittmann H. ; Akçar N. ; Christl M.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 211 语种: 英语
中文关键词: Catchment
; Cosmogenic nuclides
; Data compilation
; Denudation rates
; European Alps
; Geomorphology
; Surface uplift
英文关键词: catchment
; cosmogenic radionuclide
; denudation
; Pleistocene
; soil erosion
; soil stabilization
; topography
; Alps
; Europe
英文摘要: We compile detrital 10Be concentrations of Alpine rivers, representing the denudation rates pattern for 375 catchments across the entire European Alps. Using a homogeneized framework, we employ state-of-the-art techniques for inverting in-situ 10Be concentrations into denudation rates. From our compilation, we find that (i) while lithologic properties and precipitation/runoff do influence erosion mechanisms and rates at the scale of individual catchments and in some specific Alpine regions, such controls do not directly stand for the entire Alps, (ii) as also previously suggested, catchment-wide denudation rates across the entire European Alps closely follow first-order Alpine topographic metrics at the scale of individual catchments or selected Alpine sub-regions. However, in addition to previous local-scale studies conducted in the European Alps, our large-scale compilation highlights a functional relationship between catchment-wide denudation and mean catchment slope angle. Catchment-wide denudation positively correlates with mean catchment slope up to a threshold angle (25–30°). Above this threshold, any correlation between catchment-wide denudation and slope as well as other catchment metrics breaks apart. We can reconcile these systematic patterns by proposing a regional erosion model based on diffusive-transport laws for catchments located below the slope threshold angle. In oversteepened catchments situated above-threshold slopes, erosion is stochastic in nature, as glacial carving likely caused a partial decoupling between hillslope and fluvial domains with complex topographic relationships and sediment connectivity patterns. Finally, we identify a first-order positive relationship between modern geodetic rock uplift and catchment-wide denudation for the European Alps. The observed spatial pattern is highly variable and possibly reflects the surface response to deep geodynamic mechanisms prevailing in the different Alpine regions. We conclude that today's topography and geomorphic features of the entire Alps are the result of a millenial-scale geomorphic response to past glacial processes and active rock uplift, highlighting a link between external and internal drivers for mountain erosion. © 2020 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166052
Appears in Collections: 气候变化与战略
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作者单位: Institute of Geological Sciences, University of Bern, Switzerland; ISTerre, Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, Grenoble, 38000, France; Department of Earth Sciences, Montana State University, United States; Department of Geosciences, University of Tübingen, Germany; Laboratory of Ion Beam Physics, ETH Zurich, Zurich, 8093, Switzerland; Nagra, Hardstrasse 73, Wettingen, 5430, Switzerland; Laboratoire Géosciences Océan, UMR 6538, CNRS, IUEM, Place N. Copernic, Plouzané, 29280, France; Victoria University of Wellington, Wellington, New Zealand; University of Salzburg, Department of Geography and Geology, Hellbrunnerstrasse 34, Salzburg, 5020, Austria; German Research Centre for Geosciences GFZ, Earth Surface Geochemistry, Telegrafenberg, Potsdam, 14473, Germany
Recommended Citation:
Delunel R.,Schlunegger F.,Valla P.G.,et al. Late-Pleistocene catchment-wide denudation patterns across the European Alps[J]. Earth Science Reviews,2020-01-01,211