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Baia da Ilha Grande is a bay located south Rio de Janeiro city, Brazil. It is a very important water body in regard to economic and ecological purposes, since it has a major commercial harbor, an oil terminal, many industries and two nuclear power plants. It is also one of the most important tourist resorts of Rio. An applied research study was made by the Marine and Atmospheric Processes Modeling Laboratory (LAMMA) of IJniversidade Federal do Rio de Janeiro to the Brazilian state oil company Petrobras in order to evaluate the hydrodynamic circulation in the bay and fate of oil spills that could take place in the Petrobras oil terminal, It was used the 3-D barc~clinicoceanic numerical model Princeton Ocean Model (POM) to simulate the current field using both tidal and wind forcing, The oil spill model Nicoil developed by LAMMA that considers the most important weathering processes was implemented in this region. Methods and results are presented,

The Santos Basin region is located in the southeast part of Brazilian offshore region and contains the most important presalt oil reservoirs. The oceanographic knowledge of this region is very important for the future challenges related with oil exploration and production. The Ocean Observing System for Santos Basin also known as Blue Project started in August 2012 and its main goal is the development of a pioneer ocean observing system for Santos Basin region (Brazil) based on ocean modeling applications and real time systematic ocean data collection [1]. The data collection program makes use of satellite remote sensing and in situ sensors such as surface drifters, floaters and gliders. The proposed methodology is based in three main research work branches: ocean and atmosphere modeling, real time ocean data collection and disclosure of all the generated information. In this work it will be presented the description of the applied methodology and the preliminary results achieved by the Project.

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