Numerical modelling of channel migration with application to laboratory rivers

查看全文 作　　者：Jian [1]SUN;Bin-liang [2,3]LIN;Hong-wei [4]KUANG

机构地区：[1]State key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University;[2]State Key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University;[3]Cardiff School of Engineering,Cardiff,Wales CF243AA,UK;[4]Changjiang Waterway Planning Design and Research Institute

出　　处：《International Journal of Sediment Research》索引2015年第30卷第1期,共15页

基　　金：supported by the National Natural Science Foundation of China(11002099);the National Hi-Tech Research and Development Program of China(863 Program,2012AA052602);the State Key Laboratory of Hydroscience and Engineering,Tsinghua University(grants 2013-ky-1);The authors are grateful to the funders for the support 摘　　要：The paper presents the development of a morphological model and its application to experimental model rivers.The model takes into account the key processes of channel migration,including bed deformation,bank failure and wetting and drying.Secondary flows in bends play an important role in lateral sediment transport,which further affects channel migration.A new formula has been derived to predict the near-bed secondary flow speed,in which the magnitude of the speed is linked to the lateral water level gradient.Since only non-cohesive sediment is considered in the current study,the bank failure is modelled based on the concept of submerged angle of repose.The wetting and drying process is modelled using an existing method.Comparisons between the numerical model predictions and experimental observations for various discharges have been made.It is found that the model predicted channel planform and cross-sectional shapes agree generally well with the laboratory observations.A scenario analysis is also carried out to investigate the impact of secondary flow on the channel migration process.It shows that if the effect of secondary flow is ignored,the channel size in the lateral direction will be seriously underestimated. 关键词：迁徙通道迁移过程数值模拟实验室河流应用二次流动实验模型

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Numerical modelling of channel migration with application to laboratory rivers

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耦合文献(9)

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