Modelling wave group-scale hydrodynamics on orthogonal unstructured meshes

Journal Article (2023)
Author(s)

Johan Reyns (Deltares, TU Delft - Coastal Engineering, IHE Delft Institute for Water Education)

Robert McCall (Deltares)

Roshanka Ranasinghe (University of Twente, IHE Delft Institute for Water Education, Deltares)

Ap R. van Dongeren (IHE Delft Institute for Water Education, Deltares)

Jan Adriaan Roelvink (Deltares, TU Delft - Coastal Engineering, IHE Delft Institute for Water Education)

Research Group
Coastal Engineering
Copyright
© 2023 J.A.H. Reyns, Robert McCall, Roshanka Ranasinghe, Ap van Dongeren, D. Roelvink
DOI related publication
https://doi.org/10.1016/j.envsoft.2023.105655
More Info
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Publication Year
2023
Language
English
Copyright
© 2023 J.A.H. Reyns, Robert McCall, Roshanka Ranasinghe, Ap van Dongeren, D. Roelvink
Research Group
Coastal Engineering
Volume number
162
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Abstract

An unstructured hydrodynamic model is presented that is able to simulate 2D nearshore hydrodynamics on the wave group scale. A non-stationary wave driver with directional spreading, with physics similar to XBeach (Roelvink et al., 2009) is linked to an improved and extended version of the existing unstructured flow solver Delft3D–FM (Kernkamp et al., 2011; Martyr-Koller et al., 2017). The model equations are discretised on meshes consisting of triangular and rectangular elements. The model allows for coverage of the model domain with locally optimised resolution to accurately resolve the dominant processes, yet with a smaller total number of grid cells. The model also allows a larger explicit time step, compared to structured models with similar functionality. The model reliably reproduces measured datasets of water levels, sea/swell and low frequency wave heights in laboratory and field conditions, and is as such widely deployable in a variety of simple and complex coastal settings to study nearshore hydrodynamics.