Hello,
The tidal forcing applied for the "estu_gir" test case is really specific for this case and can't be easily transposed for another location.
So as Riadh suggests, it should be better than you start from the test case "tide" where all the tidal options are illustrated, as described in the documents "Méthodologie pour la simulation de la marée avec la version 6.2 de TELEMAC-2D et TELEMAC-3D" and Telemac2D user manual. Then you can adapt it for your own configuration.
Once your tidal forcing will be set up, then you'll be able to introduce oil spill modelling features.
Regards,
Laurent