IMPACT DU CHANGEMENT CLIMATIQUE SUR L’AQUIFERE HAUTERIVIEN DU BASSIN D’ESSAOUIRA (MAROC)
Journal Title: Larhyss Journal - Year 2016, Vol 25, Issue 25
Abstract
Climate variability is a phenomenon whose causes are difficult to determine, can be manifested by recurrent episodes of drought, desertification, scarcity of water and change their chemistry, soil erosion and salinization. This variability may have effects on natural resources such as groundwater. To decipher the impact of climate variability on groundwater from the Hauterivian aquifer of Essaouira basin, ruled by a semi-arid climate, three approaches were used: (i) the piezometric technique that allowed drawing piezometric maps of the aquifer from 1976 to 2015. It showed that the water level from this aquifer is closely related to precipitation. (ii) The hydrogeochemical approach revealed an evolution of chemical facies from Na-Cl to Mg-HCO3 type between 1996 and 2015. (iii) The isotopic tool was used to determine (1) a local meteoric line (LMWL) close to the global meteoric line (GMWL) characterizing precipitation of oceanic origin and (2) the charging altitude of the aquifer based on 18O.
Authors and Affiliations
OUHAMDOUCH S. | GEOLAB, faculté des sciences Semlalia, Université Cadi Ayyad, Marrakech, Maroc, Centro de Ciências e Tecnologias Nucleares, IST/CTN, Universidade de Lisboa, Portugal, BAHIR M. | Département de géologie, Ecole Normale Supérieure de Marrakech, Université Cadi Ayyad, Marrakech, Maroc, CARREIRA P. | GEOLAB, faculté des sciences Semlalia, Université Cadi Ayyad, Marrakech, Maroc, Centro de Ciências e Tecnologias Nucleares, IST/CTN, Universidade de Lisboa, Portugal, CHKIR N. | Ecole Nationale d’Ingénieurs de Sfax, Radio-Analyses et Environnement, BP : W. 3038, Sfax, Tunisie, GOUMIH A. | Département de géologie, Ecole Normale Supérieure de Marrakech, Université Cadi Ayyad, Marrakech, Maroc
Keywords
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