Simulating morphodynamics with unstructured grids: Description and validation of a modeling system for coastal applications

Bertin, Xavier; Oliveira, Anabela; Fortunato, A. B.

doi:10.1016/j.ocemod.2008.11.001

Cited by 53 publications

(44 citation statements)

References 43 publications

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“…is approach allows high resolution of areas of interest and lower resolution over areas where bathymetry and/or processes are largely spatially invariant. In virtually all coastal and estuarine applications, the use of exible mesh models provides the best model grid solution (e.g., [32]). …”

Section: Model Grid Setupmentioning

confidence: 99%

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Guidance on Setup, Calibration, and Validation of Hydrodynamic, Wave, and Sediment Models for Shelf Seas and Estuaries

Williams

Esteves

2017

Advances in Civil Engineering

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e paper is motivated by a present lack of clear model performance guidelines for shelf sea and estuarine modellers seeking to demonstrate to clients and end users that a model is t for purpose. It addresses the common problems associated with data availability, errors, and uncertainty and examines the model build process, including calibration and validation. It also looks at common assumptions, data input requirements, and statistical analyses that can be applied to assess the performance of models of estuaries and shelf seas. Speci cally, it takes account of inherent modelling uncertainties and de nes metrics of performance based on practical experience. It is intended as a reference point both for numerical modellers and for specialists tasked with interpreting the accuracy and validity of results from hydrodynamic, wave, and sediment models.

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Section: Model Grid Setupmentioning

confidence: 99%

“…As an alternative to traps, bed load is sometimes estimated using uorescent tracers (e.g., [32]) and less frequently using magnetic tracers (e.g., [75]). …”

Section: Measuring Bed Load and Bedformsmentioning

confidence: 99%

Guidance on Setup, Calibration, and Validation of Hydrodynamic, Wave, and Sediment Models for Shelf Seas and Estuaries

Williams

Esteves

2017

Advances in Civil Engineering

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“…As a conse-5 quence, coastal management such as sediment dredging or erosion control plans becomes increasingly challenging. To better address these problems, morphodynamic modelling systems appeared as attractive tools and have experienced significant improvement during the last decades (De Vriend, 1987;De Vriend et al, 1993;Cayocca, 2001;Fortunato and Oliveira, 2004;Bertin et al, 2009;10 Zhang et al, 2013). However, a common problem of these models is the development of numerical oscillations, due to both the decoupled way of solving the hydrodynamic and the sediment continuity (or Exner) equations, and the inherently unstable nature of the non-linear coupling between the sediment transport module and the bed evolution module (Fortunato and Oliveira, 2007;Long et al, 15 2008).…”

Section: Introductionmentioning

confidence: 99%

“…This method is implemented into the SED2D sediment transport and bed evolution module of Dodet (2013), which was adapted from the sediment transport and bed evolution module SAND2D Oliveira, 2004, 2007), part of the 2DH morphodynamic mod-65 elling system MORSYS2D (Bertin et al, 2009) and the 3D morphodynamic modelling system MORSELFE (Pinto et al, 2012). As in the SAND2D module, the original method for solving the Exner equation in SED2D uses nodecentered control volumes with sediment flux considered as constant inside each element.…”

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confidence: 99%

A numerical scheme for coastal morphodynamic modelling on unstructured grids

2016

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Over the last decade, modelling systems based on unstructured grids have been appearing increasingly attractive to investigate the dynamics of coastal zones.However, the resolution of the sediment continuity equation to simulate bed evolution is a complex problem which often leads to the development of numerical oscillations. To overcome this problem, addition of artificial diffusion or bathymetric filters are commonly employed methods, although these techniques can potentially over-smooth the bathymetry. This study aims to present a numerical scheme based on the Weighted Essentially Non-Oscillatory (WENO) formalism to solve the bed continuity equation on unstructured grids in a finite volume formulation. The new solution is compared against a classical method, which combines a basic node-centered finite volume method with artificial diffusion, for three idealized test cases. This comparison reveals that a higher accuracy is obtained with our new method while the addition of diffusion appears inappropriate mainly due to the arbitrary choice of the diffusion coefficient. Moreover, the increased computation time associated with the WENO-based method to solve the bed continuity equation is negligible when considering a fully-coupled simulation with tides and waves. Finally, the application of the new method to the pluri-monthly evolution of an idealized inlet subjected to tides and waves shows the development of realistic bed features (e.g. secondary flood channels, ebb-delta sandbars, or oblique sandbars at the adjacent beaches), that are smoothed or nonexistent when using additional diffusion.

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“…The conclusions confirmed that tidal propagation depends strongly on the bathymetric configuration. The MORSYS2D model is composed by the hydrodynamic models ADCIRC or ELCIRC, the wave model SWAN and the sediment transport and bottom update model SAND2D Oliveira, 2003, 2007;Bertin et al, 2009b). The performance of MORSYS2D was assessed in the morphodynamic simulation forced both by current and waves of the Óbidos lagoon and is described in Oliveira et al (2004).…”

Section: Introductionmentioning

confidence: 99%