Présentations Colloques

Poster
5.02
Session 5.02: Groundwater and global change
Nacira (orateur)
ROLE OF GROUND AND SURFACE WATER IN TRIGGERING LANDSLIDES IN GREAT KABYLIA (TIZI-OUZOU, ALGERIA)
Landslides in unconsolidated formations are widespread in Algeria, particularly in great Kabylia. Indeed the morphology of the North of Algeria, essentially characterized by mountains and steep slopes, often gives rise to landslide of variable intensity. Water play a central role in the landslides processes in this region+ it exerts on these soils a special influence which translates into several instabilities. This communication aims to the study of the impact of ground and surface water on the triggering of landslides in great Kabylia and numerical modeling of these instabilities caused by water in its various forms. The increase of the water content of ground is usually closely linked to the weather conditions- It is due mostly to seepage or groundwater lifts following the heavy or prolonged rainfall, at which can be added the snowmelt. Landslides in great Kabylia (Ain el Hammam, Azazga, Tigzirt, Illilten, Tala Tgana, Azeffoune … etc.) occurred or reactivated following the heavy rains and melting snowpack especially in winter 2012. If one must more often attributed the increase in water content of ground to natural causes, it also happens to be anthropogenic due to the presence of man and his activities (leakages, the rupture of underground pipes, concentration of water discharges after a waterproofing surfaces, abandonment of water sources, unplanned urbanization). The results of this study show the need to the realization of ground and surface runoff water management system (drainage systems blanked, bad raccordment in systems supply of potable water, the return to the use of water sources in mountains to reduce the pressure exerted by the ground water).
Algeria