Evidence for an underground runoff and soil permeability at the Ouled Fayet (Algiers,Algeria) subsurface landfill pilot project from geophysical investigations |
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| Authors: | Leila Djadia Djamel Machane Jean-Luc Chatelain Abdesslam Abtout Rabah Bensalem Mehdi Amine Guemache Bertrand Guillier Amar Boudella El-Hadi Oubaiche |
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| Institution: | 1.Département de Géophysique, Centre de Recherche en Astronomie,Astrophysique et Géophysique (CRAAG),Bouzareah, Algiers,Algeria;2.Centre national de recherche appliquée en Génie paraSismique (CGS),Algiers,Algeria;3.IRD, Laboratoire de Géophysique Interne et de Tectonophysique,CNRS, Université Joseph Fourier,Grenoble,France;4.Centre national de recherche appliquée en Génie paraSismique (CGS),Algiers,Algeria;5.Département de Géophysique,Université des Sciences et de la Technologie Houari Boumediene (USTHB),Bab Ezzouar, Algiers,Algeria |
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| Abstract: | Results from geophysical investigations (electrical resistivity, electromagnetic mapping and seismic refraction) on an excavated
cell of the Ouled Fayet (Algiers, Algeria) pilot landfill indicated the presence of an underground runoff and permeable soil
underneath the cell. These results contradict those obtained by a feasibility study, based, however, only on the analysis
of seventy-six 10-m drilling cores. The 1D boreholes information has been proven to be insufficient and to give biased results.
The presence of water at depth is evidenced by lower resistivity, high conductivity anomalies and increase of P-wave velocity.
Thus, to the contrary of what is claimed in the feasibility study, a threat of leachate pollution is real. This study shows
that landfill construction studies cannot give trustful results without geophysical investigations. More specifically, in
Algeria, it is imperative to elaborate a landfill construction code, which should include mandatory geophysical prospecting
and deeper drilling cores. |
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