The mechanism of energy loss and transition in a flow with submerged vegetation

Huai, Wenxin; Han, Jie; Geng, Chuan; Zhou, Jie; Chen, Qiuwen

doi:10.1016/j.advwatres.2010.03.006

Cited by 12 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vegetation restoration is an important technique for river restoration. By affecting flow velocity and the sediment deposition, aquatic plants have a great impact on the river [ 23 – 25 ]. At the same time, the reasonable distribution of vegetation in flow is also helpful to reduce the flood disaster and purify sewage [ 26 – 31 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic characteristics of submerged vegetation flow with non-constant vertical porosity

Zhao

Fan

2017

PLoS ONE

View full text Add to dashboard Cite

In order to investigate the influence of the vertical variation of porosity on open-channel flow with submerged vegetation, vertical non-homogeneous stumps and stems in submerged vegetation flow are simulated with truncated cones in a laboratory flume. First, porosity is defined as a function of water depth. A new governing equation for vegetation flow is established on the basis of the poroelastic media flow theory, and its analytical solution is obtained with the finite analytic method. Then, the fitting expression of permeability is established with experimental data, which shows the variation in permeability with vertical porosity and vegetation density. Finally, the calculated velocity distribution is compared with the measured velocity distribution. The theoretical results are in good agreement with the experimental data, which indicates that the theoretical formula accurately and practically predicts vertical velocity distribution in complex open-channel flow with submerged vegetation.

show abstract

Section: Resultsmentioning

confidence: 99%

Hydrodynamic characteristics of submerged vegetation flow with non-constant vertical porosity

Zhao

Fan

2017

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…As a part of the whole project, Huai et al [15,16] . recently discussed the mechanism of energy loss and transition in a flow with submerged vegetation.…”

Section: The Effects Of Parameters On Energy Relationsmentioning

confidence: 99%

Turbulent Flow in Wetlands with Submerged and Floating Vegetation

Zhao¹,

Xu²,

Han³

et al. 2011

JCP

View full text Add to dashboard Cite

Turbulent Flow in wetlands with submerged and floating aquatic plants was studied by applying Boit’s poroelastic theory to turbulent flow. The velocity distribution formulas were described by solving the modified Bessel equations. The effects of plant porosity and turbulent coefficient on the velocity distribution, shear stress distribution and energy relations were analytically derived. Several illustrative cases were given to show the details of the applications. The results of the study can help water resources, environmental and ecological engineers design and manage surface water flows in natural and constructed wetlands.

show abstract

“…Vegetation in shallow water flow contributes to the conservation of water resources (Kim et al, 2018;Mu et al, 2019;Liu et al, 2014). A submerged vegetation canopy modifies the time-averaged mean and turbulent flow significantly (Huai et al, 2010;Martino et al, 2012;Neary et al, 2012;Nepf, 2012;Sukhodolov & Sukhdolova, 2012;Wang et al, 2009;Zong & Nepf, 2010), thereby altering the movement and distribution pattern of fine sediment due to a combination of flow entrainment and turbulent diffusion (Hansen & Reidenbach, 2012;Iwasaki et al, 2015). Consequently, the profile of fine suspended sediment concentration (SSC) will change in submerged vegetated flow.…”

Section: Introductionmentioning

confidence: 99%

Profile of Suspended Sediment Concentration in Submerged Vegetated Shallow Water Flow

Xie

2020

Water Resources Research

View full text Add to dashboard Cite

The vertical distribution pattern of the fine suspended sediment concentration (SSC) plays an important role in the aquatic ecosystem of shallow water. To investigate the SSC profile in submerged vegetated river flow, a series of indoor flume experiments was conducted. Glass spherical balls of three different diameters (40, 77, and 90 μm) with a uniform specific gravity of 2.5 were used for the model sediments. A set of sampling devices was designed for the simultaneous measurements of SSCs at multipoints along a vertical line. Experimental results show that the SSC profile was re-distributed in the vegetated region, gradually forming a new equilibrium pattern in the overcanopy flow layer with its maximum occurring near the canopy top. From this maximum point near the canopy top, the suspended sediment formed a dynamic balance between upward turbulent diffusion and downward gravitational settling. Meanwhile, the momentum diffusivity was observed to linearly decrease upward from the maximum-SSC elevation toward the water surface, thereby allowing us to deduce an empirical negative linear formula. Based on the convection-diffusion equilibrium mechanism and with assistance of the empirical formula of flow momentum diffusivity, a new form of the Rouse formula was derived for the overcanopy flow layer. In general, this equation agrees well with the measured data. Some undercalculated deviations appear in the well-above canopy zone due to the upskewed turbulence and the weak upward secondary flow. This deviation decreases with increasing sediment diameter. The bed deposition mainly comes from the deep part of canopy-occupied flow layer.

show abstract

The mechanism of energy loss and transition in a flow with submerged vegetation

Cited by 12 publications

References 14 publications

Hydrodynamic characteristics of submerged vegetation flow with non-constant vertical porosity

Hydrodynamic characteristics of submerged vegetation flow with non-constant vertical porosity

Turbulent Flow in Wetlands with Submerged and Floating Vegetation

Profile of Suspended Sediment Concentration in Submerged Vegetated Shallow Water Flow

Contact Info

Product

Resources

About