An Experimental Study on Progressive and Reverse Fluxes of Sediments with Fine Fractions in the Wave Motion over Sloped Bed

Radosz, Iwona; Zawisza, Jerzy; Biegowski, Jarosław; Paprota, Maciej; Majewski, Dawid; Kaczmarek, Leszek M.

doi:10.3390/w15010125

Cited by 6 publications

(1 citation statement)

References 38 publications

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“…Recently, Radosz et al [21,22] have collected measurements on the vertical structure of sediment fluxes during the wave crest and trough phase over the sloped bed. The experimental work included measurements using the particle image method and measurements of sediment transport and granulometric distributions of sediments collected in the traps on both sides of the sloped initial area.…”

Section: Review Of Literaturementioning

confidence: 99%

Modelling of Granular Sediment Transport in Steady Flow Over a Mobile Sloped Bed

Biegowski,

Pietrzak,

Radosz

et al. 2024

Preprint

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This paper introduces a three-layer system, proposing a comprehensive model of granular mixture transport over a mobile sloped bed in a steady flow. This system, consisting of the bottom, contact and upper zones, provides complete, continuous sediment velocity and concentration vertical profiles. The model considers gravity’s effect on sediment transport in the bottom (dense) layer, a crucial factor often overlooked in previous studies. The induced movement in the mobile sublayer of the dense layer causes an increase in velocity at the upper boundary of this layer, significantly affecting the vertical distributions of velocity and concentration above this layer. We described the interactions between fractions and an intensive sediment mixing and sorting process in the contact layer. The proposed shear variation, with an increase in its maximum value at the bed, adds to the novelty of our approach. The data sets used for the model’s validation cover various conditions, including slopes, grain diameters, densities and grain mobility conditions, from incipient motion to a fully mobilised bed. This extensive validation process instils confidence in the theoretical description and its applicability to real-world scenarios.

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Section: Review Of Literaturementioning

confidence: 99%

Modelling of Granular Sediment Transport in Steady Flow Over a Mobile Sloped Bed

Biegowski,

Pietrzak,

Radosz

et al. 2024

Preprint

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Sand Transport with Cohesive Admixtures…—Laboratory Tests and Modeling

Zawisza

Radosz

Biegowski

et al. 2023

Water

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The paper presents results of experimental and theoretical studies on transport of water-sand mixtures in steady flow with small amounts of cohesive fractions. The experiments were carried out for sand alone and with cohesive admixtures in the form of clay in the amount of 5, 10, 15 and 20% by weight. The amount of sand fractions retained in the trap and along the control area was measured. The experimental results were compared with the calculation results for transport rate of sand fractions. An intended model of the vertical structure of both sand velocity and concentration as well as vertical mixing and sorting is proposed here in order to determine the influence of cohesive admixtures on the transport of sand fractions. Hence the reduction of sand fractions transport due to cohesion forces is included. The agreement of sand transport calculations according to the extended model with measured results and experimental data from literature was achieved within plus/minus a factor of 2.

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Transport of Sediment Mixtures in Steady Flow with an Extra Contribution of Their Finest Fractions: Laboratory Tests and Modeling

Zawisza

Radosz

Biegowski

et al. 2023

Water

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This paper presents the results of experimental studies on the transport of water-sandy mixtures with the content of very fine non-cohesive fractions in steady flow. The flow and shear velocity measurements as well as the measurements of sediment amount in the trap and control area were conducted. A theoretical model of the vertical structure of both velocity and concentration of sediment non-cohesive fractions as well as vertical mixing and sorting is presented here for transport calculations. The interaction effects between fractions are included, especially the influence of fine fractions in the mixture on transport of coarser fractions. The model provides an agreement between measurements and calculations of transport rate and grain size distributions of poorly sorted mixtures within plus/minus a coefficient of two. Further, the present model is used for calculating the limited contribution of very fine fractions in sediment due to deficit of those fractions in the bed. Again, the compliance of the calculations of sediment transport according to measurements is achieved. The satisfactory agreement between the calculations of grain size distributions and measurements is also found.

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An Experimental Study on Progressive and Reverse Fluxes of Sediments with Fine Fractions in the Wave Motion over Sloped Bed

Cited by 6 publications

References 38 publications

Modelling of Granular Sediment Transport in Steady Flow Over a Mobile Sloped Bed

Modelling of Granular Sediment Transport in Steady Flow Over a Mobile Sloped Bed

Sand Transport with Cohesive Admixtures…—Laboratory Tests and Modeling

Transport of Sediment Mixtures in Steady Flow with an Extra Contribution of Their Finest Fractions: Laboratory Tests and Modeling

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