Water storage and transfer in the epikarst of karstic systems during high flow periods

Citation

Material Information

Title:
Water storage and transfer in the epikarst of karstic systems during high flow periods
Series Title:
Journal of Hydrology
Creator:
Aquilina, L.
Ladouche, B.
Dörfliger, N.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Karst ( local )
Epikarst ( local )
Recharge Processes ( local )
High Discharge Event ( local )
Oxygen Isotopes ( local )
Hydrogen Isotopes ( local )
Mass Balance ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
A monitoring of spring and rain waters in the South of France during two hydrological cycles is presented. Rain waters were sampled after each precipitation event at 3 rain-gauge stations. Four karstic springs located in the same area have also been daily (high discharge events) to monthly (low flow periods) sampled. This paper focuses on compositional changes in the Cl− and Br− ions and the oxygen-18 (δ18O) and hydrogen (δD) isotopes during the high discharge events. The responses of the different karstic systems are quite homogeneous and reflect the hydrological state of the system. The waters discharged during the major autumn and winter high discharge events originate from the epikarstic reservoir and show characteristics chemical variations related to residence in the unsaturated zone close to the surface. Their residence time in the order of 1–3 months. Correlations between the composition of the spring-water and the rainwater during three successive high discharge events during the summer of 1998 indicate that the water for high discharge event “n” is derived from water from precipitation event “n − 1” via a piston-type mechanism with residence time of 2 weeks. These results are interpreted as an indication of the major role of the epikarst reservoir in the karst recharge functioning. The similar behaviour of the four springs, although located in different geological contexts allows to think that the epikarst role could be more important than previously thought.
Original Version:
Journal of Hydrology, Vol. 327, no. 3-4 (2006-08-20).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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