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Article

Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment

1
Department of Water Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran
2
Department of Civil Engineering, Iran University of Science and Technology, Tehran 1684613114, Iran
3
School of Engineering, University of Northern British Columbia, Prince George, BC V2N 4Z9, Canada
4
Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
5
Department of Mechanical Engineering, Tabriz University, Tabriz 5166616471, Iran
*
Authors to whom correspondence should be addressed.
Academic Editors: Francesco Gentile and C. Jason Williams
Water 2021, 13(21), 3108; https://doi.org/10.3390/w13213108
Received: 31 August 2021 / Revised: 28 October 2021 / Accepted: 31 October 2021 / Published: 4 November 2021
(This article belongs to the Special Issue Sediment Transport, Local Scour, and Fluvial Hydraulics)
In the present experimental study, the effect of vegetation on flow structure and scour profile around a bridge abutment has been investigated. The vegetation in the channel bed significantly impacted the turbulent statistics and turbulence anisotropy. Interestingly, compared to the channel without vegetation, the presence of vegetation in the channel bed dramatically reduced the primary vortex, but less impacts the wake vortex. Moreover, the tangential and radial velocities decreased with the vegetation in the channel bed, while the vertical velocity (azimuthal angle > 90°) had large positive values near the scour hole bed. Results showed that the presence of the vegetation in the channel bed caused a noticeable decrease in the Reynolds shear stress. Analysis of the Reynolds stress anisotropy indicated that the flow had more tendency to be isotropic for the vegetated bed. Results have shown that the anisotropy profile changes from pancake-shaped to cigar-shaped in the un-vegetated channel. In contrast, it had the opposite reaction for the vegetated bed. View Full-Text
Keywords: local scour; semi-elliptical abutment; vegetated bed; Reynolds shear stress; turbulence intensity; Reynolds stress anisotropy local scour; semi-elliptical abutment; vegetated bed; Reynolds shear stress; turbulence intensity; Reynolds stress anisotropy
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MDPI and ACS Style

Nabaei, S.F.; Afzalimehr, H.; Sui, J.; Kumar, B.; Nabaei, S.H. Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment. Water 2021, 13, 3108. https://doi.org/10.3390/w13213108

AMA Style

Nabaei SF, Afzalimehr H, Sui J, Kumar B, Nabaei SH. Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment. Water. 2021; 13(21):3108. https://doi.org/10.3390/w13213108

Chicago/Turabian Style

Nabaei, Seyedeh Fatemeh, Hossein Afzalimehr, Jueyi Sui, Bimlesh Kumar, and Seyed Hamidreza Nabaei. 2021. "Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment" Water 13, no. 21: 3108. https://doi.org/10.3390/w13213108

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