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From the headwater to the delta : A synthesis of the basin-scale sediment load regime in the Changjiang River. / Guo, Leicheng; Su, Ni; Townend, Ian; Wang, Zhengbing ; Zhu, Chunyan; Wang, Xianye; Zhang, Yuning; He, Qing.

In: Earth - Science Reviews, Vol. 197, 102900, 2019.

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Guo, Leicheng ; Su, Ni ; Townend, Ian ; Wang, Zhengbing ; Zhu, Chunyan ; Wang, Xianye ; Zhang, Yuning ; He, Qing. / From the headwater to the delta : A synthesis of the basin-scale sediment load regime in the Changjiang River. In: Earth - Science Reviews. 2019 ; Vol. 197.

BibTeX

@article{6c006057759e47e0b3924546713cce20,
title = "From the headwater to the delta: A synthesis of the basin-scale sediment load regime in the Changjiang River",
abstract = "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.",
keywords = "Changjiang, Sediment load, Sediment starvation, Source-to-sink",
author = "Leicheng Guo and Ni Su and Ian Townend and Zhengbing Wang and Chunyan Zhu and Xianye Wang and Yuning Zhang and Qing He",
note = "Accepted Author Manuscript",
year = "2019",
doi = "10.1016/j.earscirev.2019.102900",
language = "English",
volume = "197",
journal = "Earth - Science Reviews",
issn = "0012-8252",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - From the headwater to the delta

T2 - A synthesis of the basin-scale sediment load regime in the Changjiang River

AU - Guo, Leicheng

AU - Su, Ni

AU - Townend, Ian

AU - Wang, Zhengbing

AU - Zhu, Chunyan

AU - Wang, Xianye

AU - Zhang, Yuning

AU - He, Qing

N1 - Accepted Author Manuscript

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Changjiang

KW - Sediment load

KW - Sediment starvation

KW - Source-to-sink

UR - http://www.scopus.com/inward/record.url?scp=85069525590&partnerID=8YFLogxK

U2 - 10.1016/j.earscirev.2019.102900

DO - 10.1016/j.earscirev.2019.102900

M3 - Review article

VL - 197

JO - Earth - Science Reviews

JF - Earth - Science Reviews

SN - 0012-8252

M1 - 102900

ER -

ID: 55252099