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Fonctionnement hydrothermique de l'interface nappe-rivière du bassin des Avenelles

Abstract : The river-aquifer interactions are complex and play a preponderant role in hydrosystems functioning, in both qualitative and quantitative terms. These two compartments interact through various nested interfaces from the local scale in particular the river aquifer interface called the Hyporheic Zone (HZ) to the regional scale. The HZ acts as a buffer between the stream and the groundwater. The water and heat fluxes variation at this zone modulates the biogeochemical processes.The aim of this thesis, is to improve the understanding of the thermal and hydrological regime of the HZ and its spatial variation. This problem is approached by the use of high frequency measurement stations of river-aquifer exchanges (LOMOS) in the Avenelles basin (sub-basin of the Seine basin (46 km2)) and by modeling. The high frequency monitoring allowed to realize an analysis of the experimental data characterizing the hydroclimatic regime of the Avenelles basin as well as the spatial and temporal evolution of the hydrosystem various compartments functioning.A synthetic case was realized to characterize the main factors controlling the thermal regime at the river aquifer interface and the energy storage variation within the ZH. The modeling approach followed by the synthetic case provides an analysis framework of the five LOMOS data.The acquired LOMOS data were used to determine the hydrogeological and thermal properties of the HZ and of the underlying aquifers by inversion by means of a 2D finite element thermo-hydrogeological model (METIS) coupled with a parameters screening script to quantify water and heat fluxes through the stream – aquifer interface over along the stream network.The model results highlight the spatiotemporal variability of the heat exchanges at the five LOMOS. The quantification of heat fluxes provided a new lighting of the stream-aquifer interactions of the Avenelles basin.
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Submitted on : Wednesday, March 27, 2019 - 12:49:12 PM
Last modification on : Wednesday, November 17, 2021 - 12:31:32 PM
Long-term archiving on: : Friday, June 28, 2019 - 2:01:14 PM


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  • HAL Id : tel-02081163, version 1


Asma Berrhouma. Fonctionnement hydrothermique de l'interface nappe-rivière du bassin des Avenelles. Ingénierie de l'environnement. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEM034⟩. ⟨tel-02081163⟩



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