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Sediment Transport in Rivers with overbank flow

四川大学学报（工程科学版） 2005年第S1期37卷 16-29页

作者： Donald W KNIGHT Water Eng. The Univ.of BirminghamUK

Some concepts related to sediment transport in rivers with overbank flow are *** a description of the physical processes that are involved when a river inundates its floodplains,some simple com- putational methods are presented which permit the depth-averaged velocity and boundary shear stress to be pre- dicted within a cross section of variable,but prismatic *** methoda account for the strong transverse shear in velocity that occurs when the stage is just above bankfull,as well as ...

关键词： sediment transport overbank flow

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3D Numerical Simulation of overbank flow in Non-Orthogonal Curvilinear Coordinates

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China Ocean Engineering 2005年第3期19卷 395-407页

作者：张明亮沈永明吴修广 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China Zhejiang Institute of Hydraulics and Estuary Hangzhou 310020 China

The velocity field in meandering compound channels with overhank flow is highly three dimensional. To date, its features have been investigated experimentally and little research has been undertaken to investigate the feasibility of reproducing these velocity fields with computer models. If computer modeling were to prove successful in this context, it could become a useful prediction technique and research tool to enhance our understanding of natural river dynamics. A 3-D k-E turbulence hydrodynamic model in curvilinear coordinates is established to simulate the overhank flow. The bodyfitted coordinate is adopted in the horizontal plane, the part grid is adopted in the vertical direction, and the wall-function method is employed to simulate the bed resistance. The model is applied to the simulation of the meandering channel with straight flood plain banks, and the main velocities and secondary velocities for both the longitudinal and cross sections are presented. Comparison and analysis show that the results of simulation are fit to reflect the results of experiment. These results show the application value of the model to 3D overhank flow.

关键词： non-orthogonal curvilinear coordinates overbank flow wall-function method k-ε turbulence model

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Secondary flow coefficient of overbank flow

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Applied Mathematics and Mechanics(English Edition) 2010年第6期31卷 709-718页

作者：杨中华高伟槐文信 State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

This paper presents a 2D analytical solution for the transverse velocity distribution in compound open channels based on the Shiono and Knight method （SKM）, in which the secondary flow coefficient （K-value） is introduced to take into account the effect of the secondary flow. The modeling results agree well with the experimental results from the Science and Engineering Research Council-Flood Channel Facility （SERC-FCF）. Based on the SERC-FCF, the effects of geography on the secondary flow coefficient and the reason for such effects are analyzed. The modeling results show that the intensity of the secondary flow is related to the geometry of the section of the compound channel, and the sign of the K-value is related to the rotating direction of the secondary flow cell. This study provides a scientific reference to the selection of theK-value.

关键词： compound channels overbank flow velocity distribution secondary flow

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flow MECHANISMS ANDSEDIMENT TRANSPORT IN COMPOUND CHANNELS

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International Journal of Sediment Research 1999年第2期14卷 217-236页

作者： Donald W. KNIGHT (1 School of Civil Engineering. The University of Birmingham, Edgbaston, Birmingham, B 15 2TT. UK)

Recent work on the UK Flood Channel Facility (FCF) is described. An overview of tile various experimental programmes. involving overbank flow studies in straight. skewed and meandering channels. is given. Some key results concerning flow mechanisms. resistance. dispcrsion and sediment transport are reviewed. A summary of different methods for estimating the stage-discharge relationship for overbank flows is included. An extensive bibliography is given for those seeking more detailed information.

关键词： Floods overbank flow Sediment transport Stage-discharge curves

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