Abstract
The fluorescent properties of dissolved organic matter (DOM) have been used as natural tracers in various water systems. However, only few studies have focused on groundwater systems, specifically, on karst systems. The aim of this study was to develop the use of the DOM fluorescence signal as a natural tracer, considering the multiple compartments of a karst system. This method was applied to the Lez hydrosystem, which supplies the city of Montpellier with drinking water. The hydrodynamics and hydrochemistry of the spring were monitored beginning March 2006. The DOM fluorescence was measured by the excitation–emission matrix spectroscopy technique. The analysis of the total fluorescence signal confirms the efficiency of this tool to trace rapid infiltration flows. Moreover, the decomposition of the signal into different fluorophores complements the information provided by the total signal. Indeed, the fluorescence emitted by the humic compounds seems to be the ideal tool for identifying rapid infiltration flows. Nevertheless, the fluorescence of protein-like compounds is better correlated with the inflow of faecal bacteria at the outlet. This decomposition of the fluorescence signal is an interesting way to provide information on both the rapid infiltration flow as well as the vulnerability of the karst aquifers.
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Abbreviations
- DOM:
-
Dissolved organic matter
- EEM:
-
Excitation–emission matrix
- EC:
-
Electrical conductivity
- TOC:
-
Total organic carbon
- HL:
-
Humic-like
- PL:
-
Protein-like
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Quiers, M., Batiot-Guilhe, C., Bicalho, C.C. et al. Characterisation of rapid infiltration flows and vulnerability in a karst aquifer using a decomposed fluorescence signal of dissolved organic matter. Environ Earth Sci 71, 553–561 (2014). https://doi.org/10.1007/s12665-013-2731-2
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DOI: https://doi.org/10.1007/s12665-013-2731-2