Coastal ocean modelling

SIROCCO develops and makes available a complete system for coastal ocean modelling: ocean models, assimilation tools, pre- and post-processing tools, global and regional atlases, 3D simulations, specified configurations.

The modeling of coastal and shelf seas concerns a wide variety of dynamic processes, which are influenced by the ocean, continent and atmosphere, and strongly impacted by bathymetry structures (continental shelf, slope, canyons). The scales to be taken into account, both in physics and in forcings, range from a hundred meters to several hundred kilometers, from a few minutes to the inter-annual scale, and the determining interaction of these scales between them (under the effect of strongly non-linear dynamics) is one of the distinctive characteristics of the coastal ocean. This modeling must not only realistically reproduce the dynamics of the coastal ocean, but also be able to interface with the modeling of systems for which the coastal ocean constitutes the ambient environment (biology and marine geochemistry, sediment transport) or with which the coastal ocean will interact with its interfaces (atmosphere, waves, coastline, offshore). Consequently, the coastal-compatible hydrodynamic models can not allow some simplifying assumptions common in so-called offshore models (rigid roof, z-coordinate, hydrostatic hypothesis), and constitute numerical objects of greater complexity. This complexity will continue to increase with the increase in the resolution of the models and the need to couple the different environment mentioned above.

The mission of SIROCCO (Simulations Réalistes de l’OCéan COtier) is to propose numerical tools and products that resolve the issues of coastal seas. More specifically, the SIROCCO service provides the community with several codes and tools developed within the POC (Pôle Océan et Couplage), by researchers and engineers of LEGOS and LA: ocean models (T-UGOm, SYMPHONIE), data assimilation tools (S -DAP, SpEnOI), grid generation and visualization tools (Xscan, POCVIP), as well as pre-processing and analysis tools (ArM, Tidal ToolBox COMODO) and a generic coupling platform with biogeochemical and transport modules sedimentary, compatible with the products of operational oceanography (BLOOM). Several products from these numerical tools are also developed and made available, including fields derived from 3D simulations on regions of interest (for example: simulations of the dispersion of radioactive elements during the Fukushima nuclear accident on demand of IAEA, the FES tide atlases that are used in the operational processing of satellite altimetry missions data).

training course

SIROCCO User’s Meeting and Training 2019

The next User’s meeting and Training course will be held at the Observatoire Midi-Pyrénées, Toulouse, from the 2 to 4 July 2019. Training workshops will be dedicated to: the construction of new regional configurations, visualization tools of model outputs, the new SYMPHONIE version (modelling of the Gulf of Tonkin in the South China Sea) analyses […]


Dynamics of the North Balearic Front

Dynamics of the North Balearic Front during an autumn tramontane and mistral storm: air–sea coupling processes and stratification budget diagnostic  The North Balearic Front forms the southern branch of the cyclonic gyre in the northwestern Mediterranean Sea. Its dynamics exhibit significant seasonal variability. During autumn, the front spreads northward during the calm wind periods and […]


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

SIROCCO developers derived a phase-resolved wave model from an ocean circulation model SYMPHONIE 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 non-hydrostatic effects and the parametrization of wave breaking. The non-hydrostatic pressure is […]