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L’objectif de cette etude est de verifier et d’expliquer la dynamique dans le littoral du golfe de Gabes (cote Est de Tunisie) par des observations in situ. Nous avons effectue differentes mesures de hauteur d’eau et de courant en quelques points significatifs de cette region qui, avec l’Adriatique (dans une moindre mesure), beneficient de la plus grande amplitude de maree en mer Mediterranee. Cette etude presente les premiers resultats des analyses des series temporelles. Les instruments utilises sont des ADCP (Acoustic Doppler Current Profiler) pour le courant et des maregraphes submersibles immerges pour la hauteur d’eau. La longueur moyenne de nos series temporelles est 40 jours et sont reparties de 2007 a 2008. Les resultats preliminaires sont concluants : bien que les composantes harmoniques aient ete conformes a celles deja etablies par differents auteurs, les valeurs absolues des hauteurs d’eau ainsi que les phases presentent des ecarts significatifs au moins dans deux zones. En outre, les hauteurs ont montre l’existence d’une boucle du courant general de la Mediterranee qui penetre dans le golfe de Gabes. Translated version: Hydrodynamics of the gulf of Gabes deducted from the observations of currents and water levels The objective of this study is to verify and to explain the dynamics along the coast of the gulf of Gabes (East Coast of Tunisia) by in situ observations. We made various measurements of height of water and current in some significant points of this region which, with the Adriatic (in a lesser measure), benefit from the biggest amplitude of tide in the Mediterranean Sea. This study presents the first results of the analysis of the temporal series. The instruments used are ADCP (Acoustic Doppler Current Profiler) for the current and submersible tide loggers immersed for the height of water. The average lengths of our temporal series are 40 days and are distributed from 2007 till 2008.The preliminary results are decisive: although the harmonic components were in accordance with those already established by various authors, the absolute values of the heights of water as well as the phases presenting significant gas at least in two zones. Besides, the heights showed the existence of a loop of the current of the Mediterranean Sea which penetrates into the gulf of Gabes. Keywords: Coastal engineering; Tide; Currents; Maritime hydraulics; Harmonic components; General circulation; Gulf of Gabes; Tunisia.

Hydrodynamique du golfe de Gabès déduite à partir des observations de courants et de niveaux