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2-D NUMERICAL SIMULATION OF CRUSH bedROCK RIVER

Journal of Hydrodynamics 2004年第4期16卷 449-454页

作者： YINZe-gao ZHANGTu-qiao SUNDong-po LIGuo-qing DepartmentofCivilEngineering ZhejiangUniversityHangzhou310027China DepartmentofWaterConservancyEngineering NorthChinaInstituteofWaterConservancyandHydroelectricPowerZhengzhou450008China

In this paper, the erosion-resisting coefficient was introduced to computebed deformation in a crush bedrock river. In the case of crush bedrock, there has been no propercontrol equation to describe bed stability, which leads to difficulty in calculation of the beddeformation with conventional methods. The data from field survey were used to give thee-rosion-resisting capability with an appropriate coefficient. After the determination oflongitudinal distribution expressed by polynomial regression and transversal distribution expressedby normal distribution function, the plane distribution of erosion-resisting coefficient in a crushbedrock river was obtained. With the computational results from a 2-D horizontal flow mathematicalmodel, the erosion-resisting coefficient and controlling condition of local stability were employedto compute the values of bed deformation when riverbed is stable. The above method was applied in acase study, and the computational results of flow and bed deformations are in good a-greement withphysical model test data.

关键词： numerical simulation 2-D horizontal flow mathematical model (HFMM) erosion-resisting coefficient (ERC) bed deformation crush bedrock river

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A three dimensional k-ε-Ap model for water-sediment movement

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International Journal of Sediment Research 2010年第1期25卷 17-27页

作者： LIU Cheng1 and SHEN Yong-Ming2 1Ph.D.,Pearl River Hydraulic Research Institute,Guangzhou,510611,China 2Prof.,State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China Ph.D. Pearl River Hydraulic Research Institute Guangzhou 510611 China Prof. State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

A three-dimensional k-ε-Ap two-fluid turbulence model is proposed to study liquid-particle two-phase flow and bed deformation. By solving coupled liquid-phase and solid-phase governing equations in a finite-volume method, the model can calculate the movement of both water and sediment. The model was validated by water-sediment transport in a 180° channel bend with a movable bed. The validation concerns two-phase time-averaged velocities, bed deformation, water depth, depth-averaged streamwise velocity, cross-stream bed profiles, and two-phase secondary flow velocity vectors. The agreement between numerical results and experimental results was generally good. The comparisons of the numerical results of different models show that the three-dimensional k-ε-Ap two-fluid turbulence model has a relatively higher accuracy than one-fluid model.

关键词： Three dimensional k-ε-Ap model Liquid-particle flow Two-fluid model Channel bend bed deformation Curvilinear coordinates

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2-D FLOW AND SEDIMENT SIMULATION FOR THE FLOOD REGULATION OF A RESERVOIR WITH WATER INTAKE

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Journal of Hydrodynamics 1998年第2期10卷 1-7页

作者： Zhou Fa-yiUniversity of Alberta, CanadaChen Bi-hongDalian University of Technology, Dalian 116023, P. R. China

In this paper, the flood regulation by operating the downstream sluice gates for a reservoir with a water intake is studied. The two-dimensional depth-averaged flow equations are solved by the boundary fitted finite volume method (FVM) based on MacCormack prediction-correction scheme. The bed deformation caused by both the bed load and incoming suspended sediment is determined in a coupled way. The model is used to simulate the practical flood regulation operation of a reservoir. The results have been compared with the physical experiment.

关键词： finite volume method (FVM) MacCormack prediction-correction scheme bed deformation water intake

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Two-Dimensional Mathematical Model of Tidal Current and Sediment for Oujiang Estuary and Wenzhou Bay

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China Ocean Engineering 2002年第1期17卷 107-122页

作者：陆永军李浩麟董壮陆建宇郝嘉凌 River and Harbor Department Nanjing Hydraulic Research Institute

A 2-D mathematical model of tidal current and sediment has been developed for the Oujiang Estuary and the Wenzhou Bay. This model accomodates complicated features including multiple islands, existence of turbidity, and significant differ-ence in size distribution of bed material. The governing equations for non-uniform suspended load and bed load transport are presented in a boundary-fitted orthogonal curvilinear coordinate system. The numerical solution procedures along with their initial conditions, boundary conditions, and movable boundary technique are presented. Strategies for computation of the critical condition of deposition or erosion, sediment transport capacity, non-uniform bed load discharge, etc. are suggested. The model verification computation shows that, the tidal levels computed from the model are in good agreement with the field data at the 18 tidal gauge stations. The computed velocities and flow directions also agree well with the values measured along the totally 52 synchronously observed verticals distributed over 8 cross sections. The coraputed tidal water throughputs through the Huangda'ao cross section are close to the measured data. And the computed values of bed deformation from Yangfushan to the estuary outfall and in the outer-sea area are in good agreement with the data observed from 1986 to 1992. The changes of tidal volumes through the estuary, velocities in different channels and the bed form due to the influence of the reclamation project on the Wenzhou shoal are predicted by means of this model.

关键词： mathematical model tidal current non-uniform suspended load non-uniform bed load non-equilibrium transport bed deformation

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