La dynamique sédimentaire au voisinage du port de pêche de Zarzis

Abstract

The sediment analysis shows that the semilogarithmic cumulative curves of the coarse particle size (> 63 microns) are S-shaped in the majority of samples. It shows that the sands are transported in an environment more or less agitated. Particle size analysis of surface sediments shows the presence of three distinct faces. These faces are made up of fine sand, medium sand and coarse sand. These sands are poorly sorted to moderately sort. There is an accumulation of fine sands upstream and just downstream of the harbor jetty. The pier plays an essential role trapping fine sediments upstream. The presence downstream of the pier fine sediments is the consequence of this sediment transport by waves during major storms. The analysis of the fine fraction of the sediments shows that there are clays and silts in varying proportions. In fact, silts have a higher percentage than that of clays. These fine sediments could be entrapped in very quiet environments or transported by turbidity current. Mineralogical analysis shows that the non-clay minerals consist of quartz, calcite, magnesium calcite, dolomite and feldspar. Quartz is the most abundant mineral. Clay minerals are composed of Illite, kaolinite and Chlorite. The most abundant mineral is Illite.Original