Effects of secondary current and stratification on suspension concentration in an open channel flow

Kundu, Snehasis; Ghoshal, Koeli

doi:10.1007/s10652-014-9341-8

Cited by 36 publications

(17 citation statements)

References 48 publications

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“…The experimental data set of Coleman () has been used extensively for the validation purposes of sediment concentration models (Bose & Dey, ; Ghoshal & Kundu, ; Kundu & Ghoshal, ) and also streamwise velocity laws (Guo & Julien, ; Absi, ). In this study, Runs 12, 27 and 34 from the experimental data set of Coleman are selected, each one representing different bed roughness values.…”

Section: Resultsmentioning

confidence: 99%

Distribution of suspended sediment concentration in wide sediment‐laden streams: A novel power‐law theory

2016

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The diffusion equation of suspended sediment concentration in a wide sediment-laden stream flow is dependent on the vertical gradient of streamwise velocity and the sediment diffusivity. This study aims at investigating the influence of the streamwise velocity laws on the suspended sediment concentration distributions, resulting from the solution of the diffusion equation. Firstly, the sediment concentration distributions are obtained numerically from the solution of the diffusion equation using different velocity laws and compared with the experimental data. It is found that the power-law approximation produces good computational results for the concentration distributions. The accuracy of using a power-law velocity model is comparable with the results obtained from other classical velocity laws, namely log-law, log wake-law and stratified log-law. Secondly, a novel analytical solution is proposed for the determination of sediment concentration distribution, where a power-law, wall-concentration profile is coupled with a concentration wake function. The power-law model (for velocity and concentration) is calibrated using the experimental data, and then a generalized wake function is obtained by choosing a suitable law. The developed powerlaw model involving the wake function adjusted by an exponent predicts the sediment concentration distributions quite satisfactorily. Finally, a new explicit formula for the suspended-load transport rate is derived from the proposed theory, where numerical computation of integrals, as needed in the Einstein theory, is avoided.

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Section: Resultsmentioning

confidence: 99%

Distribution of suspended sediment concentration in wide sediment‐laden streams: A novel power‐law theory

2016

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“…Transport of sediment in open channel flow has long been an important area of research in fluvial hydraulics [1][2][3][4][5][6][7][8][9][10][11] and has wide application in industry and geophysical research. Better understanding of sediment transport mechanism in natural watercourses needs knowledge of open channel flow.…”

Section: Introductionmentioning

confidence: 99%

“…Greimann and Holly Jr [13], Jian et al [14], Zhong et al [15] developed models on the basis of two phase flow approach. Out of many other studies, some [16,17] included effect of stratification, some [8,18] included effect of secondary current and some [19,20] included effect of concentration in the mixing length. Recently Pal and Ghoshal [21] developed a model on suspended sediment distribution in an open channel turbulent flow by taking into account different prominent hydrodynamics mechanisms and compared their model with a broad range of previously published models.…”

Section: Introductionmentioning

confidence: 99%

Vertical sediment concentration distribution revisited with shear-induced diffusivity: An explicit series solution based on homotopy analysis method

Jain,

Kumbhakar,

Ghoshal

2020

Preprint

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The present study revisits the vertical distribution of suspended sediment concentration in an open channel flow with a special attention to sediment diffusion coefficient. If turbulent diffusivity is considered to follow a parabolic-type profile, the diffusivity coefficient is zero at the bed and very small near the bed; so alone it may not be enough to diffuse the particles from bed-load layer to suspension region. Leighton & Acrivos (J.

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“…Finally, Yang, Ghoshal and Kundu investigated the effect of secondary currents in terms of fluid vertical velocity and concentration distribution [27][28][29]. Yang developed a model aimed at the simultaneous prediction of velocity and sediment concentration profile [27], based on the re-examination of Prandtl's theory for sediment-laden flows and the condition of nonzero wall-normal velocity induced by secondary currents and sediment settlement.…”

Section: Introductionmentioning

confidence: 99%

“…Yang developed a model aimed at the simultaneous prediction of velocity and sediment concentration profile [27], based on the re-examination of Prandtl's theory for sediment-laden flows and the condition of nonzero wall-normal velocity induced by secondary currents and sediment settlement. Ghoshal and Kundu elaborated a mathematical model for the sediment concentration distribution in steady uniform flow that incorporates the effect of both secondary currents and sediment-induced stratification [28,29]. They found that the stratification leads to a decrease in sediment concentration, while secondary currents might influence sediment-laden flow by either increasing or decreasing its concentration.…”

Section: Introductionmentioning

confidence: 99%

Simplified Entropic Model for the Evaluation of Suspended Load Concentration

Mirauda

Vincenzo

Pannone

2018

Water

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Suspended sediment concentration is a key aspect in the forecasting of river evolution dynamics, as well as in water quality assessment, evaluation of reservoir impacts, and management of water resources. The estimation of suspended load often relies on empirical models, of which efficiency is limited by their analytic structure or by the need for calibration parameters. The present work deals with a simplified fully-analytical formulation of the so-called entropic model in order to reproduce the vertical distribution of sediment concentration. The simplification consists in the leading order expansion of the generalized spatial coordinate of the entropic velocity profile that, strictly speaking, applies to the near-bed region, but that provides acceptable results also near the free surface. The proposed closed-form solution, which highlights the interplay among channel morphology, stream power, secondary flows, and suspended transport features, allows reducing the needed number of field measurements and, therefore, the time of field activities. Its accuracy and robustness were successfully tested based on the comparison with laboratory data reported in literature.

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Effects of secondary current and stratification on suspension concentration in an open channel flow

Cited by 36 publications

References 48 publications

Distribution of suspended sediment concentration in wide sediment‐laden streams: A novel power‐law theory

Distribution of suspended sediment concentration in wide sediment‐laden streams: A novel power‐law theory

Vertical sediment concentration distribution revisited with shear-induced diffusivity: An explicit series solution based on homotopy analysis method

Simplified Entropic Model for the Evaluation of Suspended Load Concentration

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