Etude expérimentale et numérique du transfert hydrique dans la plaine de Sidi Bouzid

Abstract : The aim of this study is to set up a 3D regional model to quantify water flux in unsaturated-saturated zones and the role of floods on the recharge process. Therefore, numerical flow simulations were conducted using the finite element Feflow that will be validated by measured data. A conceptualization of input parameters was carried out to overcome the absence of measured data. The heterogeneity of the vadose zone have a significant impact on the variation of the vertical flow, the residence time and the propagation of wetting front in the unsaturated zone. The results obtained in 1D were then used to quantify groundwater recharge of the entire area of the study site. The original approach is to derive the time-dependent hydraulic boundary condition of water level at the soil surface of the spreading perimeters by measured flood hydrographs and to develop a limited conceptual model of water uptake by evaporation. The hydrodynamic model showed that the water balance is very important. Flow simulations have shown that the perimeter flooding approach overestimates the artificial recharge of the aquifer.
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Manel Boughanmi. Etude expérimentale et numérique du transfert hydrique dans la plaine de Sidi Bouzid. Sciences de la Terre. Université de Strasbourg; Université du Centre (Sousse, Tunisie), 2018. Français. ⟨NNT : 2018STRAH010⟩. ⟨tel-02143119⟩

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