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Article

Flow Characteristics in Open Channels with Non-Submerged Rigid Vegetation Landscape

1
College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832003, China
2
College of Management and Economics, Tianjin University, Tianjin 300072, China
3
School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan 056038, China
4
Nomal College, Shihezi University, Shihezi 832003, China
*
Author to whom correspondence should be addressed.
Water 2024, 16(19), 2759; https://doi.org/10.3390/w16192759
Submission received: 16 August 2024 / Revised: 21 September 2024 / Accepted: 26 September 2024 / Published: 27 September 2024
(This article belongs to the Section Hydraulics and Hydrodynamics)

Abstract

The commercial CFD package Fluent and the Reynolds stress model were used to simulate the hydraulic characteristics with three types of vegetation distribution: longitudinal, interlaced and patch. Each type was aggregated to the middle line l of the water flow in an equal proportion of 0.5, resulting in a total of nine landscape vegetation arrangements. The numerical model was verified and showed a high level of consistency with the experimental comparison; the results indicate the following: (1) As the distribution of landscape vegetation on both sides becomes increasingly concentrated from a loose state to the middle line l of the flow, the flow velocity declines and the maximum Reynolds stress rises, and the greater the Reynolds stress, the more powerful the shear layer, contributing to turbulence, generating mass and momentum exchange and enhancing the vertical transport of momentum. (2) Compared with the gap area, the flow velocity in the vegetation area is smaller, the turbulent kinetic energy is larger and the maximum Reynolds stress of the bottom flow is larger; the larger sediment particles tend to deposit in the gap area, while smaller sediments tend to deposit in the vegetation area. At the same time, the vegetation area is more prone to deposits than the gap area. (3) Under the same vegetation density, whether in the test area or the wake area, the water blocking capacity and the deposition capacity are in the following order: patch distribution pattern > interlaced distribution pattern > longitudinal distribution pattern.
Keywords: non-submerged rigid vegetation; landscape vegetation arrangement; open-channel flow; numerical simulations; hydraulic characteristics non-submerged rigid vegetation; landscape vegetation arrangement; open-channel flow; numerical simulations; hydraulic characteristics

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MDPI and ACS Style

Wang, W.; Long, A.; Lai, X.; Zhang, J.; Xu, T. Flow Characteristics in Open Channels with Non-Submerged Rigid Vegetation Landscape. Water 2024, 16, 2759. https://doi.org/10.3390/w16192759

AMA Style

Wang W, Long A, Lai X, Zhang J, Xu T. Flow Characteristics in Open Channels with Non-Submerged Rigid Vegetation Landscape. Water. 2024; 16(19):2759. https://doi.org/10.3390/w16192759

Chicago/Turabian Style

Wang, Wenjun, Aihua Long, Xiaoying Lai, Jingzhou Zhang, and Tongxuan Xu. 2024. "Flow Characteristics in Open Channels with Non-Submerged Rigid Vegetation Landscape" Water 16, no. 19: 2759. https://doi.org/10.3390/w16192759

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