Analyse harmonique des series chronologiques des niveaux d'eau et des courants au niveau de Ras Taguermess et a El Kantara dans le golfe de Gabes

Abstract

Within the framework of a national program concerning the study of the circulation of waters in the Tunisian coast we installed currentmeter and holographs tide graph in the gulf of Gabès in particular east of Djerba, in front of Ras-Taguermess and at the level of El Kantara. The harmonious analysis of time series of water level at the level of Ras Taguermess and El-Kantara shows the dominance of the constituents of the semi-diurnal tide with ascendancy of the semi-diurnal constituent ( M2) of period 12h25 mn The analysis in main constituent where in empirical orthogonal function (EOF) of the currents of the tide shows that at the level of El-Kantara their speed is 45 cm s-1 and the main direction is 29 ° with regard to the East; which means that is of East-north-east direction. While at the level of Ras Taguermess the speed of the tidal currents of the tide is of the order of 5 cm s-1 and the direction is North-south.