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: 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).


Recent Publication: Variability of the Red River Plume in the Gulf of Tonkin as Revealed by Numerical Modeling and Clustering Analysis

Vietnamese and French researchers from LEGOS, LOG and VAST investigated the daily to interannual variability of the Red River plume in the Gulf of Tonkin using 6-year (2011-2016) high-resolution numerical simulations. Their results show that the temporal evolution of the plume surface coverage is correlated with runoff (with a lag), but that runoff alone cannot […]


Recent publication : Influence of winds, geostrophy and typhoons on the seasonal variability of the circulation in the Gulf of Tonkin: A high-resolution 3D regional modeling study

Violaine Piton, Marine Herrmann, Patrick Marsaleix, Thomas Duhaut, Trin Bich Ngoc, Manh Cuong Tran, Kipp Shearman, Sylvain Ouillon; Regional Studies in Marine Science 45(6):101849 ; DOI:10.1016/j.rsma.2021.101849 The present study explores the seasonal variability of the circulation in the Gulf of Tonkin (GoT) and associated water fluxes, and identifies the driving physical processes of this circulation. […]


Recent publication : Oxygen budget of the north-western Mediterranean deep- convection region.

Caroline Ulses, Claude Estournel, Marine Fourrier, Laurent Coppola, Faycal Kessouri, Dominique Lefevre, Patrick Marsaleix; 2021 Biogeosciences 18(3):937-960 DOI:10.5194/bg-18-937-2021 The north-western Mediterranean deep convection plays a crucial role in the general circulation and biogeochemical cycles of the Mediterranean Sea. The DEWEX (DEnse Water EXperiment) project aimed to better understand this role through an intensive observation platform […]