Detached eddy simulation of flow through a circular patch of free-surface-piercing cylinders

Zhang, Jingxin; Liang, Dongfang; Fan, Xiang; Liu, Hua

doi:10.1016/j.advwatres.2018.11.008

Cited by 21 publications

(10 citation statements)

References 35 publications

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“…However, in rivers and shallow lakes, aquatic plants often exist in patches with limited size and appear to be approximately circular [83][84] . Compared with the flow in fully vegetated channels, the flow through and around limited vegetation patches is more complicated [85][86][87][88][89][90][91] and has been the subject of detailed experiments recently [89] . As the incoming flow approaches the vegetation patch, the flow deflects laterally to both sides, and more importantly, a portion of the incoming flow passes through the vegetation patch, known as "bleeding flow".…”

Section: Flow Through and Around Finite Vegetation Patchesmentioning

confidence: 99%

“…The estimation of incipient sediment motion in vegetated open channel flow plays a significant role in protecting riverbed from erosion and sediment transport as well as restoring ecological function. However, only a few studies have investigated the incipient sediment motion in flows with vegetation [24,[80][81][82][83][84][85] .…”

Section: Incipient Sediment Motion In the Vegetated Flowmentioning

confidence: 99%

“…The above analysis reveals that the rule of incipient sediment motion in vegetated open channel flow is remarkably different from that in nonvegetated open channel flow and requires a separate treatment. Considering the difficulty in using bed shear stress to judge incipient sediment motion in vegetated open channel flow, the critical flow velocity is more convenient and is routinely employed [24,[80][81][82][83]85] . The experimental conditions and proposed models are summarized in Table 2.…”

Section: Predictive Model For the Incipient Sediment Motionmentioning

confidence: 99%

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Flow dynamics and sediment transport in vegetated rivers: A review

et al. 2021

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The significance of riparian vegetation on river flow and material transport is not in dispute. Conveyance laws, sediment erosion and deposition, and element cycling must all be adjusted from their canonical rough-wall boundary layer to accommodate the presence of aquatic plants. In turn, the growth and colonization of riparian vegetation are affected by fluvial processes and river morphology on longer time scales. These interactions and feedbacks at multiple time scales are now drawing significant attention within the research community given their relevance to river restoration. For this reason, a review summarizing methods, general laws, qualitative cognition, and quantitative models regarding the interplay between aquatic plants, flow dynamics, and sediment transport in vegetated rivers is in order. Shortcomings, pitfalls, knowledge gaps, and daunting challenges to the current state of knowledge are also covered. As a multidisciplinary research topic, a future research agenda and opportunities pertinent to river management and enhancement of ecosystem services are also highlighted.

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Section: Flow Through and Around Finite Vegetation Patchesmentioning

confidence: 99%

Section: Incipient Sediment Motion In the Vegetated Flowmentioning

confidence: 99%

Section: Predictive Model For the Incipient Sediment Motionmentioning

confidence: 99%

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Flow dynamics and sediment transport in vegetated rivers: A review

et al. 2021

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“…We newly find that the conclusion proposed by Zhang et al, (2019) is merely valid for 0<SVF<10.4%. By contrast, in the subrange for 10.4%<SVF<20%, the dimensionless frequency may increase with the rising of the SVF.…”

Section: Local Stems' Drag Rising Phenomenon In a Vpmentioning

confidence: 63%

“…More data were collected from literature (Zhang et al, 2019, Chang and Constantinescu, 2015, Nicolle and Eames, 2011 and plotted together with the present results in Fig. 20.…”

Section: Local Stems' Drag Rising Phenomenon In a Vpmentioning

confidence: 99%

A numerical study on the influence of curvature ratio and vegetation density on a partially vegetated U-bend channel flow

Wang

Avital

Korakianitis³

et al. 2021

Advances in Water Resources

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Influence of vegetation lodging on the flow regime and resistance characteristic of overland flow

Zhang

Wang

et al. 2023

Hydrological Processes

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Vegetation lodging downstream under overland flow is a common phenomenon; it changes the characteristics of the overland flow regime and causes the resistance effect. At present, there are few studies on the hydraulic characteristics of the slope flow caused by vegetation lodging, and the problem of the flow resistance of the vegetation morphology has been neglected or simplified, which is likely to cause large deviations in overland flow forecast. To clarify the effect of vegetation lodging on overland flow, under the conditions of slope (0.0%–3.0%) and flow discharge (0.0005–0.008 m3/s), an indoor flume experiment of vegetation gradient lodging combination and lodging angle was carried out, and the resistance mechanism and flow regime characteristics were compared and discussed. The results show that it is reasonable to use a uniform lodging angle to simulate the influence of gradient lodging on the overland flow resistance. The slope and vegetation lodging states are important factors that affect the evolution of flow patterns and turbulence changes. It was found that, as the slope or degree of vegetation lodging increased, the flow patterns evolved from slow to rapid. Under the same flow discharge, the resistance of overland flow decreased with an increase in the vegetation lodging angle. Under unsubmerged conditions, the resistance coefficient f was found to be positively correlated with the Reynolds number Re and the cosine of the lodging angle θ, and negatively correlated with the slope S. Compared with vertical vegetation, the morphological resistance of vegetation with lodging angles of 20°, 40°, 60°, and 80° decreased by 10.28%, 32.53%, 52.45%, and 61.37%, respectively. The morphology of vegetation lodging is the main influencing factor that constitutes flow resistance and controls hydraulic erosion. This study provides a theoretical basis for the prediction of overland flow and soil erosion control.

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Detached eddy simulation of flow through a circular patch of free-surface-piercing cylinders

Cited by 21 publications

References 35 publications

Flow dynamics and sediment transport in vegetated rivers: A review

Flow dynamics and sediment transport in vegetated rivers: A review

A numerical study on the influence of curvature ratio and vegetation density on a partially vegetated U-bend channel flow

Influence of vegetation lodging on the flow regime and resistance characteristic of overland flow

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