Benmoussa T. auteur aut IRD Amrouni O. auteur aut IRD Dezileau L. auteur aut IRD Mahé Gil auteur aut IRD Abdeljaouad S. auteur aut IRD text bookSection eng text/pdf reformatted digital access Recent sedimentary and morphological changes at the new mouth of Medjerda-River (Gulf of Tunis) are investigated using a multiproxy approach of sediment cores complited by 210Pbex and 137Cs method dating. The subject of the study is to focus on surveying the sedimentary evolution of Medjerda-Raoued Delta caused by the human intervention in the management of the main tributaries of the Medjerda-River (artificial channel of Henchir Tobias). Sediment cores (CEM-1 and CEM-3) were subjected to both multiproxy approaches (Grain size, geochemical analysis and dating radiometric 210Pbex and 137Cs). The sedimentological analysis of the new deltaic deposits shows a progradation sequence with the silt and clay deposits on the historic sandy substratum. The mean grain size evolution on the old beach profile shows a decreasing trend from backshore (CEM-3) to nearshore (CEM-1). The geochemical results show varying concentrations of chemical elements such as Fe, K, Rb, Nb, Cr, Ti, Ba, Ca, Sr, Zr, V, and potentially toxic metal trace elements such as Pb, Zn and the As. The Principal component Analysis (PCA) applied in the geochemical elements evolution confirms the marine origin of the sand deposits in the basic layers of the two cores. The chronological method (210Pbex and 137Cs) affirms that the first fluvial deposits were set up only after 1950. The sedimentological and geochemical result confirm the actual unless of coarser fluvial supplies under the human activities leading the negative coastal sediment balance and the shoreline retreat as well. specialized SEDIMENTATION DELTAIQUE FACTEUR ANTHROPIQUE EVOLUTION METHODE DATATION GEOCHIMIE GRANULOMETRIE SEDIMENT COURS D'EAU DELTA CANAL CAROTTAGE TUNISIE 064SEDIM 064GEOCHI Mahé Gil ed. edt IRD Heal K. ed. edt IRD Gupta A.B. ed. edt IRD Aksoy H. ed. edt IRD 377 77-81 Wallingford AISH 2018 Water Quality and Sediment Transport Issues in Surface Water, Port Elizabeth (ZAF), 2017/07/10-14 377 https://www.documentation.ird.fr/hor/fdi:010078620 10.5194/piahs-377-77-2018 978-1-5108-6145-9 [F B010078620] https://www.documentation.ird.fr/hor/fdi:010078620 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-07/010078620.pdf IRD - Base Horizon / Pleins textes 2020-06-22 2023-07-11 fdi:010078620 fre