DOI: 10.1002/2015GL065175
论文题名: A unified framework for stability of channel bifurcations in gravel and sand fluvial systems
作者: Bolla Pittaluga M. ; Coco G. ; Kleinhans M.G.
刊名: Geophysical Research Letters
ISSN: 0094-8587
EISSN: 1944-8318
出版年: 2015
卷: 42, 期: 18 起始页码: 7521
结束页码: 7536
语种: 英语
英文关键词: bifurcation
; delta
; morphodynamic
; river
; stability
Scopus关键词: Convergence of numerical methods
; Gravel
; Rivers
; Sand
; Stability
; Bifurcation stability
; Channel bifurcation
; Delta
; Environmental problems
; Fluvial systems
; Morphodynamic
; Natural landscapes
; Unified framework
; Bifurcation (mathematics)
; bifurcation
; delta
; fluvial landform
; gravel bed stream
; morphodynamics
; sand
; shield
英文摘要: Bifurcating rivers shape natural landscapes by distributing water and sediments on fluvial plains and in deltas. Symmetrical bifurcations were often found to be unstable so that one branch downstream of the bifurcation enlarged while the other dwindled. A unified theory able to predict bifurcation stability in both gravel bed and sand bed rivers is still lacking. Here we develop a new theory for the stability of bifurcations for the entire range of gravel bed to sand bed rivers. The theory indicates opposite behavior of gravel bed and sand bed rivers: we predict that symmetrical bifurcations are inherently stable for intermediate Shields stresses but are inherently unstable for the low and high Shields stresses found in the majority of rivers on Earth. In the latter conditions asymmetrical bifurcations are stable. These predictions are corroborated by observations and have ramifications for many environmental problems in fluviodeltaic settings. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945486537&doi=10.1002%2f2015GL065175&partnerID=40&md5=1c27363501ed446f8d9f2b864d9cf845
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8203
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Civil Chemical and Environmental Engineering, University of Genoa, Genoa, Italy
Recommended Citation:
Bolla Pittaluga M.,Coco G.,Kleinhans M.G.. A unified framework for stability of channel bifurcations in gravel and sand fluvial systems[J]. Geophysical Research Letters,2015-01-01,42(18).