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L'aquifère carbonate karstique de Chekka (Liban) et ses exutoires sous-marins. Caractéristiques hydrogéologiques et fonctionnement.

Abstract : Studied for a long time, Chekka submarine springs in Lebanon are presented as being among the most important known undersea resources. Never questioned, the first estimates proposed an average flow of 6 m3/s, among them at least 2.5 m3/s for the main spring during low flow. New technologies developed in France to study submarine springs; their functioning and their aquifer were applied to these springs within the framework of a European project "MEDITATE". The main perennial spring was instrumented for monitoring its flow, salinity, temperature and pressure. First data indicate a minimum flow of approximately 60 l/s of brackish water during low flow. Its functioning is typically karstic, with wide variations of the flow, salinity and temperature of water. During low flow, high salinity is the consequence of sea water intrusion in karst conduits. Many water sites in the area, among them littoral and submarine springs were monitored for theit geochemical characteristics. The hydrogeological basin was delimited: the rivers Asfour and Jaouz undergo losses in their crossing of upper Cretaceous limestone, reaching, according to the season, several m3/s on the whole. Terms of the hydrological balance of spring recharge basin gave an average flow of fresh water 2.15 m3/s on the whole, in agreement with direct flow measurements during low flow. These first conclusions question the possibility of direct exploitation of these submarine springs. A permanent monitoring of the main submarine spring is required in a monitoring network of the whole aquifer to provide a sustainable exploitation of that important resource.
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Submitted on : Friday, November 6, 2009 - 10:56:36 AM
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Ahmad El Hajj. L'aquifère carbonate karstique de Chekka (Liban) et ses exutoires sous-marins. Caractéristiques hydrogéologiques et fonctionnement.. Sciences de la Terre. Université Saint-Joseph, Beyrouth, 2008. Français. ⟨tel-00430215⟩

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