National Institute of Research and Chemical and Physical Analysis

Sidi Bou Saïd, Tunisia

National Institute of Research and Chemical and Physical Analysis

Sidi Bou Saïd, Tunisia
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Saidi H.,University of Tunis | Souissi R.,National Institute of Research and Chemical and Physical Analysis | Zargouni F.,University of Tunis
Bulletin of Engineering Geology and the Environment | Year: 2012

The coastline between Radès and Ezzahra, NE Tunisia, suffered from erosion during a strong storm in 1981. As a consequence, between 1985 and 1988 a single breakwater was constructed in Radès and two successive breakwaters in Ezzahra. The paper reports a study of the effectiveness of these structures and considers the other factors which influence the accretion/erosion of the shoreline. © 2012 Springer-Verlag.


Saidi H.,Tunis el Manar University | Souissi R.,National Institute of Research and Chemical and Physical Analysis | Zargouni F.,Tunis el Manar University
Arabian Journal of Geosciences | Year: 2014

This work presents a recent grain size study characterizing superficial sediments of the whole sectors of the Gulf of Tunis which extends from Sidi Ali El Mekki to Sidi Daoued. In this study, a total of 112 samples were collected from different depths following 26 profiles perpendicular to the shore and from rivers. The determination of the proportions of coarse and fine fractions and the interpretation of the grain size results lead to dividing the Gulf of Tunis into two principal coasts: (1) the western coast situated between Sidi Ali El Mekki and Borj Cédria, which is characterized by three sedimentary facies: (a) a sandy facies along the coastline, (b) a mixed facies between Ghar El Melh and Raoued, near the Medjerda River, and between La Goulette and Ezzahra, near the Miliane River, and (c) a muddy facies between Ghar El Melh and Kalâat El Andalous and covered by fine to very fine sands, and (2) the eastern coast, which is characterized by a sandy facies and covered by medium to coarse sands. The dominant N-E and N-W waves generate longshore currents that provide sediment transport following the directions N-S, from Sidi Ali El Mekki to Kalâat El Andalous; SE-NW, from Gammarth to Raoued; NE-SW, from Sidi Bou Saïd to La Goulette and from Sidi Daoued to Bir El Jadi; SE-NW, from Hammam-Plage to Ezzahra; and SW-NE, from Port aux Princes to Rtiba. © 2013 Saudi Society for Geosciences.


Saidi H.,University of Tunis | Souissi R.,National Institute of Research and Chemical and Physical Analysis | Zargouni F.,University of Tunis
Rendiconti Lincei | Year: 2012

The coastline of Soliman (North-East of Tunisia) suffered from erosion mainly during a strong storm that occurred in 1981. Two breakwaters were constructed in 1989 to protect the shoreline in front of the Solymar hotel and five detached breakwaters were implanted between 1989 and 1990 for the protection of the zone of the Soliman Beach from shoreline retreat. The evolution of the coastal area and the effect of these breakwaters were studied using aerial photographs treated by digital photogrammetric methods. The distances of coastline retreat or advance and the areas lost or gained along the studied zone were calculated by GIS software. The breakwaters of the Solymar hotel formed two tombolos. The breakwaters of the Soliman Beach which are very near the shoreline developed very small tombolos and those which are very far form the shoreline gave rise to eroded areas. The studied zone is subjected to important erosion evaluated at-167,354 m2 despite the installation of the breakwaters. Such result is explained by the effect of the protective structures' characteristics mainly the breakwaters lengths, the shoreline-breakwater distance, and the gap between successive breakwaters. In addition, the gyratory currents generated by the North North-Western waves play a great role in depriving the beach of Soliman of sediments. © 2012 Accademia Nazionale dei Lincei.


Saidi H.,University of Tunis | Souissi R.,National Institute of Research and Chemical and Physical Analysis | Louati M.,University of Tunis | Zargouni F.,University of Tunis
Rendiconti Lincei | Year: 2014

Morphological changes and both surface and volume budgets along the Mediterranean coastline Sidi Ali El Mekki-Gammarth which is located at the western fringe of the Gulf of Tunis (NE Tunisia) are studied, over the 1887-2010 period, by ancient minute of bathymetry and aerial photographs treated using digital photogrammetric methods and GIS tools. The accretion areas are located upstream the fishing port of Ghar El Melh which interrupts alongshore sediment transport (0.22-0.66 ± 0.21 m/year, i.e., 21,309 ± 1,113 m 2/year, i.e., 106,546 ± 5,565 m3/year) and around the recent mouth of the Medjerda River because of fluvial deposits and accumulation of sediment transported by drift currents (2.35-3.35 ± 0.21 m/year, i.e., 4,956 ± 1,050 m2/year, i.e., 24,780 ± 5,250 m3/year). The erosion areas are situated downstream the fishing port of Ghar El Melh (-4.32 to 0.9 ± 0.21 m/year, i.e., -4,822 ± 1,232 m2/year, i.e., -24,114 ± 6,163 m3/year), around the ancient mouth of the Medjerda River which was abandoned and deprived from fluvial sediment supply (-15.44 to -4.55 ± 0.21 m/year, i.e., -4,499 ± 264 m2/year, i.e., -22,495 ± 1,323 m 3/year). The eroded sediments are displaced to the south giving rise to the sand spit of Kalâat El Andalous. Coastline retreated also along the Raoued-Gammarth sector which lost sediments by SE-NW drift currents (-0.75 to -0.23 ± 0.21 m/year, i.e., -3,765 ± 1,113 m2/year, i.e., -18,828 ± 5,565 m3/year). The alongshore distribution of accretion/erosion patterns lead to divide the studied coastline into three littoral cells limited by natural boundaries: (a) Cap Sidi Ali El Mekki - the ancient mouth of the Medjerda River, (b) from the ancient to the recent mouth of the Medjerda river, and (c) the recent mouth of the Medjerda River-Cap Gammarth. © 2014 Accademia Nazionale dei Lincei.

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