141 7. Hydrogeological flow logging and dye tracer tests on the Hydrogeological Experimental Site 7 (84–88 m), and 10 (114–116 m). They are marked with an asterisk (*) in Table 1. The level that is both the most karstified and the most productive is level 7 (86–88 m). The lithology of this interval corresponds to a dolomitized limestone. The comparison between M21 and M22 provides additional insights. For instance, the karst levels identified by Mari and Porel (2008; 2024) at 100 m (M20) and at 90 m and 110 m (M22) yield only limited water inflows. The lithology of these intervals consists of limestone containing numerous type 1 vacuoles (Gaillard and Moreau, 2026), which appear to be poorly interconnected. Moreover, in M22, the level at 90 m seems to result from the collapse of a dolomitized horizon during drilling. Table 1 Locating water inflows into the Supra Toarcian aquifer using temperature and flow logs (in m depth) inflow M05 MP06B M11 M12 M19 M20 M21 M22 1 32-34 2 55 3 64-66* 4 72-76 77-78 72-74* 5 82-84 78-80 80-82 6 7 86-88* 88-90 86-88* 84-86* 8 92 90-92* 91-94 9 98-100 10 110-120 116-118 114-116 Flow in m3/h 10.6 10.0 10.8 9.8 10.0 10.4 10.1 10.2 Flow logging with pumping in MP6 (crossed dynamics MP6) Flow logs were carried out on boreholes M02, M05, M12, M19, and M21 with pumping in borehole MP6 at 60 m³/h. The borehole logs were carried out upwards, at a speed of 6 m/min. Vertical flow velocities are measured, and the velocity derivative is calculated to identify the incoming and outgoing flows from the different karst levels. When velocities decrease, flows in the borehole are downward. Conversely, when velocities increase, flows are upward. According to the flow log results, upward flows are identified on M02 (Fig. 11) and M12 (Fig. 12), and downward flows are observed on M05 (Fig. 13) and M21 (Fig. 15). Flow directions are uncertain regarding M19 (Fig. 14).
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