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. The sedimentary contributions of the Medjerda to the coastal zoneare poorly measured, and there is no chronicle of observations. In thiscontext, the sediment monitoring appears indispensable for the quantificationof sediment transport at the outlet. This study focuses on the largestwatershed in Tunisia, the Wadi Medjerda (23 600 km 2) . The mainobjective of this work is to assess the reduction of sediment transportfollowing anthropogenic intensification on the basin, especially since theconstruction of many large dams. In order to collect information on actualdeposits over several years, the paleo-hydrological approach was appliedthrough the study of sediment cores sampled in the low valley meanders onalluvial terraces, after the last dam (Sidi Salem, the largest water storagecapacity over the basin), but before the estuary to avoid marine influenceand near a hydrological station (Jdaida). The sedimentary deposits of theriver provide key information on the past sedimentary inputs. A visiblesuccession of sedimentary layers corresponding to the deposits of successivefloods on the study site has been determined and the history of thesedimentary contributions of the Medjerda is reconstructed by this approach.The thickest layers of sedimentary deposits are related to exceptionalevents. They are mainly concentrated on the lower part of the core and aremainly composed of sands. The first 1.2 m of the core from the bottom upwardrelates to 10 years of river discharges, as can be determined from the 137 Cs datation. The next upward 1.05 m ofcore relates to the following 20 years of discharges, up to 1981, date of theconstruction of the Sidi Salem dam, and is composed of a mix of sand, siltsand clays. The last 75 cm of core near the surface is only composed of clayswith thin silt bands, and relates to a period of 32 years. We thus observethat there is no more sand deposits in the river bed since the constructionof the Sidi Salem dam. The deficit of sediment supply to the sea is viewed asa major factor to be taken into account for better understanding of thedynamics of coastal areas in the context of global climate change.

proceedings of the international association of hydrological sciences

Etude de l'impact des barrages sur la réduction des transports sédimentaires jusqu'à la mer par approche paléohydrologique dans la basse vallée de la Medjerda