Estudio de la dinámica sedimentaria de la Laguna costera del Sur de Túnez (Túnez, Mar Mediterráneo)

M. Abidi; R. Ben Amor; M. Gueddari

doi:10.3989/egeol.43194.487

Autores/as

M. Abidi Laboratory of Geochemistry and Environmental Geology, Department of Geology, Faculty of Sciences of Tunis, University of Tunis https://orcid.org/0000-0001-6121-4692
R. Ben Amor Laboratory of Geochemistry and Environmental Geology, Department of Geology, Faculty of Sciences of Tunis, University of Tunis https://orcid.org/0000-0003-3573-4082
M. Gueddari Laboratory of Geochemistry and Environmental Geology, Department of Geology, Faculty of Sciences of Tunis, University of Tunis https://orcid.org/0000-0003-1566-1242

DOI:

https://doi.org/10.3989/egeol.43194.487

Palabras clave:

Laguna costera, dinámica de sedimentos, mineralogía, granulometría, proyecto de restauración, Túnez

Resumen

La laguna sur de Túnez, una laguna costera mediterránea poco profunda, se sometió a importantes trabajos de restauración durante el período 1998-2001, lo que ha llevado a cambios estructurales y funcionales de este ecosistema costero. En este trabajo se presenta un estudio integral de dinámica sedimentaria basado en datos hidrodinámicos, análisis granulométrico, mineralogía y evaluación de impacto. El proyecto de restauración, especialmente el establecimiento de la puerta de entrada de los canales de Rades y Túnez, impuso una dirección de flujo de agua este-oeste controlando la clasificación local de sedimentos. El análisis de tamaño de grano del sedimento superficial muestra que el fondo de la laguna está revestido por sedimentos finos (<63 ?m, 50-90%). El transporte de sedimentos está controlado por las corrientes de agua de la laguna que inducen una clasificación de tamaño de grano este-oeste. El extremo oriental de la laguna, cerca de la entrada, está bordeado por arena mediana, moderadamente clasificada y transportada por saltación. Los lados central y occidental de la laguna están cubiertos por arena fina, mal clasificados y acumulados en condiciones hidrodinámicas relativamente tranquilas. Los resultados mineralógicos revelan la siguiente asociación: cuarzo (13 a 69%), calcita biogénica (15 a 81%), aragonita (0 a 8%), pirita (0 a 1,75) y magnetita accesoria, esmectita, ilita y caolinita. La laguna parece ser una zona protegida como resultado del proyecto de restauración que forma una barrera física para la cantidad de materiales sedimentarios del Golfo de Túnez.

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