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Erschienen in: Environmental Earth Sciences 2/2014

01.01.2014 | Thematic Issue

In situ monitoring of karst springs in Wallonia (southern Belgium)

verfasst von: Philippe Meus, Pierre Moureaux, Sébastien Gailliez, Jérémy Flament, Francis Delloye, Philippe Nix

Erschienen in: Environmental Earth Sciences | Ausgabe 2/2014

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Abstract

The implementation of the Water Framework Directive, as well as the forthcoming entry into force of other European water policies focusing on water resources, require a thorough reorganization of groundwater resources monitoring in most European countries. In Wallonia, monitoring programs were initiated in 2005 to control the quantitative and chemical statuses of groundwater bodies, as well as the effectiveness of management plans aimed at achieving environmental objectives. In karst aquifers, springs are preferential monitoring targets even if, as a result of the high heterogeneity of this type of aquifer, the interpretation of time series and spatial data remains a challenge. Since 2006, a “springs” monitoring network has been progressively set up in the southern part of Belgium. Currently, in situ measurements of discharge, temperature, conductivity, turbidity and fluorescence of water are conducted at nine karstic outlets in the Devonian and the Carboniferous limestone aquifers of Wallonia. The main objective of this ongoing research is to evaluate the suitability and the robustness of such standard measurements to discriminate anthropogenic impacts from natural variations, at both short- and long-term scales. Discharge and temperature data revealed being useful in the assessment of regional hydro-climatic trends. Groundwater proved to be a better natural filter for the assessment of long-term climatic changes than mathematical filtering of noisy surface signals. Investigations of such data at a European scale could therefore give additional insight into the impacts of climate change on groundwater resources. Conductivity, turbidity and fluorescence data characterize the particulate, mineral and organic health of water and a better understanding of their natural dynamics could help in the early detection of anthropogenic deviations. However, the current reproducibility of these measurements is too low to ascertain observed trends and fluctuations, and further research is still needed.

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Fußnoten
1
Data loggers are TRMC models from Tétraèdre company.
 
2
ISCO 2150 and SonTek Argonaut SL-3000 instruments are used for velocity-stage measurements.
 
3
It is the case for GGUN-FL30 and In Situ Troll devices used in this study.
 
4
Dissolved Organic Matter.
 
5
Meteorological station of the PAMESEB network.
 
6
Station of the Public Service of Wallonia network.
 
7
These data were validated by a second probe installed since 2010.
 
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Metadaten
Titel
In situ monitoring of karst springs in Wallonia (southern Belgium)
verfasst von
Philippe Meus
Pierre Moureaux
Sébastien Gailliez
Jérémy Flament
Francis Delloye
Philippe Nix
Publikationsdatum
01.01.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Environmental Earth Sciences / Ausgabe 2/2014
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI
https://doi.org/10.1007/s12665-013-2760-x

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