Formation of the density currents in the zone of confluence of two rivers

Lyubimova, Tatyana; Lepikhin, Anatoly; Konovalov, V. V.; Parshakova, Yanina; Tiunov, A.

doi:10.1016/j.jhydrol.2013.10.041

Cited by 91 publications

(60 citation statements)

References 14 publications

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Section: Introductionmentioning

confidence: 99%

“…The main features of the flow hydrodynamics downstream of the confluence apex are mainly controlled by the planform geometry, momentum or velocity ratio (VR) of the two incoming streams, and bed morphology (Best, 1988;Best & Rhoads, 2008;Guillén-Ludeña et al, 2015;Leite Ribeiro et al, 2012;Mosley, 1976;Rhoads & Kenworthy, 1995;. Additionally, stratification effects due to differences in temperature, salinity, and/or suspended sediment load of the two incoming streams can also significantly affect flow hydrodynamics and mixing downstream of the confluence apex (Laraque et al, 2009;Lyubimova et al, 2014;Prats et al, 2010). case of concordant bed confluences, meaning confluences with comparable flow depths in the incoming channels, the instabilities developing inside the MI lead to the formation of vertically oriented vortices, which play an important role in the mass and momentum exchange between the two streams (Constantinescu et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

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Stratification Effects on Flow Hydrodynamics and Mixing at a Confluence With a Highly Discordant Bed and a Relatively Low Velocity Ratio

Cheng

Constantinescu

2018

Water Resources Research

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The effects of temperature induced stratification on flow hydrodynamics, thermal mixing, and the capacity of the flow to entrain sediment at a medium‐size stream confluence with a highly discordant bed are investigated. To isolate the effects due to differences in the temperature/density of the incoming streams, two simulations were conducted with identical flow conditions (mean velocity ratio = 0.41 and temperature difference between the two streams ΔT = 4.7°C). In the first case the Richardson number was Ri = 0 (no coupling between the temperature and the momentum equations via the Boussinesq approximation), while in the second simulation Ri = 0.67. Even in the Ri = 0 case the structure of the mixing interface (MI) was different from the one expected for concordant bed confluences with a similar confluence angle and velocity ratio. The MI contained only corotating eddies shed in the shear layer forming on the fast‐speed side of the confluence apex. In the Ri = 0.67 case no wake region was present but a large recirculation eddy formed not far from the confluence apex. In both cases, the flow near the upstream part of the MI was found to be highly 3‐D and to allow the passage of particles from one side of the confluence to the other. While in the Ri = 0 case mixing was driven by the MI eddies, in the Ri = 0.67 case mixing was controlled by large near‐bed intrusions of heavier fluid from the tributary containing colder water and also by the fluid advected in and out of the recirculation eddy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stratification Effects on Flow Hydrodynamics and Mixing at a Confluence With a Highly Discordant Bed and a Relatively Low Velocity Ratio

Cheng

Constantinescu

2018

Water Resources Research

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“…As an example of the latter, the confluence of the rivers Chusovaya and Sylva near the Ural Mountains, for which the detailed measurements on water properties and a persistent stratified state are available [14], can be mentioned. Here ∆ρ/ρ ∼ 3 · 10 −4 and during the winter period, when two rivers are covered by ice sheet, a stratified state with a two-layer flow is observed downstream from the confluence site and even upstream from it; the waters of the River Chusovaya overlay the water of the River Sylva.…”

Section: Mathematical Description Of Low-viscosity Multiphase Flowsmentioning

confidence: 99%

On Existence of Passage to the Limit of Inviscid Fluid

Goldobin¹

2016

Вестник ПГУ. Физика

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Abstract. In the dynamics of viscous fluid, the case of vanishing kinematic viscosity is actually equivalent to the Reynolds number tending to infinity. Hence, in the limit of vanishing viscosity the fluid flow is essentially turbulent. On the other hand, the Euler equation, which is conventionally adopted for description of flow of inviscid fluid, does not possess proper turbulent behaviour. This raises the question of the existence of the passage to the limit of inviscid fluid for real low-viscosity fluids. To address this question, one should employ the theory of turbulent boundary layer near an inflexible boundary (e.g., rigid wall). On the basis of this theory, one can see how the solutions to the Euler equation become relevant for the description of flow of low-viscosity fluids, and obtain the small parameter quantifying accuracy of this description for real fluids.

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“…Gamboa et al 17 proposed a new classification for submarine confluences based on a combined analysis of channel geometry and high-quality 3D seismic data. Lyubimova et al 18 studied the peculiarities of the formation of density currents in the zone of confluence of two rivers with strongly different hydrochemical regimes. Li et al 19 studied sediment deposition characteristics at river confluence in reservoir area.…”

Section: Introductionmentioning

confidence: 99%

Sediment–flow interactions at channel confluences: A flume study

Liu¹,

Bingda²,

Lu³

2015

Advances in Mechanical Engineering

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Sediment transport and bed morphology at channel confluences with different confluence angles and discharge ratios are analyzed through a series of flume experiments. Bed topography and sediment transport rate are measured and results are compared among different conditions. Sediment transport is intermittent and pulsating as the tributary flow mixes with the mainstream, and the sediment transport rate goes up with the increase in discharge ratio and confluence angle. With no sediment supplied from upstream of the flume, a central scour hole will form along the shear plane and develop toward the right bank, and the depth of the central scour hole increases as the confluence angle and discharge ratio increase. With heavy upstream sediment supplement, deposition will happen in the separation zone and upstream of the confluence area because of the tributary. And the deposition height is related to the discharge ratio and confluence angle. Results indicate the significant impact of confluence geometry, sediment, and flow factors on fluvial processes.

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Formation of the density currents in the zone of confluence of two rivers

Cited by 91 publications

References 14 publications

Stratification Effects on Flow Hydrodynamics and Mixing at a Confluence With a Highly Discordant Bed and a Relatively Low Velocity Ratio

Stratification Effects on Flow Hydrodynamics and Mixing at a Confluence With a Highly Discordant Bed and a Relatively Low Velocity Ratio

On Existence of Passage to the Limit of Inviscid Fluid

Sediment–flow interactions at channel confluences: A flume study

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