Abstract :
[en] The present study applies a geophysical approach to the Federal district of Brazil, a
challenging hydrogeologic setting that requires improved investigation to enhance groundwater
prospecting to meet the rising water demand. The geophysical characterization of a complex hardrock aquifer sub-system was conducted using direct current (DC) electrical resistivity tomography
(ERT) integrated with surface geological information. With a total of twenty-seven ERT profiles,
the resistivity acquisition was carried out using a dipole-dipole array of electrodes with an interelectrode spacing of 10 m. Based on resistivity ranges, the interpretation of the inverted resistivity
values indicated a ground profile consisting of upper dry soil, saprolite, weathered and fresh
bedrock. Along with this layered subsurface stratigraphy, the approach allowed us to map the
presence of significant hydrogeological features sharp contrasting anomalies that may suggest
structural controls separating high-resistivity (≥7000 Ω m) and low-resistivity (<7000 Ω m)
conducting zones in the uppermost 10 m of the ground. The assumed impacts of these features on
groundwater development are discussed in light of the Brasilia aquifer settings.
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