A. Maqsoud (Canada), N. Crampon (France), and B. Bussière (Canada)
Chalk, Hydrochemistry, karst, Principal Components Analysis, frequency distribution curves
The chalk of the Paris basin is classically considered to be aquifer of double porosity. However, the existence of karstic phenomena in these aquifers, for a long time considered to be ignored, led to discovery of possible functions that could describe the karst. This is because the hydrochemistry of four springs was analyzed with two approaches. Principal Components Analysis (P.C.A) and Frequency Distribution Curves of Electrical Conductivity. The P.C.A results showed clearly the presence of water which quickly passed in transit through the chalk aquifer. This water is sub-saturated in bicarbonate and evacuated by the karstic drains. The results of F.D.W.C show that the underground drainage is really organised and, all of those aquifers are karstic. This study demonstrates that the karstic functioning is a reality in chalk aquifer and must be taken into account in the plans of exploitation and protection of their groundwater resources.
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