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

文献类型：期刊论文

作者Gu, Leilei1,2; Zhang, Shiyan1; He, Li1; Chen, Dong1,2; Blanckaert, Koen3; Ottevanger, Willem4; Zhang, Yun5
刊名WATER
出版日期2016-10-01
卷号8期号:10页码:21
关键词numerical simulation nonlinear model meander evolution bank erosion
ISSN号2073-4441
DOI10.3390/w8100418
通讯作者Zhang, Shiyan(zhangshy@igsnrr.ac.cn)
英文摘要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.
WOS关键词SAND-BED RIVERS ; NUMERICAL-SIMULATION ; BEND THEORY ; WIDTH ; DYNAMICS ; REDISTRIBUTION ; DEFORMATION ; MORPHOLOGY ; TRANSPORT
资助项目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
WOS研究方向Water Resources
语种英语
WOS记录号WOS:000389659200003
出版者MDPI AG
资助机构National Natural Science Foundation of China ; Hundred Talents Program of the Chinese Academy of Science
源URL[http://ir.igsnrr.ac.cn/handle/311030/65500]  
专题中国科学院地理科学与资源研究所
通讯作者Zhang, Shiyan
作者单位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
推荐引用方式
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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来源：地理科学与资源研究所

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