Groundwater Management of a Highly Dynamic Karst by Assessing Baseflow and Quickflow with a Rainfall-Discharge Model (Dardennes Springs, SE France)
Bull. Soc. géol. Fr. BSGF - Earth Sciences Bulletin 2017, 188, 40 © C. Baudement et al., Published by EDP Sciences 2017 https://doi.org/10.1051/bsgf/2017203 Available online at: www.bsgf.fr Groundwater management of a highly dynamic karst by assessing baseflow and quickflow with a rainfall-discharge model (Dardennes springs, SE France) Cécile Baudement1,*, Bruno Arfib1, Naomi Mazzilli2, Johan Jouves1, Thierry Lamarque3 and Yves Guglielmi1,4 1 Aix-Marseille Univ, CNRS, IRD, Coll France, CEREGE, Aix-en-Provence, France 2 Université d’Avignon et des Pays de Vaucluse À INRA, UMR1114 EMMAH, Avignon, France 3 Association Spélé-H2O, av. Bucarin, Six-Fours, France 4 Lawrence Berkeley National Laboratory, Berkeley, United States Abstract – This paper aims at characterizing the groundwater flow in a highly dynamic karst aquifer using a global modeling approach based on rainfall and spring discharge time series. The Dardennes aquifer (SE France) was studied as it is used for drinking water supply and it also produces karst flash floods that increase the flood hazard downstream in urban areas. Three years of data were available, including a normal rainy year, a wet year and a dry year. Modeling was performed with the new platform KarstMod, a rainfall- discharge model with calibration tools. The Dardennes aquifer model was structured with three interconnected reservoirs: Epikarst, Matrix, and Conduit. Using this modeling approach, we were able to determine the groundwater hydrograph separation of the karst spring discharge, at the annual scale and at the event scale (flood). This gives insight into the low flow (Matrix) available for the drinking water demand and the fast flow (Conduit) that generates flash floods.
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