Suspended sediment concentration profiles using conservation laws

Aziz, Nadim M.; Prasad, S. N.; Bhattacharya, S.

doi:10.1080/00221689209498899

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…The findings from the present study concur with prior findings [ Squires and Eaton , 1990; Elghobashi , 1994; Kaftori et al , 1998; Rouson and Eaton , 2001], in revealing that key assumptions associated with the customary approach are questionable. The implications of the questionable assumptions have been little checked, though Aziz et al [1992], for example, demonstrates that neglect of the velocity lag might result in overestimation of suspended sediment load by up to 40%.…”

Section: Implications For Sediment Transportmentioning

confidence: 99%

Two‐phase versus mixed‐flow perspective on suspended sediment transport in turbulent channel flows

Muste

Fujita

et al. 2005

Water Resources Research

109

101

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[1] The present paper reports results obtained with image velocimetry to provide new insights into the two-phase nature of sediment-laden flows. The resulting two-phase flow perspective is compared with the traditional mixed-flow (or combined phase) perspective that treats sediment-laden flows essentially as flow of a single fluid. The insights are from flume experiments entailing the use of fully suspended natural sand and neutrally buoyant particles conveyed in a turbulent open channel flow of water. They confirm that suspended particles (irrespective of particle density) may affect a turbulent flow throughout its depth. Suspended particles modify flow turbulence, the main effects quantified being decreases in the bulk water velocity and in the von Kárman constant, while the flow's friction velocity remains approximately constant. Comparison of the results obtained with the two particle densities reveals differences in particle influences on water flow. In the flows conveying sand the characteristics of water and particle movement are strongly coupled, yet distinct; that is, there is a lag in the mean velocity between local water and particle movement, and intensities of water turbulence differ from intensities of particle motion turbulence. These results confirm and extend prior two-phase flow perspectives on suspended-particle transport and indicate the inaccuracies in some assumptions associated with the mixed fluid formulation of suspended-particle transport.

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Section: Implications For Sediment Transportmentioning

confidence: 99%

Two‐phase versus mixed‐flow perspective on suspended sediment transport in turbulent channel flows

Muste

Fujita

et al. 2005

Water Resources Research

109

101

View full text Add to dashboard Cite

show abstract

“…This assumes that the sediment travels at the same speed as the water. This assumption has recently been brought into question by experimental work of Muste et al (2005) and neglect of this may lead to an overestimate of flux (Aziz, Prasad and Bhattacharya, 1992). However, perhaps more significant is the need for effective temporal resolution in flux monitoring.…”

Section: Measurement Of Fine-sediment Fluxmentioning

confidence: 99%

The Fine‐Sediment Cascade

Naden¹

2010

Sediment Cascades

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“…The transportation and distribution of particles in turbulent flows are governed by the advection-dispersion equation (ADE) which indicates a mass balance at a certain height between downward settlement of particles and upward diffusion of particles due to turbulent fluctuation [1]. Several researchers studied the traditional ADE and proposed solutions which are analytic, numerical, empirical and semi-empirical [2,3]. Among all types of solutions, analytical solutions have several advantages.…”

Section: Introductionmentioning

confidence: 99%

Time fractional advection-dispersion model to study transportation of particles with time-memory for unsteady nonequilibrium suspension in open-channel turbulent flows

Ghosh¹,

Kundu²,

Kumar³

2021

Phys. Scr.

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In this study, the effects of time-memory on the mixing and nonequilibrium transportation of particles in an unsteady turbulent flow are investigated. The memory effect of particles is captured through a time-fractional advection-dispersion equation rather than a traditional advection-dispersion equation. The time-fractional derivative is considered in Caputo sense which includes a power-law memory kernel that captures the power-law jumps of particles. The time-fractional model is solved using the Chebyshev collocation method. To make the solution procedure more robust three different kinds of Chebyshev polynomials are considered. The time-fractional derivative is approximated using the finite difference method at small time intervals and numerical solutions are obtained in terms of Chebyshev polynomials. The model solutions are compared with existing experimental data of traditional conditions and satisfactory results are obtained. Apart from this, the effects of time-memory are analyzed for bottom concentration and transient concentration distribution of particles. The results show that for uniform initial conditions, bottom concentration increases with time as the order of fractional derivative decreases. In the case of transient concentration, the value of concentration initially decreases when $T<1$ and thereafter increases throughout the flow depth. The effects of time-memory \textcolor{green}{are} also analyzed under steady flow conditions. Results show that under steady conditions, transient concentration is more sensitive for linear, parabolic, and parabolic-constant models \textcolor{green}{of} sediment diffusivity rather than the constant model.

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Suspended sediment concentration profiles using conservation laws

Cited by 14 publications

References 4 publications

Two‐phase versus mixed‐flow perspective on suspended sediment transport in turbulent channel flows

Two‐phase versus mixed‐flow perspective on suspended sediment transport in turbulent channel flows

The Fine‐Sediment Cascade

Time fractional advection-dispersion model to study transportation of particles with time-memory for unsteady nonequilibrium suspension in open-channel turbulent flows

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