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Analytical model for vertical velocity profiles in flows with submerged shrub-like vegetation
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In this article, an analytical solution for the vertical profiles of the horizontal velocity of channel flow with submerged shrub-like vegetation is investigated, and the velocity distribution of the whole column is determined in tandem with the logarithmic velocity profile above the vegetation.Abstract:
An analytical solution for the vertical profiles of the horizontal velocity of channel flow with submerged shrub-like vegetation is investigated in this paper. At first, a shape function is proposed to fit the diameter change of different types of shrub-like vegetation. Using the momentum theorem and the mixing-length turbulence model, an analytical solution for the vertical profile of the horizontal velocity within the vegetation is obtained. The velocity distribution of the whole column is determined in tandem with the logarithmic velocity profile above the vegetation. The solution is compared with experimental data in excellent agreement. The results show that the flow above the vegetation has a logarithmic velocity profile while the flow within the vegetation is impacted greatly by the shape and density of vegetation. The flows within shrub-like vegetations are non-uniform and vary inversely with the shrub diameter.read more
Citations
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Journal ArticleDOI
Analytical model of the mean velocity distribution in an open channel with double-layered rigid vegetation
TL;DR: In this article, an analytical model for predicting the vertical distribution of mean streamwise velocity in an open channel with double-layered rigid vegetation is proposed, and good agreement between the analytical predictions and experimental data demonstrated the validity of the model.
Journal ArticleDOI
Two-layer model for open channel flow with submerged flexible vegetation
TL;DR: In this paper, a two-layer model for predicting the vertical distribution of stream-wise velocity in open channel flow with submerged flexible vegetation is proposed using the predicted deflection height of the flexible vegetation determined via the large-deflection cantilever beam theory, the flow is vertically separated into a bottom vegetation layer and an upper free water layer, and corresponding momentum equations for each layer are formulated.
Journal ArticleDOI
Characteristics of flow structure of free-surface flow in a partly obstructed open channel with vegetation patch
TL;DR: In this article, the hydrodynamics of free-surface flow in a rectangular channel with a bed of rigid vegetation-like cylinders occupying half of the channel bed was investigated and interpreted by means of laboratory experiments and numerical simulations.
Journal ArticleDOI
Submerged flexible vegetation impact on open channel flow velocity distribution: An analytical modelling study on drag and friction
Jaan H. Pu,Awesar Hussain,Yakun Guo,Nikolaos Vardakastanis,Prashanth Reddy Hanmaiahgari,Dennis Lam +5 more
TL;DR: In this article, an analytical model that represents the streamwise velocity distribution for open channel flow with submerged flexible vegetation is studied, and a sensitivity analysis has been conducted to assess the influences of the drag (C D ) and friction (C f ) coefficients on the flow velocity.
Journal ArticleDOI
Analytical solutions of velocity profile in flow through submerged vegetation with variable frontal width
TL;DR: In this article, a new shape function is proposed for vegetation with variable frontal width in the vertical direction, where the frontal width exhibits a gradual increase in vertical direction from bottom up in the vegetation.
References
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Journal ArticleDOI
Three-layer model for vertical velocity distribution in open channel flow with submerged rigid vegetation
TL;DR: In this paper, a three-layer model is proposed to predict the vertical velocity distribution in an open channel flow with submerged vegetation, and the results show that the velocity profile consists of three hydrodynamic regimes (i.e., the upper non-vegetated layer, the outer and bottom layer within vegetation); accordingly different methods had been adopted to describe the vertical velocities distribution.
Analytical model for hydraulic roughness of submerged vegetation
TL;DR: In this article, a new, analytical, physically based, model of the vertical flow velocity profile and the hydraulic roughness of submerged vegetation has been developed, which can be easily incorporated in numerical hydraulic software packages.
Journal Article
Vertical velocity distribution of longitudinal flow in a vegetated channel
TL;DR: In this article, the effects of vertical changes in vegetation characteristics on the vertical flow velocity distribution were studied in a natural wetland ecotone modeled by shrubs mounted in a flume with five velocity profile measurements in the longitudinal direction.
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