Interacting effects of multiple factors on the morphological evolution of the meandering reaches downstream the Three Gorges Dam

doi:10.1007/s11442-017-1434-0

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	Interacting effects of multiple factors on the morphological evolution of the meandering reaches downstream the Three Gorges Dam
	Zhang, Wei 3; Zhang, W (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.; Yu, Mengqing 3; Fan, Yongyang 2; Han, Jianqiao 1,3
刊名	JOURNAL OF GEOGRAPHICAL SCIENCES
	2017
卷号	27 期号:10 页码:1268-1278
关键词	Reaches Downstream Dams Meandering River Morphological Evolution Three Gorges Dam
ISSN号	1009-637X
DOI	10.1007/s11442-017-1434-0
文献子类	Article
英文摘要	Elucidating the influence of dams on fluvial processes can inform river protection and basin management. However, relatively few studies have focused on how multiple factors interact to affect the morphological evolution of meandering reaches. Using hydrological and topographical data, we analyzed the factors that influence and regulate the meandering reaches downstream the Three Gorges Dam (TGD). Our conclusions are as follows. (1) The meandering reaches can be classified into two types based on their evolution during the pre-dam period: G1 reaches, characterized by convex point bar erosion and concave channel deposition (CECD), and G2 reaches, characterized by convex point bar deposition and concave channel erosion (CDCE). Both reach types exhibited CECD features during the post-dam period. (2) Flow processes and sediment transport are the factors that caused serious erosion of the low beaches located in the convex point bars. However, changes in the river regime, river boundaries and jacking of Dongting Lake do not act as primary controls on the morphological evolution of the meandering reaches. (3) Flood discharges ranging from 20,000 to 25,000 m(3)/s result in greater erosion of convex point bars. The point bars become scoured if the durations of these flows, which are close to bankfull discharge, exceed 20 days. In addition, the reduction in bedload causes the decreasing of point bar siltation in the water-falling period. (4) During the post-dam period, flood abatement, the increased duration of discharges ranging from 20,000 to 25,000 m(3)/s, and a significant reduction in sediment transport are the main factors that caused meandering reaches to show CECD features. Our results are relevant to other meandering reaches, where they can inform estimates of riverbed change, river management strategies and river protection.
学科主题	Physical Geography
URL标识	查看原文
出版地	BEIJING
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000404923500007
资助机构	National Natural Science Foundation of China [51479146]; Doctoral Foundation of Northwest AF University [2452015337]; National Key Research and Development Plan [2016YFC0402303, 2016YFC0402101] ; National Natural Science Foundation of China [51479146]; Doctoral Foundation of Northwest AF University [2452015337]; National Key Research and Development Plan [2016YFC0402303, 2016YFC0402101] ; National Natural Science Foundation of China [51479146]; Doctoral Foundation of Northwest AF University [2452015337]; National Key Research and Development Plan [2016YFC0402303, 2016YFC0402101] ; National Natural Science Foundation of China [51479146]; Doctoral Foundation of Northwest AF University [2452015337]; National Key Research and Development Plan [2016YFC0402303, 2016YFC0402101]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7919]
专题	水保所科研产出--SCI_2017--SCI
通讯作者	Zhang, W (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.Changjiang Inst Survey Planning Design & Res, Wuhan 430010, Peoples R China 3.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wei,Zhang, W ,Yu, Mengqing,et al. Interacting effects of multiple factors on the morphological evolution of the meandering reaches downstream the Three Gorges Dam[J]. JOURNAL OF GEOGRAPHICAL SCIENCES,2017,27(10):1268-1278.
APA	Zhang, Wei,Zhang, W ,Yu, Mengqing,Fan, Yongyang,&Han, Jianqiao.(2017).Interacting effects of multiple factors on the morphological evolution of the meandering reaches downstream the Three Gorges Dam.JOURNAL OF GEOGRAPHICAL SCIENCES,27(10),1268-1278.
MLA	Zhang, Wei,et al."Interacting effects of multiple factors on the morphological evolution of the meandering reaches downstream the Three Gorges Dam".JOURNAL OF GEOGRAPHICAL SCIENCES 27.10(2017):1268-1278.