| DOI: | 10.1038/ngeo3005
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| 论文题名: | Rapid post-seismic landslide evacuation boosted by dynamic river width |
| 作者: | Croissant T.; Lague D.; Steer P.; Davy P.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2017
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| 卷: | 10, 期:9 | | 起始页码: | 680
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| 结束页码: | 684
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| 语种: | 英语
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| Scopus关键词: | alluvial deposit
; bedrock
; earthquake magnitude
; extreme event
; landslide
; mass wasting
; river
; sediment transport
; submarine landslide
; timescale
; two-dimensional modeling
; uplift
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| 英文摘要: | Mass wasting caused by large-magnitude earthquakes chokes mountain rivers with several cubic kilometres of sediment. The timescale and mechanisms by which rivers evacuate small to gigantic landslide deposits are poorly known, but are critical for predicting post-seismic geomorphic hazards, interpreting the signature of earthquakes in sedimentary archives and deciphering the coupling between erosion and tectonics. Here, we use a new 2D hydro-sedimentary evolution model to demonstrate that river self-organization into a narrower alluvial channel overlying the bedrock valley dramatically increases sediment transport capacity and reduces export time of gigantic landslides by orders of magnitude compared with existing theory. Predicted export times obey a universal non-linear relationship of landslide volume and pre-landslide valley transport capacity. Upscaling these results to realistic populations of landslides shows that removing half of the total coarse sediment volume introduced by large earthquakes in the fluvial network would typically take 5 to 25 years in various tectonically active mountain belts, with little impact of earthquake magnitude and climate. Dynamic alluvial channel narrowing is therefore a key, previously unrecognized mechanism by which mountain rivers rapidly digest extreme events and maintain their capacity to incise uplifted rocks. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/105726
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Géosciences Rennes, OSUR, CNRS, Université de Rennes 1, Campus de Beaulieu, Rennes, France
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| Recommended Citation: | |
Croissant T.,Lague D.,Steer P.,et al. Rapid post-seismic landslide evacuation boosted by dynamic river width[J]. Nature Geoscience,2017-01-01,10(9)
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