气候变化领域集成服务门户(CCPortal): From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River

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DOI	10.1016/j.earscirev.2019.102900
	From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River
	Guo L.; Su N.; Townend I.; Wang Z.B.; Zhu C.; Wang X.; Zhang Y.; He Q.
发表日期	2019
ISSN	00128252
卷号	197
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.
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
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203444
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
推荐引用方式 GB/T 7714	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],2019,197.
APA	Guo L..,Su N..,Townend I..,Wang Z.B..,Zhu C..,...&He Q..(2019).From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River.Earth Science Reviews,197.
MLA	Guo L.,et al."From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River".Earth Science Reviews 197(2019).