“…This model describes variable density flows with free surface, the density variations coming from differences in temperature and/or salinity. The model is presented in the companion paper (Boittin et al, 2020), in which a layer-averaged formulation is also given. The layer-averaged formulation suppresses the need for moving meshes (Decoene and Gerbeau, 2009), (Donea et al, 2004).…”