DOI: 10.1016/j.earscirev.2019.102900
论文题名: From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River
作者: Guo L. ; Su N. ; Townend I. ; Wang Z.B. ; Zhu C. ; Wang X. ; Zhang Y. ; He Q.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 197 语种: 英语
中文关键词: Changjiang
; Sediment load
; Sediment starvation
; Source-to-sink
英文关键词: bedload
; debris flow
; eolian deposit
; erosion
; headwater
; sediment transport
; source-sink dynamics
; China
; Yangtze River
英文摘要: Many large rivers in the world delivers decreasing sediment loads to coastal oceans owing to reductions in sediment yield and disrupted sediment deliver. Understanding the sediment load regime is a prerequisite of sediment management and fluvial and deltaic ecosystem restoration. This work examines sediment load changes across the Changjiang River basin based on a long time series (1950–2017) of sediment load data stretching from the headwater to the delta. We find that the sediment loads have decreased progressively throughout the basin at multiple time scales. The sediment loads have decreased by ~96% and ~74% at the outlets of the upper basin and entire basin, respectively, in 2006–2017 compared to 1950–1985. The hydropower dams in the mainstem have become a dominant cause of the reduction, although downstream channel erosion causes moderate sediment load recovery. The basin-scale sediment connectivity has declined as the upper river is progressively dammed, the middle-lower river is leveed and river-lake interplay weakens. The middle-lower river has changed from a slight depositional to a severe erosional environment, from a sediment transport conduit to a new sediment source zone, and from a transport-limited to a supply-limited condition. These low-level sediment loads will likely persist in the future considering the cumulative dam trapping and depleted channel erosion. As a result, substantial hydro-morphological changes have occurred that affect the water supply, flood mitigation, and the aquatic ecosystem. The findings and lessons in this work can shed light on other large river systems subject to intensified human interference. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165821
Appears in Collections: 气候变化与战略
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作者单位: State Key Lab of Estuarine and Coastal Research, East China Normal University, Dongchuang Road 500, Shanghai, 200241, China; State Key Lab of Marine Geology, Tongji University, Siping Road 1239, Shanghai, 200090, China; School of Ocean and Earth Sciences, University of Southampton, Southampton, United Kingdom; Department of Hydraulic Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, 2600GA, Netherlands; Marine and Coastal Systems Department, Deltares, Delft, 2629HV, Netherlands
Recommended Citation:
Guo L.,Su N.,Townend I.,et al. From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River[J]. Earth Science Reviews,2019-01-01,197