Aviles G. P. F. auteur aut IRD Descloitres Marc auteur aut IRD Duwig Céline auteur aut IRD Rossier Y. auteur aut IRD Spadini L. auteur aut IRD Legchenko Anatoli auteur aut IRD Soruco A. auteur aut IRD Argollo J. auteur aut IRD Perez M. auteur aut IRD Medinaceli W. auteur aut IRD text journalArticle eng text/pdf born digital access The increasing demand for water and irrigation in the semi-arid Bolivian Altiplano requires a better knowledge of the available resources, particularly groundwater. The aim of this study is to provide a first insight into the hydrogeological structure (0-200 m deep) and groundwater dynamics of the Katari-Lago Menor Basin aquifer located between the Eastern Cordillera and Lake Titicaca, Bolivia. This aquifer is studied using geophysical data (a total of 187 Time Domain Electromagnetic (TDEM) soundings), piezometric data (97 groundwater level measurements) and geochemical data (52 groundwater samples), combined with geological, lithological and topographical information. The results allowed identifying stratigraphic models consistent with the Quaternary sediments being hydraulically connected and behaving as a single regional basin-aquifer. This basin-aquifer is delimited by the most ancient lake invasions towards the southern, western and northern sides and by the lower limit of rock glaciers towards the eastern side. A large portion of the aquifer presents an unconfined behaviour varying from 50 to 150 m while the confined portion varies from 100 to 150 m. Groundwater flow within the Katari and Lago Menor Basin aquifer is composed of several interconnected groundwater flow systems. The main groundwater flow system starts in the high mountain ranges of the Eastern Cordillera, follows the topographic Piedmont gradient (NE to SW) and discharges in a series of wetlands. This multidisciplinary approach proved to be an appropriate method to derive a consistent picture of the hydrogeological functioning of the Katari-Lago Menor Basin aquifer. specialized Katari-Lago Menor Basin aquifer Groundwater resources Time-domain electromagnetic soundings BOLIVIE ANDES TITICACA LAC KATARI BASSIN 062 064 066 99 art. 102479 [21 p.] 2020 0895-9811 https://www.documentation.ird.fr/hor/fdi:010079017 10.1016/j.jsames.2019.102479 0895-9811 [F B010079017] https://www.documentation.ird.fr/hor/fdi:010079017 https://www.documentation.ird.fr/intranet/publi/2020/05/010079017.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2020-06-09 2025-02-24 fdi:010079017 fre