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Modélisation hydrologique du bassin versant de l'oued Rheraya et sa contribution à la recharge de la nappe du Haouz (bassin du Tensift, Maroc)

Abstract : Groundwater recharge is a little known parameter in the water balance. Knowledge of processes and accurate estimation of groundwater recharge is a prerequisite for effective and sustainable management of groundwater resources. In addition, groundwater recharge is considered the most direct parameter by which climate change affects the renewable groundwater resources. The present PhD thesis focuses on the recharge of the alluvial aquifer of the Haouz plain by the floods of the Rheraya wadi (intermittent river), which descends from the High-Atlas Mountains and crosses the southern plain towards the North. This work has two main objectives: (i) simulating the hydrological regime of the Rheraya River whose floods are at the origin of the groundwater recharge, and (ii) Quantifying the groundwater recharge by the floods of the Rheraya in the zone of the High-Atlas piedmont. The runoff modeling of the Rheraya wadi in the High-Atlas (225 km², elevations ranging between 1030 and 4165 m.a.s.l.) takes into account the snow component. For this purpose, the GR4J conceptual and global model was applied over the period 1989- 2009, coupled with the CemaNeige module for semi-distributed snow dynamics. The daily snow coverage simulated by CemaNeige is in good agreement with that extracted from the MODIS snow product in the period 2000-2009 (R² = 0,64). In addition, the simulated daily snow water equivalent is consistent with that measured at the weather station of Oukaimeden (2004-2006, R² = 0,81). Finally, the runoff simulation reproduces quite well the strong seasonal and inter-annual variability. In conclusion, the hydrological regime of the Rheraya wadi is pluvio-nival with an unimodal distribution whose maximum in April is linked with snowmelt. The study of groundwater recharge is carried out through the analysis of the monitoring of groundwater fluctuations in the streambed of the Rheraya wadi, over two hydrological cycles 2014-2015 and 2015-2016.[...]
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Youssef Hajhouji. Modélisation hydrologique du bassin versant de l'oued Rheraya et sa contribution à la recharge de la nappe du Haouz (bassin du Tensift, Maroc). Hydrologie. Université Paul Sabatier - Toulouse III, 2018. Français. ⟨NNT : 2018TOU30257⟩. ⟨tel-02328912⟩

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