A 3-D Wave-Current Driven Coastal Sediment Transport Model

Wai, Onyx W. H.; Chen, Y.; Li, Y. S.

doi:10.1142/s0578563404001105

Cited by 8 publications

(6 citation statements)

References 30 publications

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“…The simulation of the bed evolution dynamics implies an appropriate representation of sediment particle resuspension and settling phenomena which are mainly related to wave refraction, shoaling, diffraction, reflection, wave breaking phenomena, to long-shore and rip currents, to the hydrodynamic field threedimensionality, hydrodynamic quantities variability and run-up and run-down phenomena in the swash zone. Coastal currents and, more generally, hydrodynamic phenomena produced by wave motion have features of three-dimensionality that are locally important [Choi and Yoon, 2008;Li et al, 2007;Ma et al, 2014;Wai et al, 2004]. The sediment transport in coastal regions is consequently the result of the above-mentioned threedimensional hydrodynamic processes, driven by hydrodynamic quantities that are time-varying into the wave period and is influenced by the net sediment transport rate from the swash zone in the cross-shore direction.…”

Section: Introductionmentioning

confidence: 99%

Modeling Bed Evolution Using Weakly Coupled Phase-Resolving Wave Model and Wave-Averaged Sediment Transport Model

Gallerano

Cannata

Gaudenzi

et al. 2016

Coastal Engineering Journal

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In this paper, we propose a model for the simulation of the bed evolution dynamics in coastal regions characterized by articulated morphologies. An integral form of the fully nonlinear Boussinesq equations in contravariant formulation, in which Christoffel symbols are absent, is proposed in order to simulate hydrodynamic fields from deep water up to just seaward of the surf zones. Breaking wave propagation in the surf zone is simulated by integrating the nonlinear shallow water equations with a high-order shock-capturing scheme. The near-bed instantaneous flow velocity and the intra-wave hydrodynamic quantities are calculated by the momentum equation integrated over the turbulent boundary layer. The bed evolution dynamics is calculated starting from the contravariant formulation of the advection-diffusion equation for the suspended sediment concentration in which the advective sediment transport terms are formulated according to a quasi-three-dimensional approach, and taking into account the contribution given by the spatial variation of the bed load transport. The model is validated against several tests by comparing numerical results with experimental data. The ability of the proposed model to represent the sediment transport phenomena in a morphologically articulated coastal region is verified by * Corresponding author. This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited. 1650011-1 F. Gallerano et al.numerically simulating the long-term bed evolution in the coastal region opposite Pescara harbor (in Italy) and comparing numerical results with the field data.

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Section: Introductionmentioning

confidence: 99%

Modeling Bed Evolution Using Weakly Coupled Phase-Resolving Wave Model and Wave-Averaged Sediment Transport Model

Gallerano

Cannata

Gaudenzi

et al. 2016

Coastal Engineering Journal

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“…These coastal area models are further subdivided into two-dimensional horizontal (2DH) models (e.g., Dissanayake et al, 2012;Ferrarin et al, 2008;Kuang et al, 2012), quasi-3D models (e.g., Drønen and Deigaard, 2007; and three-dimensional (3D) models (e.g., Lesser et al, 2004;Liang et al, 2007;Normant, 2000;Pandoe and Edge, 2004;Pietrzak et al, 2002;Pinto et al, 2012;Wai et al, 2004;Warner et al, 2008).…”

Section: Coastal Area Models: 2dh and 3d Modelsmentioning

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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“…Flux boundary conditions aim to provide some kind of information on the vertical sediment flux at the bottom boundary. Either the net sediment flux at the bottom boundary is specified directly as a boundary condition [e.g., Harris and Wiberg , 2001; Wai et al , 2004], or erosion and deposition act as source and sink in the advection‐diffusion equation and the diffusive (and advective) flux of sediment is set to zero at the bottom boundary [e.g., Lesser et al , 2000; Warner et al , 2008]. It has to be noted that whichever boundary condition approach is employed, the bed evolution equation () requires the specification of the bottom vertical fluxes (i.e., erosion and deposition), which is discussed in more detail in section 3.3.…”

Section: Mathematical Formulation Of Sediment Transport In Regional Mmentioning

confidence: 99%

“…In such cases, quasi three‐dimensional (quasi 3‐D) concepts were developed and added to 2DH models to avoid solving the full three‐dimensional hydrodynamic equations [ de Vriend and Ribberink , 1988; Briand and Kamphuis , 1993; Roelvink et al , 1994; Elfrink et al , 1996]. Models have now also recently turned to solving the full three‐dimensional equations both for river applications [ Gessler et al , 1999; Wu et al , 2000; Fang and Rodi , 2003] and for coastal environments [ Lesser et al , 2004; Wai et al , 2004; Warner et al , 2008].…”

Section: Introductionmentioning

confidence: 99%

Deterministic Coastal Morphological and Sediment Transport Modeling: A Review and Discussion

Amoudry¹,

Souza²

2011

Reviews of Geophysics

136

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[1] Modern coastal ocean modeling systems are now capable of numerically simulating a variety of coastal and estuarine problems and can thus provide useful information for managing coastal zones. Here we review state-of-the-art Eulerian implementations of bottom-up sediment transport and morphological change in coastal ocean hydrodynamic models. In order to investigate the fate of suspended sediment in coastal and estuarine waters as well as the evolution of sea or river beds, sediment dynamics need to be represented at a scale relevant to the numerical discretized solution, and significant effort is devoted to parameterize sediment processes. We discuss boundary layer hydrodynamics and the computation of the bed shear stress. We also focus on approaches used to represent near-bed processes such as bed load transport and sediment erosion and deposition. Sediment diffusivities, settling velocities, and cohesive processes such as flocculation all have an impact on suspended sediment throughout the water column. We then describe the implementation of process parameterizations in coastal hydrodynamic models, explicitly reviewing five widely used systems. The approaches implemented in these coastal models may present distinct strengths and shortcomings with regard to some important issues for coastal zones, both numerical and physical. While these detailed limitations need to be considered as part of model assessment, more general issues also hinder present state-of-the-art models. In particular, sediment transport is inherently highly empirical, which is further compounded by issues arising from turbulence closure schemes. We conclude by suggesting some possible directions toward improving sediment dynamics understanding and coastal-scale predictive ability.Citation: Amoudry, L. O., and A. J. Souza (2011), Deterministic coastal morphological and sediment transport modeling: A review and discussion, Rev. Geophys., 49, RG2002,

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A 3-D Wave-Current Driven Coastal Sediment Transport Model

Cited by 8 publications

References 30 publications

Modeling Bed Evolution Using Weakly Coupled Phase-Resolving Wave Model and Wave-Averaged Sediment Transport Model

Modeling Bed Evolution Using Weakly Coupled Phase-Resolving Wave Model and Wave-Averaged Sediment Transport Model

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

Deterministic Coastal Morphological and Sediment Transport Modeling: A Review and Discussion

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