Scalar flux modeling of solute transport in open channel flows: Numerical tests and effects of secondary currents

Numerical experiments involving various algebraic scalar flux models for solute transport in open channel flows are presented. Five algebraic scalar flux models including these of Daly and Harlow, Abe and Suga, Suga and Abe, Sommer and So, and Wikstrom et al. are tested. For the flow computation, a...

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Bibliographic Details
Published in:Journal of hydraulic research 2009-01, Vol.47 (5), p.643-655
Main Authors: Hyeongsik, Kang, Sung-Uk, Choi
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Hydrology. Hydrogeology
Open channel flow
Reynolds flux
Scalar flux model
Secondary currents
Solute transport
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Summary:Numerical experiments involving various algebraic scalar flux models for solute transport in open channel flows are presented. Five algebraic scalar flux models including these of Daly and Harlow, Abe and Suga, Suga and Abe, Sommer and So, and Wikstrom et al. are tested. For the flow computation, a Reynolds stress model is used. The models are applied to laboratory experiments of solute transport in rectangular and compound open channel flows. The performance of each model is evaluated both qualitatively and quantitatively. It is found that Daly and Harlow's model, although simple, predicts the solute transport most accurately. Further, with reference to the simulation results, the roles of the Reynolds fluxes and secondary currents in the solute transport equation are investigated. It is found that the Reynolds fluxes and secondary currents reduce and move the peak concentration, respectively.
ISSN:0022-1686
1814-2079
DOI:10.3826/jhr.2009.3562