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Geophysical Contribution to the Determination of the Limit between Laayoune and Foum El Oued Aquifers, Origin of Supply Sources of Oued Sakia El Hamra, Laayoune Province, Morocco

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International Journal of Geosciences 2019年第11期10卷 1008-1035页

作者： moha.ed chibout Anasse Benslimane moha.ed El Mokhtar Fatima Zahra Faqihi Sidi Mokhtar El Kanti Ahmed Ntarmouchant Laboratory of Geodynamics and Natural Resources (LGRN) Faculty of Sciences Dhar Mahraz Sidi Mohamed Ben Abdellah University Fez Morocco Laboratory of Geosciences and Natural Resources Faculty of Sciences University Ibn Tofail Kenitra Morocco. AFRICA GEO-SERVICES Company 33 Offices Al Manar Street Abd Elkarim Khattabi Fez VN Morocco Hydraulic Basin Agency of Sakia El Hamra and Oued ed-Dahab Administrative District Laayoune Morocco

Laayoune and the Foum El Oued aquifers are in hydraulic communication only at the level of Oued Saguia El Hamra. The present study has accordingly made use of all the hydrogeological, hydrological, geological and geophysical data that preceded the watershed of Oued Saguia El Hamra in its downstream part. These data are by no means omplementary with the objective of having a better understanding of the boundary line between Laayoune and Foum El Oued aquifers and the origin of feeding the sources of Oued Saguia El Hamra. This study will focus only on the previous geophysical studies where a reinterpretation of electrical soundings has proved useful as a result of the recent well-logging results. It makes it possible to highlight the presence of a significant rise in the truncated marly substratum of Oued Saguia El Hamra and depressions (left and right banks) which could correspond to stream channels or depressed areas. At the level of the Wadi bed, there has been a regular immersion of the conductive level roofs from east to west towards Foum El Oued favoring the flow of wastewater from the zone and spraying the brackish water sources towards the groundwater of Foum El Oued. In the light of the reinterpretation of electric polls, plus as well as the geophysical surveys by electrical tomography and high definition made at the right and left banks of the Oueed Saguia El-Hamra, it was possible to verify the existence of dry ridge separating the two webs of Laayoune and Foum El Oued and stream channels or depressed areas of the left bank for drainage of brackish water to sources located along Oued Saguia El Hamra. The true resistivity models tomography profiles confirm the presence of the backbone at the left and right banks and the graben of the left bank for underground water drainage of the web Laayoune to sources welling the river Saguia El Hamra. They reveal the presence of a quaternary plio-cover (coastal platform Moghrebian) as being heterogeneous and affected by m

关键词： Laayoun and Faum Al Oued Aquifers Ridge Limit Wastewater Brackish Wa-ter Marl Bedrock Vertical Electrical Sounding (SEV) Electrical Tomography (ETR)

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