Quasi-3D and Fully 3-D Modelling of Suspended Sediment Transport

by Francisco M. Toro, Univ Nacional Colombia, Colombia,
Karel Meijer, Univ Nacional Colombia, Colombia,
Leo van Rijn, Univ Nacional Colombia, Colombia,

Abstract: The influence of different velocity and eddy viscosity fields on the computation of suspended sediment concentration and sediment transport rates, is presented here. Two different mathematical models which generate the velocity field were used: the WAQUA model which generates a steady 2-D horizontal velocity field based on the depth-integrated Reynolds equations, and the PHOENICS model that generates a steady fully 3-D velocity and eddy viscosity fields by solving the 3-D Reynolds equations simultaneously with the energy transport and energy dissipation rate equations (K-Epsilon approach). The velocity and eddy viscosity fields generated by these two models were used by the SUSTRA-3D model to obtain the suspended sediment concentration by solving the 3-D convection-diffusion equation. A straight channel with a spur dike at mid-length was chosen as the test case.

Subject Headings: Three-dimensional models | Mathematical models | Suspended sediment | Viscosity | Sediment transport | Two-dimensional models | Eddy (fluid dynamics) | Three-dimensional flow

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