Numerical Modeling of Sediment Transport and Bed Evolution in Nonuniform Open-Channel Flows

• Autorzy: Zerihun Yebegaeshet T.

Identyfikatory

DOI

10.2478/heem-2024-0001

• Języki publikacji: EN

Abstrakty

EN

The shallow-water and multilayer hydrostatic models have been commonly used to analyze the problems of a sediment-laden, plane open-channel flow. The models are adequate to solve a quasi-hydrostatic flow problem, but their accuracy deteriorates as the effects of the vertical acceleration gain in significance. Herein, a higher-order numerical model for treating the problems of unsteady, plane open-channel flow over a movable bed is proposed. In this model, the flow hydrodynamics is governed by the depth-averaged Boussinesq-type equations, and the bed morphodynamics is determined by an Exner-type equation and additional equations describing the non-equilibrium transports of suspended load and bed load. A hybrid finite-volume and finite-difference scheme was used to discretize and solve the governing equations, yielding solutions that are in satisfactory agreement with the experimental data. Overall, the results of the proposed model for the temporal free-surface profile and bed evolution were fairly adequate. For the two particular cases considered, however, the quality of its results was moderately affected by the effects of the three-dimensional characteristics of the dam-break flow and the sliding of the dike body due to sub-surface flow. The results of this investigation highlight the importance of including a higher-order Boussinesq-type correction for refining sediment transport computations.

Słowa kluczowe

EN

turbulent flow; sediment transport; dike breach; finite-volume method; non-equilibrium; transport; morphodynamics

• Wydawca: Institute of Hydro-Engineering of Polish Academy of Sciences
• Czasopismo: Archives of Hydro-Engineering and Environmental Mechanics
• Rocznik: 2024
• Tom: Vol. 71, nr 1
• Strony: 1--26
• Opis fizyczny: Bibliogr. 74 poz., rys.,

Twórcy

autor

Zerihun Yebegaeshet T.

• David & James – Engineering and Environmental Consultancy, 204 Albion Road, Vic 3350, Australia

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