An Equilibrium Transport Formula for Modeling Sedimentation of Dredged Channels

Kaczmarek, Leszek M.; Sawczynski, Szymon; Biegowski, Jarosław

doi:10.1142/s0578563417500152

Cited by 13 publications

(6 citation statements)

References 1 publication

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“…This was likely caused by sediment deposition (Okabe & Kato, 2018). These results are also consistent with Juez et al (2017) and Kaczmarek et al (2017). Every reach and year presented changes in banks and in the heights of the centre of the canal base.…”

Section: Resultssupporting

confidence: 93%

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Sousa

Raude

Wambua

et al. 2022

Irrigation and Drainage

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Bathymetric changes have been observed over the years in the Chókwè irrigation scheme (CIS) and little is known about their cause. This study assessed bathymetric variations that have occurred since 2001, when the scheme was last rehabilitated. The bathymetry of canal beds and banks was analysed using GPS‐Rover surveying equipment to determine cross‐section and longitudinal profiles. Water level measurements were performed using staff gauges at nine different sampling stations. Data sets for 2001, 2016 and 2019 were considered. Canal depth changes were captured, and density plots generated. Bathymetric changes of cross‐sectional and longitudinal profiles, slope trend analysis models, canal depth changes and water depth variation, were assessed. Results suggest cross‐sectional and longitudinal bathymetric profiles are affected by sediment accumulation. The depths of canal beds varied from 0.5 to 2.0 m over a span of more than 80 km. Trend analysis models indicated good accuracy for fits in all three reaches in 2001, 2016 and 2019. The forecast accuracy predictors MAPE, MAD and MSD were all found to have minimal values within the acceptable range of 1 and 3 for all the years and sectors. The water depth in the canal showed considerable variation within and across each sampling point and station, varying from 3.5 to less than 1.2 m. These findings will play a significant role in the study of water flow and sedimentation processes in the CIS.

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Section: Resultssupporting

confidence: 93%

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Sousa

Raude

Wambua

et al. 2022

Irrigation and Drainage

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“…Theoretical foundations of sediment transport modeling were formulated by Kaczmarek [33], who presented the concept of a multilayer continuous description of sediment concentration and velocity distributions. This concept was later extended by Kaczmarek and Ostrowski [34] to describe the transport of homogeneous sediments under wave-current conditions and by Kaczmarek et al [35] to describe the transport of granulometrically heterogeneous sediments under wave-current conditions, as well as by Kaczmarek et al [36,37] to describe morphological changes. The theoretical basis on the multilayer model of transport of granulometrically heterogeneous sediments under both wave and flow conditions is summarized by Kaczmarek et al [32,38,39].…”

Section: Introductionmentioning

confidence: 99%

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

Radosz

Zawisza

Biegowski

et al. 2022

Water

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The purpose of the study was to collect experimental data on the vertical structure of sediment fluxes during the wave crest and trough phase over sloped bed. The first stage of the experimental work included measurements of these fluxes using the particle image method, while the second stage, measurements of sediment transport rates and granulometric distributions of sediments collected in the traps on both sides of the sloped initial area. The experimental data were compared both with the results collected previously over flat bed as well as with a theoretical analysis based on a three-layer model of graded sediment transport. This model does not take into account the effects related to the presence of fine and very fine fractions and neglects the effects related to the bed slope, i.e., to gravitational forces and to additional pressure gradients. Hence, a modification of this model is proposed that is based on four coefficients that corrected for sediment fluxes over sloped bed. The consistency of the sediment transport calculations according to the modified model with measurements was achieved within plus/minus a factor of 2 of the measurements.

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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%

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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An Equilibrium Transport Formula for Modeling Sedimentation of Dredged Channels

Cited by 13 publications

References 1 publication

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

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

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

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