I.M.Gorban Numerical simulation of evolution of large-scale irregularities on a river bottom |
Applied hydromechanics, Vol. 17 (89) ¹ 1, (2015) |
| This paper deals with numerical simulation of bed-load sediment transport near large-scale irregularities placed on the bottom of open channels. It is founded on a shallow water system and a so called Exner equation that describes the evolution of topography. The numerical algorithm developed is coupled the Kurganov-Noelle-Petrova semidiscrete central-upwind scheme for integrating the hydrodynamic equations with a fifth order Euler-WENO scheme for sediment transport modeling. The splitting simulation of hydro- and morphodynamical processes as well as application of the high order schemes were shown to ensure stability of the results during a long-term modeling. The temporal and spatial characteristics of evolution of large-scale bottom irregularities such as sand humps and cavities were obtained. Those point out that sediment transport not only changes the cross profile of the irregularities but causes their moving on down the stream. |
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KEY WORDS: river bottom, erosion, sediment transport, hollow, sand dune |
| TEXT LANGUAGE: Ukrainian |