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Chapitre D'ouvrage Année : 2022

Géoressources et Vulnérabilité des zones humides : Cas de la Sebkha Moknine

Résumé

Located mainly in North Africa, the sebkhas are considered the largest wetlands in the Mediterranean basin. Early studies of hypersaline environments began in late 1960 at Cap Bon and southeastern Tunisia's evaporite systems. The aim of this work is to give a summary of the work done on the Moknine sebkha. It will focus on the history of the formation of this hypersaline ecosystem and on environmental threats and problems. The results of these studies rely on geochemical and sedimentological analyses carried out using high performance techniques (GC MS, Rock Eval, RX, Particle size...). The Sebkha fill materials include a variety of granulometric subdivisions, including sands and clays, revealing their detrital origin. Based on the distribution of n-alkanes in the clay phase associated with the t0 interval in the model of the evolution of the Moknine sebkha, it appears that the sebkha was more extensive in the west, and the clay sequence in the peripheral profiles corresponds to its former center. An imbalance in the system is caused by the location of a sewage treatment plant in the north. Investigations of the organic geochemistry of the waters and sediments of the evaporative ecosystem of Moknine have revealed organic pollution and algal blooms. To achieve sustainable development, it will be necessary to integrate the exploitation of natural resources (ornithological site, brine, cysts of Artemia, halophilic plants) with the rehabilitation of the sebkha.
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Dates et versions

hal-04395091 , version 1 (18-01-2024)

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  • HAL Id : hal-04395091 , version 1

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Raja Chairi. Géoressources et Vulnérabilité des zones humides : Cas de la Sebkha Moknine. Observatoire, A paraître. ⟨hal-04395091⟩
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