Estudios Geológicos, Vol 75, No 1 (2019)

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


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

M. Abidi
Laboratory of Geochemistry and Environmental Geology, Department of Geology, Faculty of Sciences of Tunis, University of Tunis, Túnez
orcid http://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, Túnez
orcid http://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, Túnez
orcid http://orcid.org/0000-0003-1566-1242

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.

Palabras clave


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

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