Caracterização estrutural em top-down de aquíferos fraturados: exemplo em Barra Mansa, Rio de Janeiro
Fractured crystalline aquifers are of significant importance in Brazil for public and private water supply, especially in the most populated and economically relevant regions, which justifies the need to further advance their knowledge. In general, however, the most appropriate techniques and tools...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | Brasil |
| Recursos: | Associação Brasileira de Águas Subterrâneas |
| Repositorio: | Águas Subterrâneas (São Paulo. Online) |
| Idioma: | portugués |
| OAI Identifier: | oai:ojs.aguassubterraneas.abas.org:article/30063 |
| Acesso em linha: | https://aguassubterraneas.abas.org/asubterraneas/article/view/30063 |
| Access Level: | acceso abierto |
| Palavra-chave: | Fractured Aquifer Lineaments Structural Characterization Resistivity Profile Conceptual Site Model. Aquífero Fraturado Lineamentos Caracterização Estrutural Caminhamento Elétrico Modelo Conceitual. |
| Resumo: | Fractured crystalline aquifers are of significant importance in Brazil for public and private water supply, especially in the most populated and economically relevant regions, which justifies the need to further advance their knowledge. In general, however, the most appropriate techniques and tools for the study and investigation of this geological environment are still little employed, both for the tasks of new wells location and for predicting the behavior of contaminants in situations of contaminated sites. In this study, it is intended to draw awareness to the joint application of conventional techniques for the development of a geological conceptual model in a contaminated area of a fractured aquifer, whose results could support the later advanced stages of investigations. The methodology integrates three traditional and non-invasive techniques, with scales of investigation developing from regional to local (top-down): (1) lineament analysis; (2) structural sampling in outcrops; and (3) geophysical survey imaging, using the 2D resistivity profile method. In the case studied, the three techniques generated progressively consistent results for a better characterization of the aquifer, enabling the identification of structural trends and the main groups of fractures in the region. Thus, the identified lineaments kept an excellent correlation with the structural trends identified in the field; similarly, low resistivity zones identified with the geophysical survey coincided with the location of the lineaments and fracture zones. The correlation between the three steps was essential for a better understanding of the flow dynamics of the aquifer, establishing, at a local scale, the geological-structural conceptual model and the structures that have the greatest potential for water flow and potentially for contaminant transport. |
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