Modelling wave group-scale hydrodynamics on orthogonal unstructured meshes

Johan Reyns*, Robert Mccall, Roshanka Ranasinghe, Ap Van dongeren, Dano Roelvink

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
19 Downloads (Pure)

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.
Original languageEnglish
Article number105655
Number of pages24
JournalEnvironmental modelling & software
Volume162
DOIs
Publication statusPublished - 1 Apr 2023

Keywords

  • Numerical modelling
  • Nearshore circulation
  • Infragravity waves
  • Unstructured meshes

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