A sheetflow sediment transport model for skewed-asymmetric waves combined with strong opposite currents

Dong, Le Phuong; Sato, Shinji; Liu, Haijiang

doi:10.1016/j.coastaleng.2012.08.004

Cited by 41 publications

(41 citation statements)

References 26 publications

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“…Good agreement between (1) and measurements of (quasi-)stationary sheet flow has been observed [Sumer et al, 1996;Lanckriet et al, 2014]. Equation (1) has also been used to predict the quasi-steady and maximum sheet flow layer thickness under oscillatory flow Malarkey et al, 2003;Dong et al, 2013].…”

Section: Introductionmentioning

confidence: 85%

“…Experimental studies to investigate sheet flow have been conducted primarily in oscillatory flow tunnels [Horikawa et al, 1982;Ribberink and Al-Salem, 1995;Dibajnia and Watanabe, 1998;Dohmen-Janssen et al, 2001;Ahmed and Sato, 2003;Wright, 2004a, 2004b;van der A et al, 2010;Ruessink et al, 2011;Dong et al, 2013], supplemented by wave flume studies Hanes, 2002, 2005;Chassagneux and Hurther, 2014]. A main outcome was the development of empirical formulas for the net sheet flow sediment transport aimed toward use in large-scale morphodynamic models [Drake and Calantoni, 2001;Hoefel and Elgar, 2003;Watanabe and Sato, 2004;Camenen and Larson, 2006;da Silva et al, 2006;Nielsen, 2006;Gonzalez-Rodriguez and Madsen, 2007;van der A et al, 2010.…”

Section: Introductionmentioning

confidence: 99%

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A semianalytical model for sheet flow layer thickness with application to the swash zone

Lanckriet

Puleo

2015

JGR Oceans

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A new semianalytical model for the time-dependent thickness of the sheet flow layer that includes the effects of pressure gradients, bed slope, boundary layer growth, and bore turbulence is presented. The shear stress and boundary layer growth are computed using the boundary layer integral method. The model is expressed as two coupled ordinary differential equations that are solved numerically given a prescribed time series of free-stream velocity, horizontal pressure gradient and bore turbulence, which together represent the hydrodynamic forcing. The model was validated against two data sets of sheet flow layer thickness collected in oscillatory flow tunnels and one data set collected in the swash zone of a prototype-scale laboratory experiment. In the oscillatory flow tunnel data sets, sheet flow is mostly generated by shear stress, with pressure gradients providing an important secondary forcing around flow reversal. In the swash zone, pressure gradients and shear stresses alone are not sufficient to generate the large sheet flow layer thickness observed at the initial stages of uprush. Bore turbulence is most likely the dominant generation mechanism for this intense sheet flow.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

A semianalytical model for sheet flow layer thickness with application to the swash zone

Lanckriet

Puleo

2015

JGR Oceans

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“…Myrhaug and Holmedal [49] developed analytical relations for characteristic statistical values of the sheet flow layer thickness by considering a stationary Gaussian narrow-band random process. Dong et al [23] used the optical illumination technique to measure the thickness of sheet flow layer and proposed an expression for the maximum thickness of sheet flow layer under collinear waves and currents by considering the influence of flow acceleration and wave-current interaction effect. Revil-Baudard and Chauchat [59] proposed an analytical model by using the dense granular rheology and dilatancy law coupled with a mixing length approach and found the non-dimensional relation between the sheet flow layer thickness with Shields parameter, static friction coefficient, mean sheet flow layer concentration and median particle diameter.…”

Section: Introductionmentioning

confidence: 99%

Advent of sheet flow in suction affected alluvial channels

Deshpande

Kumar

2015

Environ Fluid Mech

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The presence of suction (flow of water from channel to ground water) affects the channel hydrodynamics and increases the bed shear stress. At high bed shear stress in alluvial channels made of the non-cohesive material, sediment transport occurs as sheet flow layer of high sediment concentration. The sediment transport in the form of sheet flow has been observed in the present study when suction was applied to the non-transporting channels designed on incipient motion condition. The erosion of the channel banks contributed to the sheet flow because of the increased channel bed shear stress. An empirical relation for the thickness of sheet flow layer has been developed which includes suction as independent parameter along with others.

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“…Up to now, many models focus on sand (e.g., Dong et al, 2013;Uittenbogaard et al, 2000) and fluid mud (e.g., Hsu et al, 2009;Winterwerp and Uittenbogaard, 1997), but few on silty sediments. So far, there is still little thorough modelling and parameterization of sediment concentration distribution in high concentration layer (HCL) of silty sediments.…”

Section: Numerical Simulation For Sediment Transport Under Combined Wmentioning

confidence: 99%

“…The process-based unsteady models are based on more advanced approaches, and this study focuses on this kind of model. Up until now, there are many models focusing on sand (e.g., Dong et al, 2013;Kranenburg et al, 2013;Uittenbogaard et al, 2000) and fluid mud (e.g., Hsu et al, 2009;Winterwerp and Uittenbogaard, 1997), but few models on silty sediments.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

Zuo¹

2018

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Although all care is taken to ensure integrity and the quality of this publication and the information herein, no responsibility is assumed by the publishers, the author nor IHE Delft for any damage to the property or persons as a result of operation or use of this publication and/or the information contained herein. A pdf version of this work will be made available as Open Access via http://repository.tudelft.nl/ihe. This version is licensed under the Creative Commons To my family AbstractThe evolution and utilization of estuarine and coastal regions are greatly restricted by sediment problems. Inspired by the Caofeidian sea area in Bohai Bay, China, this study aims to better understand silty sediment transport under combined action of waves and currents, especially in the wave-current bottom boundary layer (BBL), and to improve our modelling approaches in predicting estuarine and coastal sediment transport.Field observations were carried out in northwestern Caofeidian sea area of Bohai Bay and field data were collected on several other silt-dominated coasts. Analysis shows that silt-dominated sediments are sensitive to flow dynamics: the suspended sediment concentrations (SSCs) increase rapidly under strong flow dynamics (i.e., waves or strong tidal currents which can stir up sediments), and high concentrations cause heavy sudden back siltation in navigation channels. In the following, details of silty sediment transport are studied, focusing on the BBL and high concentration layer (HCL).From laboratory experiments and theoretical analysis, an expression for sediment incipient motion is proposed for silt-sand sediment under combined wave and current conditions. The Shields number was revised by adding the cohesive force and additional static pressure, leading to an extended Shields curve.To study the HCL, a process based 1DV model was developed for flow-sediment dynamics near the bed in combined wave-current conditions. Based on the physical processes, special approaches for sediment movement were introduced, including approaches for different bed forms (rippled bed and 'flat-bed'), hindered settling, stratification effects, mobile bed effects, reference concentration and critical shear stress. The HCL was simulated and sensitivity analysis was carried out by the 1DV model on factors that impact the sediment concentration in the HCL. The results show that the HCL is affected by both flow dynamics and bed forms; the thickness of the HCL is about twice the height of the wave boundary layer; bed forms determine the shape of the concentration profile near the bottom, and flow dynamics determine the magnitude. For finer sediment, stratification effects and mobile bed effects impact the sediment concentration greatly.Finally, based on the 1DV model, the formulations of the mean sediment concentration profile of silty sediments were studied. By solving the time-averaged diffusion equation for SSC and considering the effects of bed forms, stratification and hindered settling, expressions for time-averaged SSC profile...

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A sheetflow sediment transport model for skewed-asymmetric waves combined with strong opposite currents

Cited by 41 publications

References 26 publications

A semianalytical model for sheet flow layer thickness with application to the swash zone

A semianalytical model for sheet flow layer thickness with application to the swash zone

Advent of sheet flow in suction affected alluvial channels

Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

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