4. Numerical models
The hydrodynamic model used to estimate the current fields for the Bay of Biscay is the Regional Ocean Modeling System (ROMS).
ROMS is an evolution of the S-coordinate Rutgers University Model (SCRUM), described by Song and Haidvogel (1994). It has been expanded to include a variety of new features including: high-order advection-schemes; accurate pressure gradient algorithms; several subgrid-scale parameterizations; atmospheric, oceanic, and benthic boundary layers; biological modules; radiation boundary conditions; and data assimilation.
Presently, ROMS does not designate a single model, but a variety of versions; these have been developed, in the open literature, by different institutions.