Nonuniform sediment transport in alluvial rivers

Wu, Weiming; Wang, Sam S. Y.; Jia, Yafei

doi:10.1080/00221680009498296

Cited by 309 publications

(230 citation statements)

References 19 publications

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“…The most tested approach is represented by the formulas of van Rijn [1984aRijn [ , 1984b. Because these formulas have a limited range of applicability (they were tested for uniform grain diameters up to 2 mm), the transport formula presented by Wu et al [2000b] was used in the present study. The twodimensional distribution of the bed shear stress was computed from the turbulence model.…”

Section: Numerical Modelmentioning

confidence: 99%

“…[18] The sediment formula for bed load by Wu et al [2000b] includes a correction factor to account for hiding and exposure mechanisms. These are assumed to be a function of the hiding and exposure probabilities, which are stochastically related to the size and gradation of the bed material.…”

Section: Numerical Modelmentioning

confidence: 99%

“…It was used to evaluate the dispersion terms in the depth-averaged 2-D momentum equations and suspended load transport equation as well as the bed load transport angle. The sediment transport formulas introduced by Wu et al [2000b] were implemented. By calibrating two parameters of the introduced helical flow intensity model, the experiments by Yen and Lee [1995] were used for validation.…”

Section: Introductionmentioning

confidence: 99%

“…The numerical model was modified by incorporating sediment transport formulas by Wu et al [2000b] to account for hiding and exposure effects. Significant bed changes in the river reach were successfully modeled by the modified approach.…”

Section: Introductionmentioning

confidence: 99%

“…The fully three-dimensional numerical model solved the Navier-Stokes equations using the k-epsilon turbulence closure. Nonuniform sediment transport was computed using the formulas of Wu et al (2000b), considering hidingexposure algorithms. Both bed deformation and sorting processes were calculated.…”

mentioning

confidence: 99%

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Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Fischer-Antze¹,

Olsen

Gutknecht

2008

Water Resources Research

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[1] The bed changes in a section of the river Danube were computed using a 3-D computational fluid dynamics model. A time series of discharges during the flood in 2002 was used. The results compared reasonably well with regular bed level surveys before and after the flood. The Danube River section was 6 km long and located between Vienna and the Austrian-Slovakian border. The fully three-dimensional numerical model solved the Navier-Stokes equations using the k-epsilon turbulence closure. Nonuniform sediment transport was computed using the formulas of Wu et al. (2000b), considering hidingexposure algorithms. Both bed deformation and sorting processes were calculated. A number of parameter sensitivity tests were carried out on roughness values, parameters in the sediment transport capacity formula, parameters in the hiding-exposure formulas, critical Shields number, and variations in the formulas for the effect of a sloping bed. Additionally, the sediment inflow to the section was varied together with investigations of physical parameters such as vegetation and groyne structures. The results were most sensitive to the Shields number for critical movement of the sediments. An error analysis was performed to give a quantitative assessment of the parameter sensitivity tests.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Fischer-Antze¹,

Olsen

Gutknecht

2008

Water Resources Research

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Comparison of fractional bed-material load �computation methods in sand-bed channels

Molinas

Wu²

2000

Earth Surf. Process. Landforms

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This paper presents a comparison of different fractional bed-material load computation methods in sand-bed channels. These methods include the direct computation by size fraction approach of Einstein, Laursen and Toffaleti; the bed material fraction (BMF) approach using equations of Engelund and Hansen, Ackers and White, Yang, and Karim's modified BMF method; and the transport capacity fraction (TCF) approach using the transport capacity distribution functions of Karim and Kennedy, Li, and Wu and Molinas. Over 150 sets of flume and field data in the sand size range containing a total of 1007 data points are used to evaluate and compare the accuracy of these methods. Statistical analysis and graphical comparison are utilized to demonstrate the performance and variations in different methods.Overall, the Einstein method underpredicts the transport rate for finer sizes and overpredicts for the coarser sizes, while the other methods overestimate the finer fractions and underestimate the coarser fractions. The Wu and Molinas method, which was developed to account for these deficiencies, is shown to significantly improve fractional bed-material load computations. The Karim and Kennedy method is also found to be applicable.

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Tropical Cyclone‐Driven Sediment Dynamics Over the Australian North West Shelf

et al. 2017

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Owing to their strong forcing at the air‐sea interface, tropical cyclones are a major driver of hydrodynamics and sediment dynamics of continental shelves, strongly impacting marine habitats and offshore industries. Despite the North West Shelf of Australia being one of the most frequently impacted tropical cyclone regions worldwide, there is limited knowledge of how tropical cyclones influence the sediment dynamics of this shelf region, including the significance of these episodic extreme events to the normal background conditions that occur. Using an extensive 2 year data set of the in situ sediment dynamics and 14 yearlong calibrated satellite ocean‐color data set, we demonstrate that alongshore propagating cyclones are responsible for simultaneously generating both strong wave‐induced sediment resuspension events and significant southwestward subtidal currents. Over the 2 year study period, two particular cyclones (Iggy and Narelle) dominated the sediment fluxes resulting in a residual southwestward sediment transport over the southern part of the shelf. By analyzing results from a long‐term (37 year) wind and wave hindcast, our results suggest that at least 16 tropical cyclones had a strong potential to contribute to that southwestward sediment pathway in a similar way to Iggy and Narelle.

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Nonuniform sediment transport in alluvial rivers

Cited by 309 publications

References 19 publications

Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Comparison of fractional bed-material load �computation methods in sand-bed channels

Tropical Cyclone‐Driven Sediment Dynamics Over the Australian North West Shelf

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