Surface sediment dynamics along the eastern coast of Djerba Island (Gabes Gulf, Tunisia)

Brahim, Mounir Ben; Atoui, Abdelfattah; Sammari, Chérif; Aleya, Lotfi

doi:10.1016/j.jafrearsci.2014.01.003

Cited by 21 publications

(8 citation statements)

References 12 publications

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“…), depending on exchange energy (waves, tides, currents) and bottom features (sediments, bio‐constructions) (Brahim et al . ). This investigation was carried out in the Attaya region of Kerkennah Island, located off the southern coast of Tunisia (Fig.…”

Section: Methodsmentioning

confidence: 97%

“…The marine environment in the Gulf of Gabes (southern coast of Tunisia) is a system with hydrodynamic, morphologic and sedimentologic properties that vary in time and space (Abdennadher & Boukthir 2006;Sammari et al 2006;Hattour et al 2010), depending on exchange energy (waves, tides, currents) and bottom features (sediments, bio-constructions) (Brahim et al 2014). This investigation was carried out in the Attaya region of Kerkennah Island, located off the southern coast of Tunisia ( Fig.…”

Section: Study Areamentioning

confidence: 99%

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Spatial scale variability in shoot density and epiphytic leaves ofPosidonia oceanicaon Kerkennah Island (Tunisia) in relation to current tide effects

et al. 2014

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A study was undertaken of the patterns of spatial variability, epiphytic biomass and distribution of epiphytic fauna and flora of Posidonia oceanica. Samples were taken at four stations located approximately 4 km apart, exposed to different current conditions. Stations A and B, situated near the Oued Mimoun tidal channel with its relatively strong bi‐directional flows, were affected by high current tide. The other two stations, North Oued Mimoun (L1) and South Oued Mimoun (L2), were located further from the channel, in low current tide conditions. Sampling was conducted in the Attaya area of Kerkennah Island (Tunisia) in August 2009 at depths between 2 and 3 m, with the results indicating differences among the stations. Shoot density decreased when exposed to high levels of hydrodynamic activity generated by current tides whereas the epiphytic biomass of P. oceanica leaves decreased at sheltered stations located far from the channel. Epiphytic algae such as Heterokontophyta, Rhodophyta and Chlorophyta, and epiphytic fauna represented by Bryozoa, Hydrozoa, Annelida, Porifera and Tunicata, dominated the epiphytic assemblages and were abundant at the station most exposed to high current tide hydrodynamics. Cyanobacteria, however, were dominant in stations exposed to low current tide.

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Section: Methodsmentioning

confidence: 97%

Section: Study Areamentioning

confidence: 99%

Spatial scale variability in shoot density and epiphytic leaves ofPosidonia oceanicaon Kerkennah Island (Tunisia) in relation to current tide effects

et al. 2014

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“…The study area is part of a semi-diurnal tide system where Djerba Island acts as a shock absorber of wave action. The high tide amplitude varies between 0.40 and 2 m (Brahim et al, 2014). During the equinoxes, the tidal amplitude can reach 1 m. The duration of each tide is 6 hours, and each tidal cycle includes approximately 10 to 11 days of spring tide and 4 to 5 days of neap tide .…”

Section: Introductionmentioning

confidence: 99%

Modern and Holocene microbial mats and associated microbially induced sedimentary structures (MISS) on the southeastern coast of Tunisia (Mediterranean Sea)

2020

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On the southeastern Tunisian coastline, very diverse living microbial mats colonize the lower supratidal and intertidal zones, and locally may extend into the upper infratidal zone. The interaction between the benthic cyanobacteria and their siliciclastic substratum leads to the development of several types of microbially induced sedimentary structures (MISS). The mapping of the microbial mats has allowed the identification of the types of MISS that characterize the different segments of the coastal environment. The modern microbial mats have been compared with those recorded at the top of the Holocene deposits, which are composed of biodegraded microbial black mats alternating with white laminae made of clastic and evaporitic sediments, indicative of very high frequency cycles of flood and drought. A hypothetic profile showing their occurrences along the different areas bordering the coastline is proposed as a guide for the reconstruction of the ancient depositional environment. The roles of tidal dynamics, storms, and climate in controlling their genesis and spatial distribution, are discussed and highlighted. The modern MISS of southeastern Tunisia are compared with their equivalents that are well documented through the different geological eras.

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“…La majorité des vagues (96%) ont une période inferieure à 4s. Ces houles malgré leurs faibles amplitudes sont combinées aux effets périodiques de la marée qui sont importants dans le golfe de Gabes peuvent jouer un rôle important dans la dynamique sédimentaire dans la frange littorale de la Skhira (BRAHIM et al, 2014). Le vent engendre donc un déplacement des masses d'eau parallèlement à la ligne de rivage vers le nord-est.…”

Section: Résultatsunclassified

Dynamique sédimentaire dans la zone littorale de la Skhira (golfe de Gabès, Tunisie)

Atoui¹,

Sammari²,

Aleya³

2014

XIIIèmes JNGCGC, Dunkerque

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La distribution spatiale de la taille des particules dans la frange littorale de la Skhira et les vitesses et les directions des courants analysés ont permis d'avoir une vue d'ensemble sur la dynamique et le transport des sédiments dans la zone. La taille moyenne des grains de sable montre que le fond est constitué de sables fins et de sables moyens près de la côte et de sables vaseux au large. Le pourcentage de la fraction fine (<63 µm) par rapport à la fraction grossière (>63 µm) est plus important au large. Les mesures réalisées à l'aide d'un ADCP ont montré que le courant principal a une direction de 60° par rapport à l'est. Il a une direction sud-ouest/nord-est parallèle à la ligne de côte. La valeur de la vitesse maximale suivant l'axe principal (sud-ouest/nordest) est de l'ordre de 13 cm s -1 , alors qu'elle est de l'ordre de 4.5 cm s -1 suivant l'axe mineur de direction est-ouest. La rose des courants montre que les courants parallèles à la côte sont en général faibles à modérés, mais ils peuvent dépasser 20 cm s -1 . La distribution des grains de sable a montré qu'il existe une amélioration du tri granulométrie vers le nord-est. En revanche, on n'observe pas clairement de diminution du diamètre moyen vers le large.

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Surface sediment dynamics along the eastern coast of Djerba Island (Gabes Gulf, Tunisia)

Cited by 21 publications

References 12 publications

Spatial scale variability in shoot density and epiphytic leaves ofPosidonia oceanicaon Kerkennah Island (Tunisia) in relation to current tide effects

Spatial scale variability in shoot density and epiphytic leaves ofPosidonia oceanicaon Kerkennah Island (Tunisia) in relation to current tide effects

Modern and Holocene microbial mats and associated microbially induced sedimentary structures (MISS) on the southeastern coast of Tunisia (Mediterranean Sea)

Dynamique sédimentaire dans la zone littorale de la Skhira (golfe de Gabès, Tunisie)

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