Three-dimensional numerical modeling of reservoir sediment release

For the computation of flow field and bed evolution in a water reservoir during the flushing process a fully three-dimensional hydrodynamic model, using a finite volume method to solve the Reynolds averaged Navier-Stokes equations, has been developed and combined with a three-dimensional sediment tr...

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Bibliographic Details
Published in:Journal of hydraulic research 2008-01, Vol.46 (2), p.209-223
Main Authors: Khosronejad, A., Rennie, C.D., Neyshabouri, A.A. Salehi, Gholami, I.
Format: Article
Language:English
Subjects:
Bed evolution
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
Hydrology
Hydrology. Hydrogeology
Marine and continental quaternary
numerical modeling
reservoir
sediment transport
Surficial geology
three dimensional
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Summary:For the computation of flow field and bed evolution in a water reservoir during the flushing process a fully three-dimensional hydrodynamic model, using a finite volume method to solve the Reynolds averaged Navier-Stokes equations, has been developed and combined with a three-dimensional sediment transport model. The hydrodynamic model is based the equations of mass and momentum conservation along with a standard k-e turbulence closure model. The sediment transport model is based on the equation of convection/diffusion of sediment concentration and sediment continuity equation for calculating the sediment concentration and bed level change in the reservoir flushing process, respectively. Both the hydrodynamic and sediment transport models are developed in a boundary-fitted curvilinear coordinate system. The grid is adaptive in the vertical direction, and changes according to the calculated bed level. The hydrodynamic section of the model was verified using experimental and direct numerical simulations data, and the sediment concentration calculations compare well with the experimental results. Also a physical model study was carried out to verify the results of bed evolution at the upstream of a sluice gate. Good agreement is found between bed evolution in the numerical and physical models.
ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2008.9521856