Groundwater management of a highly dynamic karst by assessing baseflow and quickflow with a rainfall-discharge model (Dardennes springs, SE France)
Journal Article
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· Bulletin de la Societe Geologique de France
- Aix-Marseille Univ., Aix-en-Provence (France)
- Univ. of Avignon (France)
- Association Spélé-H2O, Six-Fours (France)
- Aix-Marseille Univ., Aix-en-Provence (France); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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. In such a dynamic aquifer, part of the water budget cannot be accounted for by water resources as fast flow is not stored within the aquifer and is not available for the drinking water demand. The results were compared with the current groundwater management to determine whether the withdrawal is sustainable. Depending on whether it is a wet or a dry year, the proportion of slow flow ranges from 27 to 61% of the total discharge, respectively. During floods in high water periods, the proportion of quickflow increases drastically up to more than 90% of the spring discharge. In the case of a 300 mm/d simulated Mediterranean rainfall event, the mean daily peak value may reach 74 m3/s. This discharge can be reduced if the aquifer is previously depleted, which increases the storage within the aquifer. Coupling the geological context and the model results opens up future perspectives for the active management of the karst aquifer.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Aix-Marseille Univ. (France); USDOE
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1480778
- Journal Information:
- Bulletin de la Societe Geologique de France, Journal Name: Bulletin de la Societe Geologique de France Journal Issue: 6 Vol. 188; ISSN 0037-9409
- Country of Publication:
- United States
- Language:
- English
Links between karst hydrogeological properties and statistical characteristics of spring discharge time series: a theoretical study
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journal | August 2020 |
SNO KARST: A French Network of Observatories for the Multidisciplinary Study of Critical Zone Processes in Karst Watersheds and Aquifers
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journal | January 2018 |
Dynamics of the Flow Exchanges between Matrix and Conduits in Karstified Watersheds at Multiple Temporal Scales
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