In the framework of the Diderot Mathematical Forum (DMF) of the European Mathematical Society (EMS), December 19-20, 1997, a Videoconference was held linking three teams of specialists in Amsterdam, Madrid and Venice respectively.

A: Oceanic pollution control.- Mathematical modelling and optimal control methods in waste water discharges.- On the approximate controllability of Stackelberg-Nash strategies.- 3D Simulation in the lower troposphere: wind field adjustment to observational data and dispersion of air pollutants from combustion of sulfur-containing fuel.- B: Numerical methods in oceanic circulation.- Eulerian versus semi-Lagrangian schemes in some ocean circulation problems: a preliminary study.- Numerical simulation in Oceanography. Applications to the Alboran Sea and the Strait of Gibraltar.- Simulation of reactive transport in groundwater. A comparison of two calculation methods.

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