148 A new concept of karst development based on hydrogeology and geophysics Conclusion and interpretation of pathways in karst horizons In addition to the flow log results, the tracer tests provide further clarification of mass transfers within the boreholes, in relation to the porous and karstic levels intersected between 35 m and 115 m, as defined by geophysical and GFTC logs (Tab. 1). The results are presented in Figures 20 and 21. The tracer responses indicate ascending flows in M02 and M12, and descending flows in M21 (Fig. 20). The boreholes drilled on the experimental site thus act as conduits connecting the karst levels and appear to be solely responsible for the Figure 20 Hydrogeological cross-section from M19 to MP6. Figure 21 Hydrogeological cross-section from M05 to MP6.
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