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Hydrodynamisme dans les aquifères de socle cristallin et cristallophyllien du Sud-Ouest de la Côte d'Ivoire : cas du département de Soubré : apports de la télédétection, de la géomorphologie et de l'hydrogéochimie

Abstract : Remote sensing, geomorphology, and hydrogeochemistry methods were used to characterize the ground water flow in this part of the Sassandra River watershed that lies in the Southwest of Ivory Coast. The distribution of the spacing between the lineaments obeys a process of Poisson which allowed estimating that 17 % of lineaments of size inferior to 2.1 km were not mapped. This network of lineaments has been analysed in order to obtain a statistical characterisation of the geometry of the aquifer blocs in the bedrock. This approach allowed studying the hydrodynamism to the local scale. The groundwater is mainly of type Ca-HCO3 or Na-HCO3. The conditions of the groundwater storage and circulation in the bedrock are studied here by using major ions. The calcic water, little or moderately mineralized is ensued from some zones of the watershed where the recharge is quite fast through some preferential paths. The sodic water is largely located at the downstream of the watershed, where the water infiltration strongly evaporated, and the cations exchange are the prevailing phenomena. The altitudes of the grounds spreading out from 70 to 210 m, with some punctual peaks of 450 m in places, and some slopes ranging from 2 to 4%. The regolith thickness pointed out a control by the lithology, and a layer less thick in the main stream's channel valleys. From borehole data and the water level in the hydrographical network, we show that the hydrogeological watershed is a subdued version of the hydrological watershed at a depth of 10 m with some variations.
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Submitted on : Tuesday, February 1, 2011 - 4:05:23 PM
Last modification on : Saturday, February 8, 2020 - 12:10:04 PM

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Koffi Théodore Yao. Hydrodynamisme dans les aquifères de socle cristallin et cristallophyllien du Sud-Ouest de la Côte d'Ivoire : cas du département de Soubré : apports de la télédétection, de la géomorphologie et de l'hydrogéochimie. Océan, Atmosphère. Conservatoire national des arts et metiers - CNAM; Université de Cocody - Côte d'Ivoire, 2009. Français. ⟨NNT : 2010CNAM0734⟩. ⟨tel-00561648⟩

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