DOI: 10.1038/ngeo2282
论文题名: Sediment supply as a driver of river meandering and floodplain evolution in the Amazon Basin
作者: Constantine J.A. ; Dunne T. ; Ahmed J. ; Legleiter C. ; Lazarus E.D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 12 起始页码: 899
结束页码: 903
语种: 英语
Scopus关键词: basin evolution
; cutoff wall
; floodplain
; Landsat
; meander
; satellite imagery
; suspended load
; Amazon Basin
英文摘要: The role of externally imposed sediment supplies on the evolution of meandering rivers and their floodplains is poorly understood, despite analytical advances in our physical understanding of river meandering. The Amazon river basin hosts tributaries that are largely unaffected by engineering controls and hold a range of sediment loads, allowing us to explore the influence that sediment supply has on river evolution. Here we calculate average annual rates of meander migration within 20 reaches in the Amazon Basin from Landsat imagery spanning 1985-2013. We find that rivers with high sediment loads experience annual migration rates that are higher than those of rivers with lower sediment loads. Meander cutoff also occurs more frequently along rivers with higher sediment loads. Differences in meander migration and cutoff rates between the study reaches are not explained by differences in channel slope or river discharge. Because faster meander migration and higher cutoff rates lead to increased sediment-storage space in the resulting oxbows, we suggest that sediment supply modulates the reshaping of floodplain environments by meandering rivers. We conclude that imposed sediment loads influence planform changes in lowland rivers across the Amazon. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106465
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: School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom; Bren School of Environmental Science and Management, University of California-Santa Barbara, Santa Barbara, CA, United States; Department of Earth Science, University of California-Santa Barbara, Santa Barbara, CA, United States; Department of Geography, University of Wyoming, Laramie, Wyoming, United States
Recommended Citation:
Constantine J.A.,Dunne T.,Ahmed J.,et al. Sediment supply as a driver of river meandering and floodplain evolution in the Amazon Basin[J]. Nature Geoscience,2014-01-01,7(12)