agriculture; applied geophysics; groundwater; hydrogeophysics; Morocco; Tabular Middle Atlas; vertical electrical sounding; Materials Science (all); Instrumentation; Engineering (all); Process Chemistry and Technology; Computer Science Applications; Fluid Flow and Transfer Processes; General Engineering; General Materials Science
Abstract :
[en] Vertical electrical sounding (VES) as a geoelectrical method has proven its effectiveness throughout the history of groundwater geophysical investigation. In this sense, VES was carried out 47 in the study area with the aim of determining the geometry and limits of Quaternary basaltic aquifer formations and, above all, the location of electrical discontinuities in the area located in the north of Morocco, between the center of Almis Guigou and the city of Timahdite. This area is experiencing an overexploitation of the groundwater due to excessive pumping and the development of intensive agriculture activities, resulting in a continuous decrease in piezometric levels. The processing of the diagrams by WINSEV software showed the presence of an electrically resistant surface level, attributed to basaltic formations, of the Quaternary age, whose thicknesses reach at least 150 m to the SW of the area. This level is superimposed on a moderately conductive horizon which, according to local geology, corresponds to Pliocene marl and limestone alternations. The correlation of VES interpretation models allowed us to elaborate thematic maps and geoelectrical sections which illustrate the vertical and lateral extension of the basaltic reservoir as well as its thickness, which decreases in general from the south-west to the north-east; however, the main electrical discontinuities also correspond to faults and fractures, and they show a NE–SW direction sub-parallel to the major accidents of the Middle Atlas. A prospectivity map of the local aquifer was generated, coinciding with regional fault lines and confirmed by the alignment of very good flowing water boreholes. This geophysical study by electrical sounding shed light on the geometry and extension of the aquifer and opened avenues to draw further conclusions on its physical and hydrodynamic characteristics, as well as to optimize the future siting of groundwater exploitation boreholes through the elaboration of the local aquifer prospectivity map.
Disciplines :
Earth sciences & physical geography
Author, co-author :
El Makrini, Said; CartoTec Team, Faculty of Sciences, Moulay Ismaïl University, Meknes, Morocco
Mamouch, Younes ; Laboratory Physico-Chemistry of Processes and Materials, Research Team Geology of the Mining and Energetics Resources, Faculty of Sciences and Technology, Hassan First University of Settat, Settat, Morocco
El Makrini, Hassane; CartoTec Team, Faculty of Sciences, Moulay Ismaïl University, Meknes, Morocco
Randazzo, Giovanni ; Dipartimento Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università Degli Studi di Messina, Messina, Italy
Roubil, Allal ; Laboratory of Geoengineering and Environment, Research Group “Water Sciences and Environment Engineering”, Department of Geology, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
El Hafyani, Mohammed ; Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes
Lanza, Stefania; GeoloGIS s.r.l., Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze Della Terra, Università Degli Studi di Messina, Messina, Italy
Muzirafuti, Anselme ; Dipartimento Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università Degli Studi di Messina, Messina, Italy
Language :
English
Title :
Vertical Electrical Sounding (VES) Technique to Map Potential Aquifers of the Guigou Plain (Middle Atlas, Morocco): Hydrogeological Implications
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