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Magnan J.-P.,University Paris Est Creteil | Ejjaaouani H.,Laboratoire Public DEssais et DEtudes | Shakhirev V.,Laboratoire Public DEssais et DEtudes | Bensallam S.,Laboratoire Public DEssais et DEtudes
Bulletin des Laboratoires des Ponts et Chaussees | Year: 2013

This paper analyses the behaviour of expansive clays during humidification and drying from the point of view of thermodynamics and the phenomena at molecular and particle scale and from the point of view of the measurements that can be made in a soil mechanics laboratory, using classical test equipment. The first part reviews the concepts developed in the scientific literature. The second part presents the results of two laboratory studies on a Moroccan clay, aiming at assessing the repartition of water between its different possible states in the soil and at characterising the expansion and shrinkage curves of the same soil. The shape of the swell and shrink curves and their differences are qualitatively explained. Source


Aouiche I.,Cadi Ayyad University | Daoudi L.,Cadi Ayyad University | Anthony E.J.,Aix - Marseille University | Sedrati M.,University of Southern Brittany | And 2 more authors.
Journal of African Earth Sciences | Year: 2016

This study discusses the morphological changes and evolution of Agadir Bay beach (Morocco) in response to eight storms between January 2014 and March 2014. A comparison is carried out of the evolution and variability of the beach in a sector of the bay protected by the commercial harbour of Agadir relative to a sector down drift of the harbour that is more exposed to waves, and changes affecting the beach following these storms are examined. Wave influence is evaluated using numerical simulations. The results show that despite being of relatively low intensity, the two first storm events, and especially storm 1, are responsible for major beach morphological changes. Three zones were identified as a function of the beach sediment dynamics: (i) a northern zone, representing the sector of the beach protected by Agadir harbour, with a net loss of about 21% of the total sediment, (ii) a southern zone, corresponding to the exposed sector with a net loss reaching74% of the total sediment, and (iii) a sector of residual dune that recorded no significant change during the storms. © 2015 Elsevier Ltd. Source


Aouiche I.,Cadi Ayyad University | Daoudi L.,Cadi Ayyad University | Harti A.,Laboratoire Public DEssais et DEtudes | Ziane E.,Laboratoire Public DEssais et DEtudes
Journal of Materials and Environmental Science | Year: 2015

The study of the evolution of the coastline is based on the determination of the dynamic equilibrium of the system, which must integrate components at different temporal and spacial scales. In order to provide additional knowledge on this issue, we treat the case of the coastal of Agadir. This coastline suffers from a lot of human intervention and its dunes suffer from severe erosion. The southern beach of Agadir is experiencing a very clear loss of beach sand; the coastline recedes; threatening developments and tourist attraction on the site. The study of the evolution of the coastline of the bay of Agadir has allowed us the quantification of the linear erosion over a period of 49 years. It shows that the build up or loss of beach sand varied during this period. The area located near the northern breakwater built in 1968 (Sector 2), tapers with an average rate of 2.75 ± 0.94 m/an. The southern sector across from hoteliers complex, records an erosion rates of about 3.07 ± 0.94 m/an, and the northern of sector 5 represented by the mouth of the Oued Souss, shows an average erosion rate of 6.024 ± 0.833 m/an. Source

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