88 A new concept of karst development based on hydrogeology and geophysics In 2014, the acoustic tool was rerun in boreholes C1, MP5, MP6, MP7, M03, M05, M11, M13, M14, M20, and M22. In 2015, VSP with hydrophones was recorded in boreholes C1, M03, M04, M07, M11, M20, MP6, and MP7. In each borehole, in addition to VSP recording, ambient noise measurements were done. Boreholes M11, M14, M20, and M22 were selected for seismic and stratigraphic characterization of karstogenic horizons (Gaillard et al., 2024). The chapter presents an overview of the field experiments conducted using mainly seismic and acoustic methods and shows their relative contribution to the understanding of the experimental site. Boreholes C1 and M20 are selected to illustrate the VSP method. Boreholes C1, M11, M14, M20, and M22 are selected to illustrate the acoustic method. Figure 1 The hydrological experimental site and borehole locations. Boreholes C1, M11, M14, M20, and M22 (indicated by red circles) were selected for seismic and stratigraphic characterization of karstogenic horizons.
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