Hydraulic characteristics of open-channel flow with partially-placed double layer rigid vegetation

Tang, Xiaonan; Rahimi, Hamidreza; Guan, Yutong; Wang, Yuxuan

doi:10.1007/s10652-020-09775-1

Cited by 27 publications

(23 citation statements)

References 34 publications

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“…center) is faster than that in the vegetation region where the slow-moving flow is due to the additional resistance of vegetation. These findings are similar to those observed by Tang et al (2019Tang et al ( , 2021.…”

Section: Lateral Distribution Of Depth-averaged Velocitysupporting

confidence: 92%

“…Besides, as the water depth increases, when the short vegetation is fully submerged but the tall vegetation is emergent (case H = 14 cm), the vegetation will reduce the relative velocity of the free region more than in the vegetation region, resulting in a smaller gradient of lateral velocity in the transition layer between the vegetation and non-vegetation regions. This result indicates that the influence of depth on the resistance in the vegetated region is relatively smaller compared with that in the free region (Tang et al, 2019(Tang et al, , 2021.…”

Section: Lateral Distribution Of Depth-averaged Velocitymentioning

confidence: 88%

“…At the locations of BSS and BSTS (i.e. short vegetation in submerged conditions), their velocities start to increase from certain distances (z/h at about 0.6) below the top of short vegetation, indicating a penetration depth due to the strong shear between the upper free flow and lower vegetated flow (Nepf & Vivoni, 2000;Tang et al, 2021).…”

Section: Lateral Change Of Velocity Profilesmentioning

confidence: 99%

“…, 2020. Most recently, Tang et al (2018Tang et al ( , 2019Tang et al ( , 2021 have conducted experiments on the flow with double-layer vegetation that covered one side of a channel bed. However, there is little study about the impact of non-evenly distributed multi-layered vegetation along two sides of a channel, which commonly exists in rivers.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Partially Covered Vegetation on the Lateral Velocity Distribution of Open Channel Flow

Tang¹,

Hu²

2021

GEP

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The vegetation affects the flow process and water environment, thus drawing increasing attention to river environment management. Previous research is mainly focused on flow through vegetation in a channel with fully covered single-layer vegetation. However, in natural rivers, different heights' vegetation often co-exists along one or two sides of a river. This paper experimentally studies how the flow velocity distribution is affected by the two different-layered vegetation allocated along two sides of an open-channel. The vegetation was simulated by dowels of two heights, 10 cm and 20 cm, and arranged in a parallel pattern along two sides of a flume under partially submerged conditions. The velocities along a cross-section were measured by Acoustic Doppler Velocimetry (ADV). The results of lateral velocity distribution show that a strong shear layer exists between vegetation and non-vegetation zones, indicating the retarding effect of vegetation. Meanwhile, as the flow depth increases, the relative velocity in the free flow zone decreases compared with that in the vegetated region, indicating that vegetation resistance to the flow decreases as increasing depth under the same vegetation configuration. These findings would help understand the role of multi-layered vegetation in riparian management.

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Section: Lateral Distribution Of Depth-averaged Velocitysupporting

confidence: 92%

Section: Lateral Distribution Of Depth-averaged Velocitymentioning

confidence: 88%

Section: Lateral Change Of Velocity Profilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Partially Covered Vegetation on the Lateral Velocity Distribution of Open Channel Flow

Tang¹,

Hu²

2021

GEP

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“…[20][21][22][23]). Most recently, Tang et al [24][25][26] conducted some experimental studies on the flow characteristics of a channel with two-layered vegetation that covered part of the channel bed. These results show that the velocity profiles are significantly different from those in singlelayered vegetation, and a large lateral velocity variation exists across the vegetation interface.…”

Section: Introductionmentioning

confidence: 99%

Discharge and velocity variation of flows in open channels partially covered with different layered vegetation

et al. 2021

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The role of vegetation in the natural environment has drawn great interest recently. The vegetation can change the velocity distribution due to its additional resistance on the flow, consequently affecting the nutrient and pollutant transport, and the habitats. Due to the complexity of flow and vegetation interaction, many previous researchers have studied the flow structure of channels with uniform vegetation. Few studies have been done on the flow of open channels partially covered vegetation of different heights on one side of the channel, which commonly exists in natural rivers. Through novel experiments for such a vegetated flow, this paper shows the influence of different layered vegetation on the velocity profile and discharge, which indicates that the velocity in the vegetation zone is significantly smaller than that in the free-flow zone and that the velocity profiles in the short and tall vegetation zones are very different. The flow through the free-flow zone is dominant (about 75%) despite its half width, and its discharge percentage slightly decreases as increasing flow depth.

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Flow behaviour in a multi‐layered vegetated floodplain region of a compound channel

Barman

Kumar

2022

Ecohydrology

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Riparian vegetation plays a crucial role in determining the flow behaviour in the channel. The effect of flow on the slope and main channel varies based on the size, type, and density of floodplain vegetation in a compound channel. Though real field vegetation distribution is non‐uniform, most studies mainly concentrate on uniformly distributed vegetation with fixed vegetation height. This paper attempts to address this issue through laboratory studies as it was not explored properly. Flow properties like velocity, Reynolds shear stress, turbulence intensities, and turbulent kinetic energy behave differently in heterogeneous vegetated channel compared with the homogeneous vegetated channel. These flow properties in the slopes and main channel section are more pronounced for uniformly distributed vegetation than non‐uniform distribution. The multi‐layered/varying vegetation height showed higher velocity, turbulent intensity, and turbulent kinetic energy than single‐layered/constant vegetation height on slopes and main channel sections. Integral scales (Taylor and Euler) analysis showed greater magnitude for uniform multi‐layered vegetation than non‐uniform multi‐layered vegetation. Further, the study of octant analysis reveals that internal outward and internal inward interaction events dominate the slope floodplain interaction section, which is not seen in no‐vegetation cases. These studies give a better perspective to understand flow in heterogenous vegetation and move closer to real field scenarios.

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Hydraulic characteristics of open-channel flow with partially-placed double layer rigid vegetation

Cited by 27 publications

References 34 publications

Impact of Partially Covered Vegetation on the Lateral Velocity Distribution of Open Channel Flow

Impact of Partially Covered Vegetation on the Lateral Velocity Distribution of Open Channel Flow

Discharge and velocity variation of flows in open channels partially covered with different layered vegetation

Flow behaviour in a multi‐layered vegetated floodplain region of a compound channel

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