Modeling Flow Pattern and Evolution of Meandering Channels with a Nonlinear Model

doi:10.3390/w8100418

IGSNRR OpenIR

	Modeling Flow Pattern and Evolution of Meandering Channels with a Nonlinear Model
	Gu, Leilei 1,2; Zhang, Shiyan 1; He, Li1 ; Chen, Dong1,2 ; Blanckaert, Koen 3; Ottevanger, Willem 4; Zhang, Yun 5
	2016-10-01
Source Publication	WATER
ISSN	2073-4441
Volume	8 Issue:10 Pages:21
Corresponding Author	Zhang, Shiyan(zhangshy@igsnrr.ac.cn)
Abstract	Meander dynamics has been the focus of river engineering for decades; however, it remains a challenge for researchers to precisely replicate natural evolution processes of meandering channels with numerical models due to the high nonlinearity of the governing equations. The present study puts forward a nonlinear model to simulate the flow pattern and evolution of meandering channels. The proposed meander model adopts the nonlinear hydrodynamic submodel developed by Blanckaert and de Vriend, which accounts for the nonlinear interactions between secondary flow and main flow and therefore has no curvature restriction. With the computational flow field, the evolution process of the channel centerline is simulated using the Bank Erosion and Retreat Model (BERM) developed by Chen and Duan. Verification against two laboratory flume experiments indicates the proposed meander model yields satisfactory agreement with the measured data. For comparison, the same experimental cases are also simulated with the linear version of the hydrodynamic submodel. Calculated results show that the flow pattern and meander evolution process predicted by the nonlinear and the linear models are similar for mildly curved channels, whereas they exhibit different characteristics when channel sinuosity becomes relatively high. It is indicated that the nonlinear interactions between main flow and secondary flow prevent the growth of the secondary flow and induce a more uniform transverse velocity profile in high-sinuosity channels, which slows down the evolution process of meandering channels.
Keyword	numerical simulation nonlinear model meander evolution bank erosion
DOI	10.3390/w8100418
WOS Keyword	SAND-BED RIVERS ; NUMERICAL-SIMULATION ; BEND THEORY ; WIDTH ; DYNAMICS ; REDISTRIBUTION ; DEFORMATION ; MORPHOLOGY ; TRANSPORT
Indexed By	SCI
Language	英语
Funding Project	National Natural Science Foundation of China[51509234] ; National Natural Science Foundation of China[51279192] ; National Natural Science Foundation of China[51579230] ; National Natural Science Foundation of China[41330751] ; Hundred Talents Program of the Chinese Academy of Science
Funding Organization	National Natural Science Foundation of China ; Hundred Talents Program of the Chinese Academy of Science
WOS Research Area	Water Resources
WOS Subject	Water Resources
WOS ID	WOS:000389659200003
Publisher	MDPI AG
Citation statistics	Cited Times:6[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.igsnrr.ac.cn/handle/311030/65501
Collection	中国科学院地理科学与资源研究所
Corresponding Author	Zhang, Shiyan
Affiliation	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Ecole Polytech Fed Lausanne, Ecol Engn Lab ECOL, CH-1015 Lausanne, Switzerland 4.Deltares, River Engn & Inland Shipping, NL-2600 MH Delft, Netherlands 5.Stanford Univ, Dept Civil & Environm Engn, Environm Fluid Mech Lab, Stanford, CA 94305 USA
Recommended Citation GB/T 7714	Gu, Leilei,Zhang, Shiyan,He, Li,et al. Modeling Flow Pattern and Evolution of Meandering Channels with a Nonlinear Model[J]. WATER,2016,8(10):21.
APA	Gu, Leilei.,Zhang, Shiyan.,He, Li.,Chen, Dong.,Blanckaert, Koen.,...&Zhang, Yun.(2016).Modeling Flow Pattern and Evolution of Meandering Channels with a Nonlinear Model.WATER,8(10),21.
MLA	Gu, Leilei,et al."Modeling Flow Pattern and Evolution of Meandering Channels with a Nonlinear Model".WATER 8.10(2016):21.

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