Calculation of groundwater storage in the northern dune chain of the Villarino district from electrical resistivity tomographies
Keywords:
hydrology, groundwater, geoelectric, sand dunes, storageAbstract
In the northern sector of the Villarino district, in the southwest of the province of Buenos Aires, there is a chain of continental dunes. This chain of sands contains a phreatic aquifer, which carries water of good physicochemical quality and is the only source of water supply for the populations of the area. The present work aims to estimate the volume of groundwater storage in this aquifer, using electrical resistivity tomography (TRE), defining the saturated thickness of interest. Using this methodology, seven tomographies were carried out in different portions of the chain of sand dunes. The interpretation of the resulting images made it possible to identify the resistivity intervals correlated with the hydrogeological characteristics of the dune chain and the thickness saturated with fresh water in each area, in order to subsequently calculate the volume of groundwater storage in each sector. As a result, thicknesses of interest greater than those obtained in previous measurements were observed, thus calculating a volume of groundwater storage of 344 Hm3. This is considered the most appropriate estimate according to the available data. The methodology applied is of great use for the hydrogeological knowledge of the subsoil and provides data of interest for a more accurate calculation of groundwater storage, which is of great importance for the management and rational and sustainable exploitation of groundwater.
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Copyright (c) 2023 Matías Rey, Andrés G. Ruffo , Juan Manuel Giorgi, E. René Albouy, Lucia Carrica , Nerea Bastianelli
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