Turbulence modeling of compound open-channel flows with and without vegetation on the floodplain using the Reynolds stress model

Kang, Hyeongsik; Choi, Sung-Uk

doi:10.1016/j.advwatres.2005.12.004

Cited by 55 publications

(25 citation statements)

References 32 publications

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“…In the experiments performed in the research, the TKE values are found to be always higher near the end of the vegetation section. Also, and the maximum TKE values increases with the vegetation density, which is in agreement with some previous studies (Nepf, , Kang and Choi, ). However, the fashions of the TKE distribution for the three densities are similar.…”

Section: Resultsmentioning

confidence: 97%

Effects of Rigid Unsubmerged Vegetation on Flow Field Structure and Turbulent Kinetic Energy of Gradually Varied Flow

Zhang

Wang

et al. 2014

River Res. Applic.

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The influence of rigid unsubmerged vegetation on flow structure and turbulent kinetic energy of gradually varied flow are experimentally investigated in this research. Natural reed stems of different densities are employed to examine the effects of the rigid unsubmerged vegetation on the flow in rivers. The results reveal that the vegetation existence significantly changes the gradually varied flow state from type M1 to type M2 in the vegetation section. The traditional power law describing the vertical flow velocity profile is evidently invalid when the vegetation density becomes high. With the irregularity index proposed in the research, the irregularity of vertical flow velocity profile in vegetated reach can be exponentially described in relation to the vegetation density. Furthermore, the turbulent kinetic energy is found to increase and reach a maximum value near the end of the vegetation section that is a potential localized erosion area. The results of the research have significances in river ecological restoration applications utilizing aquatic vegetation. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 97%

Effects of Rigid Unsubmerged Vegetation on Flow Field Structure and Turbulent Kinetic Energy of Gradually Varied Flow

Zhang

Wang

et al. 2014

River Res. Applic.

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“…Physically-based parameterizations commonly consider the plants as uniformly-spaced rigid cylinders having a specified drag coefficient C D , frontal area per unit volume a, and stem diameter (e.g., DVWK 1991;Huai et al 2009;Kang and Choi 2006;Knight et al 2010). According to Luhar and Nepf (2013), little of the understanding on the flow-vegetation interaction at the patch scale has been applied to the reach scale, suggesting that approaches aimed at practical use need to be straightforward but still use measurable, physically-based vegetative properties.…”

Section: Introductionmentioning

confidence: 99%

Flow–Vegetation–Sediment Interaction in a Cohesive Compound Channel

2016

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“…In these areas, a shear layer does not form, and longitudinal advection contributes significantly to mass and momentum transport [10]. Kang and Choi (2006) [18] described a Reynolds stress model for the numerical simulation of compound open-channel flows with submerged vegetation on the floodplain. They considered various sub-models in the numerical model.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, they also investigated lateral momentum transfer in the compound-open channel and demonstrated that the rate of change of the apparent shear stress increased with vegetation density. Additionally, with the increasing vegetation density on the floodplain, the drag force term was pronounced when compared with the lateral gradient of the apparent shear stress and to reduce the bottom shear stress of its 2D value in the floodplain [18].…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics in the Wake Region of a Finite-Length Vegetation Patch in a Partly Vegetated Channel

Yilmazer

Ozan

Cihan

2018

Water

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Aquatic vegetation in rivers and coastal regions controls the flow structure in terms of mean velocity and turbulence. The vegetation in the flow affects the transportation of nutrients, microbes, dissolved oxygen, sediment, and contaminants; therefore, the flow characteristics of different types of vegetation layers should be examined in order to understand the effects of vegetation on the flow structure. In this paper, the effect of the submergence ratio and SVF (Solid Volume of Fraction) of a vegetation patch, which was present across half of the channel in a spanwise direction, on the flow structure at the wake region was examined. For this purpose, different submergence ratios with different SVFs were considered in the experiments, and velocity measurements were performed in the wake region of the vegetation layer with an Acoustic Doppler Velocimeter (ADV). According to the results, the effect of different vegetation heights and SVFs on the velocity distribution was obtained. Moreover, inflectional velocity distribution over the cross-section in the wake region of the vegetation layer was obtained, and it was concluded that jet flow occurred in the non-vegetated half of the channel due to the vegetation layer.

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Turbulence modeling of compound open-channel flows with and without vegetation on the floodplain using the Reynolds stress model

Cited by 55 publications

References 32 publications

Effects of Rigid Unsubmerged Vegetation on Flow Field Structure and Turbulent Kinetic Energy of Gradually Varied Flow

Effects of Rigid Unsubmerged Vegetation on Flow Field Structure and Turbulent Kinetic Energy of Gradually Varied Flow

Flow–Vegetation–Sediment Interaction in a Cohesive Compound Channel

Flow Characteristics in the Wake Region of a Finite-Length Vegetation Patch in a Partly Vegetated Channel

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