ISWC OpenIR  > 水保所科研产出--SCI  > 2017--SCI
Interacting effects of multiple factors on the morphological evolution of the meandering reaches downstream the Three Gorges Dam
Han, Jianqiao1,2; Zhang, Wei2; Fan, Yongyang3; Yu, Mengqing2; Zhang, W (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
SubtypeArticle
2017
Source PublicationJOURNAL OF GEOGRAPHICAL SCIENCES
ISSN1009-637X
description.correspondentemailhjq13@163.com ; wzhang97082@whu.edu.cn
Volume27Issue:10Pages:1268-1278
AbstractElucidating 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.
KeywordReaches Downstream Dams Meandering River Morphological Evolution Three Gorges Dam
Subject AreaPhysical Geography
DOI10.1007/s11442-017-1434-0
URL查看原文
Indexed BySCI
Publication PlaceBEIJING
Language英语
WOS IDWOS:000404923500007
PublisherSCIENCE PRESS
Funding OrganizationNational 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]
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Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/7919
Collection水保所科研产出--SCI_2017--SCI
Corresponding AuthorZhang, W (reprint author), Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
Affiliation1.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
2.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
3.Changjiang Inst Survey Planning Design & Res, Wuhan 430010, Peoples R China
Recommended Citation
GB/T 7714
Han, Jianqiao,Zhang, Wei,Fan, Yongyang,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 Han, Jianqiao,Zhang, Wei,Fan, Yongyang,Yu, Mengqing,&Zhang, W .(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 Han, Jianqiao,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.
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