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Recent Geochemical and Grain Size Distribution of Terrestrial Sediment in Coastal Area from the Watershed of Medjerda River, Gulf of Tunis

  • Thouraya BenmoussaEmail author
  • Oula Amrouni
  • Laurent Dezileau
  • Gil Mahé
  • Domenico Chiarella
  • Saâdi Abdeljaouad
Conference paper
Part of the Advances in Science, Technology & Innovation book series (ASTI)

Abstract

The geochemical and grain size analysis were carried out on surface and down core sediments from the present-day alluvial-coastal plain of the Medjerda River, Gulf of Tunis, Tunisia. The aim of this paper is to characterize the geochemical and grain size distribution of sediments and its relationship with the hydrodynamics extreme events occurring during the last century. Using a multi proxy approach, six turbidities layers have been identified in down core sediment (i.e. TL-1, TL-2, TL-3, TL-4, TL-5, TL-6, TL-7 and TL-8) characterized by multimodal grain size distribution. The terrestrial sediment which feeds the northern coastal of the Gulf of Tunis is characterized by very fine-grained sediment (clay and silt). The geochemical signature shows a highly concentration of Rb, Ti, Zn and Pb. The Medjerda River is the mainly source of silts and clay sediment. Besides, the mining pollution (Zn and Pb) is relatively strong in the coastal area, especially during the great floods events of Medjerda watershed recorded in the 1953; 1957; 1969 and 1973. Even during high frequency events, the sediments are devoid of any coarse fraction.

Keywords

Coastal Medjerda river Extreme floods Turbidities layers Mining pollution 

References

  1. 1.
    Flemming, B.W., Hansom, J.D.: Estuarine and coastal geology and geomorphology–A synthesis, In: Wolanski, E., McLusky, D.S. (eds.) Treatise on Estuarine and Coastal Science, vol. 3, pp. 1–5. Academic Press, Waltham (2011)Google Scholar
  2. 2.
    Syvitski. P.M., Kettner. A.: Sediment flux and the anthropocene. Phil. Trans. R. Soc. A 369, 957–975 (2011).  https://doi.org/10.1098/rsta.1010.0329
  3. 3.
    Croudace, I.W., Rindby, A., Rothwell, R.G.: ITRAX: description and evaluation of a new multi-function X-ray core scanner. Spec. Publ. Geol. Soc. Lond. 267, 51–63 (2006)CrossRefGoogle Scholar
  4. 4.
    Affouri, A., Dezileau, L., Kallel, N.: Extreme flood events reconstruction during the last century in the El Bibane lagoon (Southeast of Tunisia): a multi-proxy approach, Clim. Past Discuss. (2016).  https://doi.org/10.5194/cp-2016-40
  5. 5.
    Benmoussa, T., Amrouni, O., Dezileau, L., Mahe, G., Saâdi, A.: Impact of the Medjerda Sedimentary Fluxes on the Morphodynamic Equilibrium of the Northern Coast of the Gulf of Tunis (Medjerda-Raoued coast), PIAHS, vol. 377. Port Elizabeth, South Africa (2018).  https://doi.org/10.5194/piahs-377-77-2018CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Thouraya Benmoussa
    • 1
    Email author
  • Oula Amrouni
    • 2
  • Laurent Dezileau
    • 3
  • Gil Mahé
    • 4
  • Domenico Chiarella
    • 5
  • Saâdi Abdeljaouad
    • 1
  1. 1.Laboratory of Energetic, Mineral Resources and Environment, Faculty of Sciences of TunisUniversity of Tunis El-ManarTunisTunisia
  2. 2.Laboratory of Marine EnvironmentNational Institute of Marine Sciences and TechnologiesSalammbôTunisia
  3. 3.Laboratoire Morphodynamique Continentale et CôtièreUniversity of CaenCaenFrance
  4. 4.UMR HydroSciences Montpellier/IRDMontpellierFrance
  5. 5.University of LondonEghamUK

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