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http://dx.doi.org/10.17663/JWR.2011.13.1.079

The Study on Stability Channel Technology by Using Groyne in Alluvial Stream - Riverside Protection Techniques by Using Groyne -  

Park, Hyo-Gil (동부엔지니어링 수자원부)
Jung, Sung-Soon (영남대학교 대학원)
Kim, Chul-Moon (국토해양부 4대강살리기추진본부.기술지원국)
Ahn, Won-Sik (수원대학교, 하천공학 연구소)
Jee, Hong-Kee (영남대학교 건설시스템공학과)
Publication Information
Journal of Wetlands Research / v.13, no.1, 2011 , pp. 79-94 More about this Journal
Abstract
As demonstrated in study for non-submerged groynes, the flow field is predominantly two-dimensional, with mainly horizontal eddies. The eddies shed form the tips of the groynes and migrate in the flow direction. These eddies have horizontal dimensions in the order of tens of meters and time-scales in the order of minutes. In the standard flow simulations, these motions are usually not resolved, due to a too coarse grid, too large time steps and, more importantly, the use of inadequate turbulence modelling. using for example a k-${\varepsilon}$ model, it is necessary to introduce substantial modifications. Therefore simulation resolved in this study, were carried out using the DELFT-3D-MOR programme, which is part of the DELFT3D software package of WL/Delft Hydraulics and In this study, apply a two-dimensional depth-averaged model, taking an horizontal large eddy simulation(HLES). The bed morphology computed when using HLES, as well as the associated time-scale, is similar to what has been obseved in a field case. When using a mean-flow model with-out HELS, the bed morphology is less realistic and the morphological time-scale is much larger. This slow development is the result of neglecting(or averaging). the strong velocity fluctuations associated with the time-varying eddy formation.
Keywords
Groyne; Alluvial Stream; DELRT3D;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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