Comparative application of two methods (COP and PaPRIKa) for groundwater vulnerability mapping in Mediterranean karst aquifers (France and Spain) |
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Authors: | A I Marín N Dörfliger B Andreo |
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Institution: | 1.Centre of Hydrogeology, Department of Geology,University of Málaga (CEHIUMA),Málaga,Spain;2.Water Division,BRGM,Orléans Cedex 02,France |
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Abstract: | A comparative test of two vulnerability mapping methods (COP and PaPRIKa) specifically dedicated to for karst aquifers was
carried out on two Mediterranean carbonate aquifers. The vulnerability maps obtained for each aquifer present important differences.
To identify and determine the origin of these differences, the results were statistically analyzed using sensitivity analysis,
coefficients of determination and scatter graphs. In addition, the global vulnerability (Gv) parameter was used to measure
the general vulnerability of the aquifer and to compare the results obtained. This statistical analysis led us to conclude
that the main cause of differences between these two methods used to assess aquifer vulnerability lie in the relative importance
of the parameters employed in calculating the vulnerability index. For the PaPRIKa method, the variable related to infiltration
(slope and karst features) has the most influence, with less weight being assigned to the protective capacity of layers overlying
the aquifer. For the COP method, the most influent variable is defined by the layers overlying the aquifer, together with
infiltration characteristics, determined by the relative importance of different forms of infiltration in each aquifer. The
vulnerability mappings performed using the COP method present greater coherence with the known hydrogeological behavior of
the study areas, especially the Spanish aquifers. Nevertheless, further hydrogeological investigations are needed, such as
ones to validate the obtained vulnerability maps. |
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Keywords: | |
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