Flow dynamics and sediment transport in vegetated rivers: A review

Huai, Wenxin; Li, Shuolin; Katul, Gabriel G.; Liu, Meng-Yang; Yang, Zhonghua

doi:10.1007/s42241-021-0043-7

Cited by 151 publications

(49 citation statements)

References 211 publications

(292 reference statements)

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“…Recently, the research community has focused extensively on the transport and diffusion processes of the sediment in vegetated rivers (Huai et al., 2021) and evaluation of the vertical distribution of the SSC. Several prediction models have been proposed based on the diffusion theory, gravitational theory and random displacement model (Huai et al., 2020, Huai, Yang, et al., 2019; D. Li et al., 2018, 2020; Y. Li et al., 2020a, 2020b; Tseng & Tinoco, 2021; Yang & Choi, 2010).…”

Section: Introductionmentioning

confidence: 99%

Study of Suspended Sediment Diffusion Coefficients in Submerged Vegetation Flow

Yang

Guo

2022

Water Resources Research

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The traditional profile model of the sediment diffusion coefficient (εs ${\varepsilon }_{s}$), which is parabolic along the water depth, cannot precisely predict the vertical distribution of εs ${\varepsilon }_{s}$ in vegetated flow. Therefore, in this study, a series of flume experiments were conducted to clarify the influence of submerged vegetation on the diffusion characteristics of suspended load particles. First, the submerged canopy increases the efficiency of momentum exchange but restrains the vertical diffusion of suspended sediment, indicating that the presence of submerged plants promotes the siltation of solid particles. Second, the depth‐averaged sediment diffusion coefficient (εstrue¯ $\bar{{\varepsilon }_{s}}$) monotonically decreases with increasing relative water depth, while the depth‐averaged momentum exchange coefficient (εmtrue¯ $\bar{{\varepsilon }_{m}}$) presents two opposite trends, likely owing to the dominant turbulence event changing from ejections to sweeps and the different variation tendencies of the velocity gradient and Reynolds shear stress with increasing vegetation density. Compared with the ratio (β $\beta $) of εs ${\varepsilon }_{s}$ to the momentum exchange coefficient in nonvegetated flow, β $\beta $ in submerged canopy flow is significantly less than 1, which means that the solid particles diffuse less readily than liquid particles because of the stem‐scale vortices generated by the vegetation. In addition, vertical profile models of εs ${\varepsilon }_{s}$ and suspended sediment concentration were proposed and validated by experimental data. The models exhibit a high accuracy, correlation and applicability and can provide critical information to promote research on riverbed deformation and nutrient dynamics in vegetated rivers, wetlands and estuaries.

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Section: Introductionmentioning

confidence: 99%

Study of Suspended Sediment Diffusion Coefficients in Submerged Vegetation Flow

Yang

Guo

2022

Water Resources Research

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“…(2019, 2020); Tseng and Tinoco (2020); Huai et al. (2021). High SSC can intercept photosynthetically active radiation necessary for sustaining submerged aquatic plants in lakes and rivers.…”

Section: Introductionmentioning

confidence: 99%

A Co‐Spectral Budget Model Links Turbulent Eddies to Suspended Sediment Concentration in Channel Flows

Bragg

Katul

2022

Water Resources Research

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The vertical distribution of suspended sediment concentration remains a subject of active research given its relevance to a plethora of problems in hydraulics, hydrology, ecology, and water quality control. Many of the classical theories developed over the course of 90 years represent the effects of turbulence on suspended sediments (SS) using an effective mixing length or eddy diffusivity without explicitly accounting for the energetics of turbulent eddies across scales. To address this gap, the turbulent flux of sediments is derived using a co‐spectral budget (CSB) model that can be imminently used in SS and other fine particle transport models. The CSB closes the pressure‐redistribution effect using a spectral linear Rotta scheme modified to include isotropization of production and interactions between turbulent eddies and sediment grains through a modified scale‐dependent de‐correlation time. The result is a formulation similar in complexity to the widely used Rouse's equation but with all characteristic scales, Reynolds number, and Schmidt number effects derived from well‐established spectral shapes of the vertical velocity and accepted constants from turbulence models. Finally, the proposed CSB model can recover Prandtl's and Rouse's equations under restricted conditions.

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“…Tinoco et al [4] classify intrusive approaches (acoustic Doppler velocimeters, optical backscatter sensors, ultrasonic velocity profilers, and acoustic Doppler current profilers) and non-intrusive techniques (laser-induced fluorescence, particle image velocimetry, and laser Doppler velocimetry) to detect the magnitude of the flow disturbance by the experimental probe itself. Detailed reviews about methods to measure and estimate shear stress can be found in Huai et al [5]. Experimental setups range from large-scale measurements (e.g., Errico et al [6]) to highly controlled laboratory-based experiments (e.g., Duan et al [7] and Bashirzadeh et al [8]).…”

Section: Introductionmentioning

confidence: 99%

Force Measurement with a Strain Gauge Subjected to Pure Bending in the Fluid–Wall Interaction of Open Water Channels

2022

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An experimental method to measure forces of small magnitude with a strain gauge as a force sensor in the fluid–wall interaction of open water channels is presented. Six uniaxial strain gauges were employed for this purpose, which were embedded across the entire sensing area and subjected to pure bending, employing two-point bending tests. Sixteen two-point bending tests were performed to determine the existence of a direct relationship between the load and the instrument signal. Furthermore, a regression analysis was used to estimate the parameters of the model. A data acquisition system was developed to register the behavior of the strain gauge relative to the lateral displacement induced by the loading nose of the universal testing machine. The results showed a significant linear relationship between the load and the instrumental signal, provided that the strain gauge was embedded between 30% and 45% of the central axis in the sensing area of the sensor (R2 > 0.99). Thus, the proposed sensor can be employed to measure forces of small magnitude. Additionally, the linear relationship between the load and the instrumental signal can be used as a calibration equation, provided that the strain gauge is embedded close to the central axis of the sensing area.

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Flow dynamics and sediment transport in vegetated rivers: A review

Cited by 151 publications

References 211 publications

Study of Suspended Sediment Diffusion Coefficients in Submerged Vegetation Flow

Study of Suspended Sediment Diffusion Coefficients in Submerged Vegetation Flow

A Co‐Spectral Budget Model Links Turbulent Eddies to Suspended Sediment Concentration in Channel Flows

Force Measurement with a Strain Gauge Subjected to Pure Bending in the Fluid–Wall Interaction of Open Water Channels

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