Hello,
Is your gulf region located in the Atlantic Ocean or English Channel?
If not, the proposed test case is useless. But, you can find enclosed the test case without the big files to decrease the size of the archive (in particular, the reference files are not included, please comment VALIDATION = OUI and FICHIER DE REFERENCE = ref...)
Anyway, to have an example of the code to force tidal constituent, you can read tidal_model_t2d and bord_tide subroutines available in telemac2d directory (or in the Fortran file of the 3 examples).
Hope this helps,
Chi-Tuan