Flow characteristics within different configurations of submerged flexible vegetation

Chen, Su‐Chin; Kuo, Yi‐Ming; Li, Yu-Hsiu

doi:10.1016/j.jhydrol.2010.12.018

Cited by 76 publications

(63 citation statements)

References 37 publications

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“…The existence of many scales of chaotic motion makes turbulent flow phenomena very complex and difficult to predict, even for the most basic situations. The protrusion of a structure constructed in a riverbed or on the lateral bank in the main channel of a river reduces the width of the water course and disturbs the flow and sediment transport (Chen et al 2011(Chen et al , 2012. The flow at the upstream face of a structure is accelerated as it moves past the obstacle, creating a trailing vortex over the structure and wake vortices near the bed at the downstream face (Dey et al 2008;Lim 1997;Liu and Shen 2008).…”

Section: Instrumentation Techniques and Feasibilitymentioning

confidence: 99%

“…The flow at the upstream face of a structure is accelerated as it moves past the obstacle, creating a trailing vortex over the structure and wake vortices near the bed at the downstream face (Dey et al 2008;Lim 1997;Liu and Shen 2008). The presence of a solid structure strongly induces 3-D flow (Chen et al 2011(Chen et al , 2012. Radical research of turbulence behavior requires a 3-D velocity measuring instrument with the requisite spatial and temporal resolution.…”

Section: Instrumentation Techniques and Feasibilitymentioning

confidence: 99%

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Turbulence study in the vicinity of piano key weir: relevance, instrumentation, parameters and methods

Tiwari

Sharma

2015

Appl Water Sci

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This research paper focuses on the need of turbulence, instruments reliable to capture turbulence, different turbulence parameters and some advance methodology which can decompose various turbulence structures at different levels near hydraulic structures. Small-scale turbulence research has valid prospects in open channel flow. The relevance of the study is amplified as we introduce any hydraulic structure in the channel which disturbs the natural flow and creates discontinuity. To recover this discontinuity, the piano key weir (PKW) might be used with sloped keys. Constraints of empirical results in the vicinity of PKW necessitate extensive laboratory experiments with fair and reliable instrumentation techniques. Acoustic Doppler velocimeter was established to be best suited within range of some limitations using principal component analysis. Wavelet analysis is proposed to decompose the underlying turbulence structure in a better way.

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Section: Instrumentation Techniques and Feasibilitymentioning

confidence: 99%

Section: Instrumentation Techniques and Feasibilitymentioning

confidence: 99%

Turbulence study in the vicinity of piano key weir: relevance, instrumentation, parameters and methods

Tiwari

Sharma

2015

Appl Water Sci

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“…Determining the momentum absorbing area is a topic of significant concern. In some previous studies, the total momentum absorbing area is represented by the total frontal area of plants [21,22]. However, because wetted leaves spread in the flow direction in water, considerable foliage area is hidden behind the frontal area.…”

Section: Vegetation Densitymentioning

confidence: 99%

Hydraulic Features of Flow through Emergent Bending Aquatic Vegetation in the Riparian Zone

Xia

Nehal

2013

Water

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Vegetation in riparian zones has a significant influence on resistance, velocity distribution and turbulence intensity. This study experimentally investigated the effect of emergent bending riparian zone vegetation on the flow. The results showed that the frond and stem parts of Acorus calami had different influences on hydraulic features and that the relative depth ratio of water depth h to stem height h s was a key determinant of those influences. Manning coefficient n varied greatly with the variation of vegetation densities, relative depth ratio of water depth h to stem height h s , Re and Fr. Manning coefficient n increased with increasing vegetation density, particularly in cases when h/h s > 1. The velocity distributions did not follow logarithmic profiles, but they instead exhibited double logarithmic profiles. In addition, vegetation characteristics were shown to influence the height of maximum velocity. The position of maximum velocity is further away from the bed in cases with denser vegetation distribution. Finally, turbulence intensity showed more significant variation in the stem part and peaked near the middle of the stem, at z/h s = 0.5, where z was the distance from the bottom.

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“…It can be assumed that vegetation defines the flow conditions in the channel during periods of high discharge. Flow conditions at various plant configurations were also investigated among others by [6][7][8][9][10]. Yang et al [11] studied the hydraulic characteristics of overland flow.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Shrubby Floodplain Vegetation Growth on the Discharge Capacity of River Valleys

Walczak

Kałuża

et al. 2018

Water

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Willow bush growing in floodplains is a dominant form of vegetation in lowland river valleys due to the availability of water and light. Uncontrolled growth of this plant results in a lower capacity of floodplain areas. Vegetation can narrow the active width of water flow, as well as change water flow velocities at hydrometric verticals falling within the floodplain and the main channel. This paper analyses the impact of long-term growth of willow shrubs on flow resistance coefficient values. Both an increase in the average diameter and the density characterised by the average distance between branches have a significant impact on reducing the flow. The adopted research variants were based on data on the growth rate of the most popular species and forms of willow found in the floodplains of the Warta River above the Jeziorsko reservoir. Two research scenarios were analysed, including data from 12 years, on the development of floodplain vegetation. The first scenario included only the change in diameter (vegetation grew on a cultivation plot), whereas the density remained constant. The second scenario investigated the inverse model-vegetation growing in an uncontrolled manner. The analysis of the tests proved the impact of various bush development scenarios on flow conditions. The results, referred to in the available research papers, indicated the importance of the dynamics of shrub development to the local flow conditions. It was stated that reduction in the flow, depending on the analysed scenario, could reach 45% for scenarios in which the only considered factor was the increase in diameter (at a constant density), and up to 70% in the case of increase in the density of vegetation. Thorough knowledge of this phenomenon may help manage and maintain natural river valleys.

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Flow characteristics within different configurations of submerged flexible vegetation

Cited by 76 publications

References 37 publications

Turbulence study in the vicinity of piano key weir: relevance, instrumentation, parameters and methods

Turbulence study in the vicinity of piano key weir: relevance, instrumentation, parameters and methods

Hydraulic Features of Flow through Emergent Bending Aquatic Vegetation in the Riparian Zone

The Impact of Shrubby Floodplain Vegetation Growth on the Discharge Capacity of River Valleys

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