The hard rock aquifer in semiarid: analysis of models based on geological-structural data and airborne and terrestrial geophysical methods
In a large area of NE Brazil, where the effects of the semi-arid climate and crystalline terrain overlap, hard rock aquifers are the only sources of water, especially in periods of prolonged drought. The traditional location of wells, based on geological-structural, geomorphological and remote senso...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | Brasil |
| Institución: | Associação Brasileira de Águas Subterrâneas |
| Repositorio: | Águas Subterrâneas (São Paulo. Online) |
| Idioma: | portugués |
| OAI Identifier: | oai:ojs.aguassubterraneas.abas.org:article/30197 |
| Acceso en línea: | https://aguassubterraneas.abas.org/asubterraneas/article/view/30197 |
| Access Level: | acceso abierto |
| Palabra clave: | Groundwater Hard rock aquifer Structural geology Airborne and terrestrial geophysics Semiarid. Água subterrânea Meio fissural Geologia estrutural Geofísicas aeroportada e terrestre Semiárido |
| Sumario: | In a large area of NE Brazil, where the effects of the semi-arid climate and crystalline terrain overlap, hard rock aquifers are the only sources of water, especially in periods of prolonged drought. The traditional location of wells, based on geological-structural, geomorphological and remote sensor product analyses, involves high exploratory risk, resulting in about 30 to 40% of failure. This stems from the difficulty of assessing which are the dominant discontinuities (fracture or foliation), as well as which have higher hydrogeological potential. In this research, data from airborne (electromagnetic and magnetic) and terrestrial (geoelectric) geophysical surveys were integrated, in addition to structural analysis with a neotectonic bias. With the aim of improving the work of well locating, the results obtained demonstrate that the riacho-fenda and eluvial-alluvial trough models commonly coexist, allowing to outline their spatial distributions. In addition, it was possible to identify important geological and geophysical aspects to discriminate in the field which model effectively occurs. |
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