DOI: 10.1002/2016GL071670
论文题名: Meander cutoffs nonlocally accelerate upstream and downstream migration and channel widening
作者: Schwenk J. ; Foufoula-Georgiou E.
刊名: Geophysical Research Letters
ISSN: 0094-8302
EISSN: 1944-8033
出版年: 2016
卷: 43, 期: 24 起始页码: 12437
结束页码: 12445
语种: 英语
英文关键词: channel width
; cutoff
; Landsat
; meander migration
; river equilibrium
; Ucayali River
Scopus关键词: Earth sciences
; Geophysics
; Channel widths
; Cutoff
; LANDSAT
; Meander migration
; Ucayali River
; Rivers
英文摘要: The hydrologic and sediment dynamics within and near cutoffs have long been studied, establishing them as effective agents of rapid local geomorphic change. However, the morphodynamic impact of individual cutoffs at the reachwide scale remains unknown, mainly due to insufficient observations of channel adjustments over large areal extents and at high temporal frequency. Here we show via annually resolved, Landsat-derived channel masks of the dynamic meandering Ucayali River in Peru that cutoffs act as perturbations that nonlocally accelerate river migration and drive channel widening both upstream and downstream of the cutoff locations. By tracking planform changes of individual meander bends near cutoffs, we find that the downstream distance of cutoff influence scales linearly with the length of the removed reach. The discovery of nonlocal cutoff influence supports the hypothesis of “avalanche”-type behavior in meander cutoff dynamics and presents new challenges in modeling and prediction of rivers' self-adjusting responses to perturbations. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007439397&doi=10.1002%2f2016GL071670&partnerID=40&md5=fddd2d59f01c80d07af0cc76a43ac852
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9265
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, Environmental and Geo-Engineering and Saint Anthony Falls Laboratory, University of Minnesota, Twin Cities, Minneapolis, MN, United States
Recommended Citation:
Schwenk J.,Foufoula-Georgiou E.. Meander cutoffs nonlocally accelerate upstream and downstream migration and channel widening[J]. Geophysical Research Letters,2016-01-01,43(24).