1. Laboratoire de Mécanique des Fluides et des Transferts Thermiques, Faculté des Sciences; Univ. Ibn Tofail; Kénitra Morocco
2. Dep. of Geotechnical Engineering and Geoscience; Technical Univ. of Catalonia-UPC; Gran Capitan s.n. 08034 Barcelona Spain
3. Institute of Earth Sciences “J. Almera”; Spanish Council for Scientific Research; Barcelona Spain