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http://dx.doi.org/10.5762/KAIS.2019.20.5.20

Numerical Analysis on the Turbulence Patterns in The Scour Hole at The Downstream of Bed Protection  

Lee, Jaelyong (Dept. of Civil and Environmental Engineering, Incheon National University)
Park, Sung Won (Dept. of Civil and Environmental Engineering, Incheon National University)
Yeom, Seongil (Dept. of Civil and Environmental Engineering, Incheon National University)
Ahn, Jungkyu (Dept. of Civil and Environmental Engineering, Incheon National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.5, 2019 , pp. 20-26 More about this Journal
Abstract
Where hydraulic structures are to be installed over the entire width of a river or stream, usually a bed protection structure is to be installed. However, a local scour occurs in which the river bed downstream of the river protection system is eroded due to the influence of the upstream flow characteristics. This local scour is dominant in the flow and turbulence characteristics at the boundary of the flow direction and in the material of the bed materials, and may gradually become dangerous over time. Therefore, in this study, we compared the turbulence patterns in the local scour hole at the downstream of the river bed protection with the results of the analysis of the mobile bed experiment, and compared with the application of OpenFoam, a three dimensional numerical analysis model. The distribution of depth-averaged relative turbulence intensities along the flow direction was analyzed. In addition to this result, the stabilization of scour hole was compared with the bed shear stress and Shields parameter, and the results were compared by changing the initial turbulent flow conditions. From the results, it was confirmed that the maximum depth of generation of the three-stage was dominantly developed by the magnitude of depth-averaged relative turbulence intensity rather than the mean flow velocity. This result also suggests that design, construction or gate control are needed to control the depth-averaged relative turbulence intensities in order to reduce or prevent the local scour faults that may occur in the downstream part of the bed protection.
Keywords
Bed Protection; Local Scour Hole; OpenFoam; Depth-averaged Relative Turbulence Intensity; Bed Shear Stress; Shields Parameter;
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