Sand Concentration in an Oscillatory Flow

Bakker, W.H.

doi:10.1061/9780872621138.069

Cited by 38 publications

(21 citation statements)

References 1 publication

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“…Similar models have been used by other researchers such as Jonsson (1963), Kajiura (1968), Horikawa and Watanabe (1968), Bakker (1974), Brevik (1981), Fredsoe et al(1985) and Rakha et al (1997). Most often these models have been used for plane bed conditions, but Rakha et al (1997) applied their model to compute the profile evolution in the surf zone with ripples along a considerable portion of the profile.…”

Section: Mathematical Modelmentioning

confidence: 99%

Wave-Related Suspended Sand Transport in the Ripple Regime

Chung¹,

Grasmeijer

Rijn³

2001

Coastal Engineering 2000

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This paper presents results of an experimental and theoretical study of wave-related suspended sand transport under irregular waves in the ripple regime. Time series analysis of experimental data to determine the mean and oscillating suspended transport components was done by using a specially developed software. The relationship between the wave-related suspended sediment transport rate and the significant wave height is established. The influence of particle diameter on the wave-related transport is also seen clearly through the analysis results. The second part of the study is related to the 1DV model, which simulates the instantaneous velocity and sand concentrations from close to the bed up to higher in the water column. The model is based on the classical diffusion approach taking both the turbulence-related and the effective wave-related diffusion into account. It shows that the time-averaged sand concentrations can be simulated reasonably well in the ripple regime using the calibrated equations. The accuracy of the suspended transport was found to be strongly dependent on the type of applied bed-boundary condition for the sand concentration (computed from a formula or taken from measured data).

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Section: Mathematical Modelmentioning

confidence: 99%

Wave-Related Suspended Sand Transport in the Ripple Regime

Chung¹,

Grasmeijer

Rijn³

2001

Coastal Engineering 2000

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“…A la base de ces outils pour la prévision, il y a une meilleure compréhension des processus et en particulier grâce à la modélisation de la couche limite de fond, vre., Journées Nationales Génie Civi/-Génie Côtier, Caen, France, 17-19 Mai 2000 le plus souvent turbulente en nature, sous un écoulement oscillatoire. Parmi les premiers modèles, Fredsoe (1984), à la suite de Bakker (1974), suppose à chaque instant un profil logarithmique de la vitesse dans la couche limite et en déduit la viscosité turbulente. Cette approche constitue la base du modèle Sediment Transport Program (STP).…”

Section: Introductionunclassified

Amélioration de la modélisation couplée houle-courant-sédiment

Guizien¹,

Silva²

2000

VIèmes Journées, Caen

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RésuméLe débit sédimentaire total prédit par un modèle de couche limite turbulente de type k-L se compare favorablement aux expériences avec des sables moyens (dso = 0.21 mm) sur fond plat mais dans le détail de la colonne d'eau, des divergences apparaissent. La concentration moyenne près du fond ("sheet flow") était sous estimée dans le modèle et la concentration instantanée dans la couche de suspension était mal décrite. La modélisation de l'entravement dans la couche de "sheet f[ow" permet de mieux décrire la concentration moyenne près du fond pour des sables fins à grossiers (dso variant de 0.13 mm à 0.32 mm). AbstractTotal sediment load predicted using a k-L turbulent boundary layer model agrees with measurements for sand with dso = 0.21 mm under sheet flow conditions but discrepancies arise wh en looking in details of the water column. The mean concentration was underestimated by the model, whereas upper in the suspension layer, the phase shift betweeil concentration and velocities time series is not reproduced by the mode!. Taking into account hindering in the sheet flow layer enables us to improve the mean concentration predictions near the bot tom for sand with dso ranging from 0.13 mm to 0.32 mm.

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“…The flow field must be known a priori, and two quantities are important: the eddy viscosity, v T , of the flow, since-£ s is usually considered to be proportional to or equal to v T ; the bed shear stress, r b , because the instantaneous bed concentration of sediment is a function of the instantaneous r b . The application of turbulence models to the wave boundary layer has been investigated by a number of researchers [2][3][4][5][6][7][8], see e.g. [7] for a recent review.…”

Section: Introductionmentioning

confidence: 99%

A note on turbulence calculations in the wave boundary layer

Justesen

1991

Journal of Hydraulic Research

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The distribution of turbulence in the wave boundary layer is investigated. Turbulent kinetic energy, eddy viscosity, and other quantities predicted by use of standard one-equation and two-equation turbulence models are compared with experimental data. It is found that the two-equation model gives better results for the eddy viscosity, which is important in connection with the modelling of suspended sediment. The improvements, however, may not be sufficient to justify the extra work involved in a practical application. RESUME La distribution de turbulence dans la couche limite de la houle a été analysée. L'énergie cinétique turbulente, la viscosité turbulente et les autres quantités calculées par les modèles classiques de turbulence à une équation et à deux équations ont été comparées avec des résultats d'essais. On a trouvé que le modèle à deux équations donne de meilleurs résultats pour la viscosité turbulente, ce qui est important pour une modélisation correcte des sédiments en suspension. Cet avantage n'est cependant pas assez important pour justifier l'utilisation dans une application pratique.

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Sand Concentration in an Oscillatory Flow

Cited by 38 publications

References 1 publication

Wave-Related Suspended Sand Transport in the Ripple Regime

Wave-Related Suspended Sand Transport in the Ripple Regime

Amélioration de la modélisation couplée houle-courant-sédiment

A note on turbulence calculations in the wave boundary layer

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