Sediment Transport in Oscillatory Flow Over Flat Beds

Ahilan, R.V.; Sleath, J. F. A.

doi:10.1061/(asce)0733-9429(1987)113:3(308)

Cited by 57 publications

(20 citation statements)

References 21 publications

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“…An underestimation for the Ahilan and Sleath (1987) data set and an overestimation for the Sawamoto and Yamashita (1986) data set is observed. One explanation could be that large uncertainties are induced by this kind of iterative formula (Bayram et al 2003;Camenen et al 2006).…”

Section: Comparison With Experimental Datamentioning

confidence: 89%

“…Using the Nikuradse skin roughness shows better agreement for the Sawamoto and Yamashita (1986) data set, but worse agreement for the Ahilan and Sleath (1987) data set ( Figure 27(b)). Finally, it may be noted that Equation 90 slightly underestimates the sediment transport rate for the Kalkanis (1964) data set and overestimates the rate for the Abou-Seida (1965) and the Sleath (1978) data sets.…”

Section: Comparison With Experimental Datamentioning

confidence: 99%

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A Unified Sediment Transport Formulation for Coastal Inlet Application

Camenen¹,

Larson²

2007

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Abstract:The Coastal Inlets Research Program (CIRP) is developing predictive numerical models for simulating the waves, currents, sediment transport, and morphology change at and around coastal inlets. Water motion at a coastal inlet is a combination of quasi-steady currents such as river flow, tidal current, wind-generated current, and seiching, and of oscillatory flows generated by surface waves. Waves can also create quasisteady currents, and the waves can be breaking or non-breaking, greatly changing potential for sediment transport. These flows act in arbitrary combinations with different magnitudes and directions to mobilize and transport sediment. Reliable prediction of morphology change requires accurate predictive formulas for sediment transport rates that smoothly match in the various regimes of water motion. This report describes results of a research effort conducted to develop unified sediment transport rate predictive formulas for application in the coastal inlet environment. The formulas were calibrated with a wide range of available measurements compiled from the laboratory and field and then implemented in the CIRP's Coastal Modeling System. Emphasis of the study was on reliable predictions over a wide range of input conditions. All relevant physical processes were incorporated to obtain greatest generality, including: (1) bed load and suspended load, (2) waves and currents, (3) breaking and non-breaking waves, (4) bottom slope, (5) initiation of motion, (6) asymmetric wave velocity, and (7) arbitrary angle between waves and current. A large database on sediment transport measurements made in the laboratory and the field was compiled to test different aspects of the formulation over the widest possible range of conditions. Other phenomena or mechanisms may also be of importance, such as the phase lag between water and sediment motion or the influence of bed forms. Modifications to the general formulation are derived to take these phenomena into account. The performance of the new transport formulation was compared to several popular existing predictive formulas, and the new formulation yielded the overall best predictions among the formulas investigated. Results of this report are thus considered to represent a significant and operational step toward a unified formulation for sediment transport at coastal inlets and the nearshore where transport of non-cohesive sediment is common.

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Section: Comparison With Experimental Datamentioning

confidence: 89%

Section: Comparison With Experimental Datamentioning

confidence: 99%

A Unified Sediment Transport Formulation for Coastal Inlet Application

Camenen¹,

Larson²

2007

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“…where, α is the volumetric concentration; u is the velocity; p is the pressure; x is the Cartesian coordinate; t is the time; the subscript f stands for the fluid phase and s stands for the sediment phase; the indices i and j both represent the horizontal and the vertical components and obey the summation convention; ρ is the density; g is the body force; δ α is the Schmidt number and we assume δ α = 1.0 in the present study; ν f = ν f0 + ν ft and ν s = ν s0 + ν st are the viscosities of the fluid and the sediment phases, respectively; ν ft and ν st are the turbulent viscosities of the fluid and the sediment phases resulted from turbulence modeling; ν f0 is the molecular viscosity of the fluid; ν s0 is the viscosity representing the inter-granular stress which can be related to ν f0 according to Ahilan and Sleath (1987):…”

Section: Governing Equationsmentioning

confidence: 90%

“…The University of Tokyo group continued for quite a long time to investigate the various properties of the sheet flows (Dibajnia and Watanabe, 1992;1998;Ahmed and Sato, 2003;Watanabe and Sato, 2004). Important earlier contributions were also made by the research group at University of Cambridge (Ahilan and Sleath, 1987;Dick and Sleath, 1992;Zala-Flores and Sleath, 1998). A little later, very detailed data were published by the researchers from Delft Hydraulics or those having the opportunity to use the large oscillatory water tunnel (LOWT) at WL|Delft Hydraulics (Ribberink and Al-Salem, 1995;McLean et al, 2001;Dohmen-Janssen et al, 2001;DohmenJanssen and Hanes, 2002;Hassan and Ribberink, 2005).…”

Section: Introductionmentioning

confidence: 99%

A two-phase approach to wave-induced sediment transport under sheet flow conditions

Chen

Niu

et al. 2011

Coastal Engineering

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A numerical model for the general description of the sediment transport under oscillatory sheet flow conditions is developed based on a two-fluid representation of the two-phase turbulent flows. The governing equations of the model are the Reynolds averaged continuity equations and equations of motion for both the fluid and the sediment phases. The two phases are coupled by the interphase forces including the resistance force, the inertia force, and the lift force. Turbulence closure of the fluid phase is based on a slightly modified k-ε model while an algebraic particle-turbulence model is applied to the sediment phase. The numerical method is based on the modified SIMPLE scheme and an improved time stepping technique. The model is validated by the published data for the symmetrical oscillatory sheet flows generated in an oscillatory flow tunnel at the University of Tokyo and for both the symmetrical and the asymmetrical oscillatory sheet flows generated in an oscillatory flow tunnel at University of Aberdeen. The numerical results on the temporal and spacial variation of the sediment concentration, the horizontal velocities of the two phases, the horizontal and vertical fluxes of the sediment phase, as well as the thickness of the sheet flow layer all show satisfactory agreement with the laboratory data. The model is also shown to predict the net sediment transport rate with a reasonably good accuracy.

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“…m ft and m st are determined by turbulence modeling of the fluid phase and the sediment phase, respectively. The viscosity related to the inter-granular stress may be evaluated based on Ahilan and Sleath (1987) formula:…”

Section: Governing Equationsmentioning

confidence: 99%

A general two-phase turbulent flow model applied to the study of sediment transport in open channels

Chen

Niu

et al. 2011

International Journal of Multiphase Flow

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a b s t r a c tA numerical model for the general description of the sediment-laden flow is developed based on an Euler-Euler approach of the two-phase turbulent flow theory. The basic equations of the model are the Reynolds averaged equations of motion for both the fluid and the sediment phase in addition to the Reynolds averaged continuity equations for the mixture and for the sediment phase. The fluid phase and the sediment phase are coupled through their interaction forces including resistance force, inertia force, and lift force. Turbulence closure of the fluid phase is based on the conventional k-e model while an algebraic particle turbulence model is applied to the sediment phase. The numerical method is based on the modified SIMPLE scheme. The model is applied to the computation of saturated sediment-laden flows and also the non-equilibrium transport of sediment by unidirectional flows under simple erosion and simple deposition conditions. The numerical results are well verified by the available experimental data. The vertical velocity of the sediment phase is also shown to be in very good agreement with the fall velocity of the sediment particles, which strongly support the assumption of Rouse's diffusion theory for suspended sediment under steady state.

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Sediment Transport in Oscillatory Flow Over Flat Beds

Abstract: The initiation of oscillatory ripple marks and the development of plane-bed at high shear stresses under waves,

Cited by 57 publications

References 21 publications

A Unified Sediment Transport Formulation for Coastal Inlet Application

A Unified Sediment Transport Formulation for Coastal Inlet Application

A two-phase approach to wave-induced sediment transport under sheet flow conditions

A general two-phase turbulent flow model applied to the study of sediment transport in open channels

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