Modeling of Sediment Transport in Steady Flow over Mobile Granular Bed

Kaczmarek, Leszek M.; Biegowski, Jarosław; Sobczak, Łukasz

doi:10.1061/(asce)hy.1943-7900.0001566

Cited by 11 publications

(12 citation statements)

References 45 publications

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“…1b) represent continuous shape. This transition zone is called the contact layer after Kaczmarek et al (2004), Kaczmarek et al (2017) and Kaczmarek et al (2019). The suspended sediment zone is divided into inner and outer flow regions.…”

Section: Description Of the Multi-layer Modelmentioning

confidence: 99%

“…The increasing residual part as the rateindependent component is transferred further to the fixed bed. The concept of shear stress variation proposed originally for steady flow (Kaczmarek et al 2019) is extended here for a wave motion. Shear stress increases from the skin stress value above the bed to the maximum value at the bed, and then, the viscous part of this stress decays in the bed.…”

Section: Description Of the Multi-layer Modelmentioning

confidence: 99%

“…Following the idea by Kaczmarek et al (2019), the three mobile-bed effect parameters are introduced:…”

Section: Basic Equations and Calculation Proceduresmentioning

confidence: 99%

“…The concept of vertical shear stress variation, recently introduced by Kaczmarek et al (2019) for steady flow is extended here for a wave motion. The proposed description of vertical shear stress variation is also verified here by comparison of the numerical calculation results of the maximum shear stress at the bed during the wave period versus the results of direct stress measurements (Rankin & Hires 2000, Jiang & Baldock 2015.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Calculations with a Multi-layer Model of Mixed Sand Transport Against Measurements in Wave Motion and Steady Flow

Kaczmarek

2021

RoczOchrSrod

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A multi-layer model is used to calculate time-dependent sediment velocity and concentration vertical profiles. This model, in which the differences in sediment transport at different distances from the bed are considered is intended both for the wave motion and steady flow. Numerical calculations were carried out for sediment transport during the wave crest and trough and total sediment transport as a sum of their absolute values. The model concept of variation in shear stress from the skin stress value above the bed to the stress value at the bed previously proposed for steady flow is extended here for the wave motion and verified by direct stress measurements. The calculations were carried out for mixed sand sediments with different grain size distributions including semi-uniform and poorly sorted grains. Comparison with the available small- and large -scale data from flumes and oscillating tunnels yields agreement typically within plus/minus a factor two of measurements.

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Section: Description Of the Multi-layer Modelmentioning

confidence: 99%

Section: Description Of the Multi-layer Modelmentioning

confidence: 99%

“…Following the idea by Kaczmarek et al (2019), the three mobile-bed effect parameters are introduced:…”

Section: Basic Equations and Calculation Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Calculations with a Multi-layer Model of Mixed Sand Transport Against Measurements in Wave Motion and Steady Flow

Kaczmarek

2021

RoczOchrSrod

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“…The determination of a law of the wall in turbulent flows requires the knowledge of the wall position, an issue that may be obvious if the bed is smooth but is instead tricky if the bed is rough (e.g., Wilcock 1996;Smart 1999) and becomes further complicated if the sediment bed is moving under the action of the flow (e.g., Dey et al 2012;Ferreira et al 2012). Some studies (e.g., Bareš et al 2016;Berzi et al 2019;Capart and Fraccarollo 2011;Kaczmarek et al 2019;Matoušek et al 2015Matoušek et al , 2019 have considered the sediment concentration and velocity profiles under intense sediment transport and have defined the motion of the sediment layer; the transport layer of the flow has been subdivided into an upper collisional sublayer and a lower dense sublayer which is above the stationary deposit. In the dense part, the velocity of the grains is significantly lower than that in the collisional part, and the maximum concentration of sediment is very similar to that in the stationary deposit, challenging the identification of the interface between the flow and bed.…”

Section: Introductionmentioning

confidence: 99%

On how defining and measuring a channel bed elevation impacts key quantities in sediment overloading with supercritical flow

et al. 2022

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The manuscript presents the results of an aggradation experiment performed in a laboratory channel with supercritical flow. The channel was fed with a stationary sediment load exceeding the transport capacity of the flow in the initial condition, thus inducing sediment aggradation and an increase of the bed slope. The experiment is part of a laboratory campaign mimicking sediment overloading in mountain rivers, a process that can determine increased hydraulic risk levels at key spots. A crucial issue in measuring sediment aggradation is the definition and determination of the bed elevation, this issue being quite relevant in experiments with a relatively large transport capacity, where a thick bed-load layer exists and hinders the possibility to determine with confidence a reference bed elevation. The determination of the bed elevation, in turn, impacts the quantification of a number of properties, including the initial sediment transport capacity of the flow, temporal scales of the aggradation process, water depth and Froude number. The manuscript presents a sensitivity analysis of the results to two extreme definitions for the bed elevation: the first one locates the bed at the upper edge of the bed-load layer, while the second one at the lower edge of the bed-load layer where the particles do not move. The presentation of the two alternatives is focused on the experimental methods they use, consistently with the intent of the special issue. Furthermore, it is demonstrated that the definition of the bed elevation also has a major impact on numerical models of the process. The experimental results have been reproduced numerically, demonstrating that the calibration parameters returning a best fit are also impacted significantly by how the bed is defined. The preferred definition for analyzing an experimental campaign is locating the bed below the bed-load layer.

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Scaling behavior of bedload transport: what if Bagnold was right?

Ancey,

Recking

2023

Earth-Science Reviews

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Modeling of Sediment Transport in Steady Flow over Mobile Granular Bed

Cited by 11 publications

References 45 publications

Numerical Calculations with a Multi-layer Model of Mixed Sand Transport Against Measurements in Wave Motion and Steady Flow

Numerical Calculations with a Multi-layer Model of Mixed Sand Transport Against Measurements in Wave Motion and Steady Flow

On how defining and measuring a channel bed elevation impacts key quantities in sediment overloading with supercritical flow

Scaling behavior of bedload transport: what if Bagnold was right?

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