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Insight into the Katari-Lago Menor Basin aquifer, Lake Titicaca-Bolivia, inferred from geophysical (TDEM), hydrogeological and geochemical data

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doi: 10.1016/j.jsames.2019.102479
Authors:Flores Avilés, Gabriela Patricia; Descloitres, Marc; Duwig, Céline; Rossier, Yvan; Spadini, Lorenzo; Legchenko, Anatoly; Soruco, Álvaro; Argollo, Jaime; Pérez, Mayra; Medinaceli, Waldo
Author Affiliations:Primary:
Univ. Grenoble Alpes, CNRS, IRD, Grenoble-INP, Institute of Engineering, Univ. Grenoble Alpes, IGE, Grenoble, France
Other:
Ministerio de Educación Estado Plurinacional de Bolivia (Ministry of Education, MINEDU), La Paz, Bolivia
University Mayor of San Andrés (UMSA), La Paz, Bolivia
Ministerio de Medio Ambiente y Agua (Ministry of Environment and Water of Bolivia), La Paz, Bolivia
Volume Title:Journal of South American Earth Sciences
Source:Journal of South American Earth Sciences, Vol.99. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 0895-9811
Publication Date:2020
Note:In English
Summary: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.
Record ID:878631-2
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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