Modeling the longitudinal profiles of streamwise velocity in an open channel with a model patch of vegetation

Yan, Chunhao; Shan, Yuqi; Sun, Wen‐Yih; Liu, Xingnian

doi:10.1007/s10652-020-09747-5

Cited by 21 publications

(11 citation statements)

References 51 publications

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“…Truong & Uijttewaal, 2018; White & Nepf, 2008), velocity prediction models (e.g. Liu & Shan, 2019; Liu et al., 2020; Yan et al., 2020) and numerical simulations (e.g. Xiao et al., 2020; Xiaohui & Li, 2002; Xu et al., 2019) have been conceptualized, designed, calibrated and tested with reference to cylinders or rod‐like rigid vegetation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Flexible and Rigid Vegetation Induced Shear Layers in Partly Vegetated Channels

Caroppi

Västilä

Gualtieri

et al. 2021

Water Resources Research

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In a variety of environmental settings, including vegetated channel banks and rivers, and their associated floodplains and riparian areas, vegetation occurs along river margins, partially obstructing the cross-section. In these systems, referred to as partly vegetated channels, the long regions of finite width of emergent vegetation laterally interact with the flow, deeply altering the mean and turbulent flow structure with implications on the conveyance capacity of the channel, the water levels, and the mass and momentum exchange processes (

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Section: Introductionmentioning

confidence: 99%

Comparison of Flexible and Rigid Vegetation Induced Shear Layers in Partly Vegetated Channels

Caroppi

Västilä

Gualtieri

et al. 2021

Water Resources Research

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“…While the evaluation of flow resistance with reference to river reach is of considerable importance, it must be said that even the effect of vegetation patches exert considerable influence on flow resistance, on velocity distribution, and solid transport, and this is also a field of further research as witnessed by recent publications [34][35][36][37][38]. The kinetics of vegetation in terms of establishment, growth, and decay of riparian vegetation in response to dynamic hydraulic conditions are also beginning to be of interest to researchers [45,142].…”

Section: Future Research and Conclusionmentioning

confidence: 99%

Flow Resistance in Open Channel Due to Vegetation at Reach Scale: A Review

D’Ippolito

Calomino

Alfonsi

et al. 2021

Water

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Vegetation on the banks and flooding areas of watercourses significantly affects energy losses. To take the latter into account, computational models make use of resistance coefficients based on the evaluation of bed and walls roughness besides the resistance to flow offered by vegetation. This paper, after summarizing the classical approaches based on descriptions and pictures, considers the recent advancements related to the analytical methods relative both to rigid and flexible vegetation. In particular, emergent rigid vegetation is first analyzed by focusing on the methods for determining the drag coefficient, then submerged rigid vegetation is analyzed, highlighting briefly the principles on which the different models are based and recalling the comparisons made in the literature. Then, the models used in the case of both emergent and submerged rigid vegetation are highlighted. As to flexible vegetation, the paper reminds first the flow conditions that cause the vegetation to lay on the channel bed, and then the classical resistance laws that were developed for the design of irrigation canals. The most recent developments in the case of submerged and emergent flexible vegetation are then presented. Since turbulence studies should be considered as the basis of flow resistance, even though the path toward practical use is still long, the new developments in the field of 3D numerical methods are briefly reviewed, presently used to assess the characteristics of turbulence and the transport of sediments and pollutants. The use of remote sensing to map riparian vegetation and estimating biomechanical parameters is briefly analyzed. Finally, some applications are presented, aimed at highlighting, in real cases, the influence exerted by vegetation on water depth and maintenance interventions.

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“…Flume experiments based on model vegetation, which is simulated by cylinder or strip arrays, have been employed for two decades (Ben Meftah & Mossa, 2016; Ghisalberti & Nepf, 2004; Huai et al, 2015; Liu et al, 2020; Nepf & Vivoni, 2000; Nezu & Onitsuka, 2001; Shan et al, 2020; Wang, Liu, et al, 2021; Yan et al, 2015; Yan et al, 2016; Yan et al, 2020). By changing the flow depth, submerged and emergent vegetation canopies can be modelled (Chang et al, 2020; Li et al, 2014; Yan et al, 2016), and by changing the obstruction ratio of the flume, partially distributed and fully distributed vegetation canopies can be modelled (Xu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic adjustment subject to a submerged canopy partially obstructing a flume: Implications for junction flow behaviour

Yan

Jia

Fang³

et al. 2023

Ecohydrology

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The scenario of a submerged canopy partially obstructing a channel is common in the natural aquatic flow environment. This study experimentally evaluated the flow adjustment performance and vertical flow structure adaptive to a submerged partially distributed canopy. The experimental results showed that the canopy interior velocity adjustment distance for submerged partially distributed canopies was comparable with that for emergent ones. However, it was smaller than that for submerged fully distributed canopies but comparable with that for emergent fully distributed ones. For the fully developed flow, the neighbouring open waters insignificantly impact the flow structure in the vegetation region (VR), where the mixing-layer flow behaviour arising from the generation of the vertical coherent vortices was maintained. The vertical mixing-layer flow behaviour characterised by pronounced vertical Reynolds shear stress transversely extended into the nonobstructed region, suggesting that the canopy-side waters significantly impacted the neighbouring open flow. This effect decayed in the case of decreasing canopy density and as the location leaving the junction region (JR). Of importance was that near-bed velocity deflection occurred in the JR and was facilitated by canopy density. Vertically nonuniform distribution of transverse momentum exchange from horizontal coherent vortices due to bed depression can account for the near-bed velocity deflection. The gained knowledge allowed the development of a phenomenological model for understanding the vertical flow structure in partially vegetated channels.

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Modeling the longitudinal profiles of streamwise velocity in an open channel with a model patch of vegetation

Cited by 21 publications

References 51 publications

Comparison of Flexible and Rigid Vegetation Induced Shear Layers in Partly Vegetated Channels

Comparison of Flexible and Rigid Vegetation Induced Shear Layers in Partly Vegetated Channels

Flow Resistance in Open Channel Due to Vegetation at Reach Scale: A Review

Hydrodynamic adjustment subject to a submerged canopy partially obstructing a flume: Implications for junction flow behaviour

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