10 A new concept of karst development based on hydrogeology and geophysics Jurassic lithology, combined with a diverse geophysical approach, made it possible to identify the karstic levels responsible for the rapid flows observed at the site. Throughout the nine chapters, readers are guided toward a coherent and wellsupported representation of the reservoir structure, where variations in carbonate chemistry (pure limestone vs dolomitized limestone) emerge as key drivers of karstification. Within the 100-meter-thick section under study, three horizontal productive levels have been clearly identified, representing priority targets for the sustainable extraction of groundwater resources. Pr. Gilles POREL Head of the hydrogeological experimental site at the University of Poitiers It is with genuine satisfaction that I have the privilege, less than a year after the publication of the AGAP notebook “Geophysics in Geothermal Exploration: a review”, to write the preface to this new work: “A New Concept of Karst Development Based on Hydrogeology and Geophysics.” Once again, the term “notebook” hardly does justice to the content, as this is far more than a simple collection of summaries. It is a work of undeniable scientific merit, enriched by clear and visually compelling figures of exceptional quality. I would like to extend my sincere congratulations to the authors of the nine chapters and express my gratitude to Jean-Luc Mari and Thierry Gaillard. Their respective expertise in geophysics and in the geology of the Poitou-Charente Threshold has ensured a vital coherence in a work that demands true multidisciplinary mastery. I am highly confident that this “notebook” will be well received by its readers— whether geologists, hydrogeologists, karstologists, geophysicists, or geoscientists in general. Michel HAYET President, AGAP Quality
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