L’identification des contrles hydrogéologiques sur les écoulements, la réalimentation et la salinisation est fréquemmement critique pour la gestion des faibles ressources en eau souterraine des zones arides. Une des approches pour identifier ces mécanismes consiste à combiner l’analyse des données hydrogéologiques et hydrochimiques pour développer un modèle conceptuel exhaustif sur un bassin hydrogéologique. Afin de mettre en application cette technique, des échantillons d’eau ont été prélevés sur 33 sondages permettant une discrimination verticale, dans l’aquifère de Hueco Bolson, dans la région texane de Trans Pecos, qui constitue la ressource principale pour El Paso (Texas, Etats Unis) et Jurez (Mexique). Plusieurs traceurs géochimiques ont été analysés, et les données ont été étudiées sur la base des connaissances hydrogéologiques du bassin. Les données de 2H et 18O ont permis d’identifier deux sources d’alimentation régionales : une première sur les contreforts des montagnes de l’ouest, et une seconde par drainance à travers l’aquifère adjacent de Tularosa. Les concentrations en chlorures étaient étroitement corrélées à la lithologie, et les rapports Cl/Br et 36Cl ont suggéré que la source primaire des ions chlorures est la dissolution de la halite dans une unité lithologique spécifique. Par contre, les isotopes du soufre ont indiqué que la majorité des sulfates proviennent du gypse du Bassin permien de Tularosa. Ces résultats conduisent à un modèle conceptuel plus exhaustif, qui suggère que la salinisation chlorurée des puits résulte d’un flux d’eau ascendant depuis la formation de Fort Hancock.
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