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

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...

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Autores principales:	Seyedeh Fatemeh Nabaei, Hossein Afzalimehr, Jueyi Sui, Bimlesh Kumar, Seyed Hamidreza Nabaei
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	local scour semi-elliptical abutment vegetated bed Reynolds shear stress turbulence intensity Reynolds stress anisotropy Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/1decac3388ee41b4b30cc9d2e99ba95e
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spelling	oai:doaj.org-article:1decac3388ee41b4b30cc9d2e99ba95e2021-11-11T19:57:27ZInvestigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment10.3390/w132131082073-4441https://doaj.org/article/1decac3388ee41b4b30cc9d2e99ba95e2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3108https://doaj.org/toc/2073-4441In 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.Seyedeh Fatemeh NabaeiHossein AfzalimehrJueyi SuiBimlesh KumarSeyed Hamidreza NabaeiMDPI AGarticlelocal scoursemi-elliptical abutmentvegetated bedReynolds shear stressturbulence intensityReynolds stress anisotropyHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3108, p 3108 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	local scour semi-elliptical abutment vegetated bed Reynolds shear stress turbulence intensity Reynolds stress anisotropy Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	local scour semi-elliptical abutment vegetated bed Reynolds shear stress turbulence intensity Reynolds stress anisotropy Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Seyedeh Fatemeh Nabaei Hossein Afzalimehr Jueyi Sui Bimlesh Kumar Seyed Hamidreza Nabaei Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment
description	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.
format	article
author	Seyedeh Fatemeh Nabaei Hossein Afzalimehr Jueyi Sui Bimlesh Kumar Seyed Hamidreza Nabaei
author_facet	Seyedeh Fatemeh Nabaei Hossein Afzalimehr Jueyi Sui Bimlesh Kumar Seyed Hamidreza Nabaei
author_sort	Seyedeh Fatemeh Nabaei
title	Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment
title_short	Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment
title_full	Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment
title_fullStr	Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment
title_full_unstemmed	Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment
title_sort	investigation of the effect of vegetation on flow structures and turbulence anisotropy around semi-elliptical abutment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1decac3388ee41b4b30cc9d2e99ba95e
work_keys_str_mv	AT seyedehfatemehnabaei investigationoftheeffectofvegetationonflowstructuresandturbulenceanisotropyaroundsemiellipticalabutment AT hosseinafzalimehr investigationoftheeffectofvegetationonflowstructuresandturbulenceanisotropyaroundsemiellipticalabutment AT jueyisui investigationoftheeffectofvegetationonflowstructuresandturbulenceanisotropyaroundsemiellipticalabutment AT bimleshkumar investigationoftheeffectofvegetationonflowstructuresandturbulenceanisotropyaroundsemiellipticalabutment AT seyedhamidrezanabaei investigationoftheeffectofvegetationonflowstructuresandturbulenceanisotropyaroundsemiellipticalabutment
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Investigation of the Effect of Vegetation on Flow Structures and Turbulence Anisotropy around Semi-Elliptical Abutment

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