3D phase-resolved wave modelling with a non-hydrostatic ocean circulation model

Abstract

A phase-resolved wave model is derived from an ocean circulation model for the purpose of studying wave-current effects in nearshore zones. One challenge is to adapt the circulation model to the specificities of wave physics. This mainly concerns the consideration of nonhydrostatic effects and the parametrization of wave breaking. The non-hydrostatic pressure is calculated using the artificial compressibility method (ACM). The ACM-induced errors on wave dispersion properties are examined in detail in the context of the linear theory using idealized test cases. The possible compromise between the precision achieved on nonhydrostatic physics and the adjustable CPU cost of the ACM method is looked at in detail.The modification of the wave characteristics by the bathymetric slope and the breaking of waves are then examined from a linear slope beach laboratory experiment. Finally the model is evaluated on the issue of rip currents and their feedback on the wave field using a laboratory experiment of a beach with a bar intersected by channels.

Role of wind, mesoscale dynamics and coastal circulation in the interannual variability of South Vietnam Upwelling, South China Sea. Answers from a high resolution ocean model

“…The 3-D ocean circulation model SYMPHONIE (Marsaleix et al 2008(Marsaleix et al , 2019 is based on the Navier-Stokes primitive 110 equations solved on an Arakawa curvilinear C-grid under the hydrostatic and Boussinesq approximations. The model makes use of an energy conserving finite difference method described by Marsaleix et al (2008), a forward-backward time stepping scheme, a Jacobian pressure gradient scheme (Marsaleix et al 2009), the equation of state of Jackett et al (2006), and the K-epsilon turbulence scheme with the implementation described in Michaud et al (2012) and Costa et al (2017).…”

An Artificial Compressibility Method for 1D Simulation of Open-Channel and Pressurized-Pipe Flow

“…More than 200 papers were retrieved by database searches for 2015-2020 using the terms artificial compressibility, pseudo compressibility, and dual time stepping. These studies include analysis of the relationships between AC and fractional step methods [86,87], studies of turbulent flow [88][89][90], development of discontinuous Galerkin methods [91][92][93], parallel solution of large-scale problems [94][95][96], multi-fluid simulations [97], further advances to entropically-damped AC methods [98][99][100], implementation high-order numerical schemes [101][102][103], use of characteristic methods [104][105][106], application for non-hydrostatic effects [107,108], magneto-hydrodynamic simulations [109][110][111], solution with lattice Boltzmann methods [112], and solution by smoothed particle hydrodynamics [113,114]. Note the above are examples and should not be considered an exhaustive list of recent work.…”

Nutrient Fluxes Associated With Submarine Groundwater Discharge From Karstic Coastal Aquifers (Côte Bleue, French Mediterranean Coastline)

“…Simulations of oceanic circulation in the Gulf of Lions have been conducted using the SYMPHONIE model (Marsaleix et al, 2008(Marsaleix et al, , 2019. This model has been widely used to study the Rhône plume in situations of realistic forcing by wind and river discharge (Estournel et al, 2001;Reffray et al, 2004) and more broadly the circulation over the entire Gulf of Lions (Estournel et al, 2003;Petrenko et al, 2008).…”