Identification for a Favorable Area of Groundwater Exploitation Based on Structural and Geoelectrical Data in Fractured Aquifer in Southern Brazil
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| Format: | Artículo científico |
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Universidad Nacional Autónoma de México
2022
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| _version_ | 1876477665892892672 |
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| author | César Augusto Moreira |
| author_facet | César Augusto Moreira |
| contents | Identification for a Favorable Area of Groundwater Exploitation Based on Structural and Geoelectrical Data in Fractured Aquifer in Southern Brazil César Augusto Moreira Lívia Portes Innocenti Helene Ciencias de la Tierra 3D modeling Fractured aquifer structural analysis electrical resistivity tomography The inherent structural complexity of fractured aquifers, which controls the groundwater accumulation and flow in restricted zones, can lead to a high number of non-productive tube wells. The combined analysis of geomorphological features and indirect investigations like geophysics methods allows the identification of favorable targets for groundwater exploitation. This paper deals with regional and local structural surveys coupled with electrical resistivity tomography data in order to identify favorable targets for groundwater exploitation for urban consumption in a fractured granite located in Caçapava do Sul city, southern Brazil. The structural control is manifested in the regional landforms and clearly conditions the orientation of main drainages. Based on this structural control, four parallel electrical resistivity tomography lines were performed in an area of interest for groundwater exploitation, followed by the generation of 2D inversion models and pseudo 3D models. The contact between the very thin superficial soil and the underlying granite massif determines the existence of a regional free aquifer and the probable recharge of the fractured aquifer. In the 2D inversion models, abrupt variations of resistivity related to locally recognized vertical fractures in the field occur, although they do not show lateral continuity (out of plane). The analysis of the geophysical maps from 40 meters depth allows the recognition of three alignments of low resistivity (around 500 Ωm) within a granite context where high values predominate (above 15000 Ωm). These alignments show a triple fracture intersection pattern also recognized in satellite images, which are highly favorable for groundwater accumulation and exploitation. 2022 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56875429002 https://www.redalyc.org/journal/568/56875429002/ https://www.redalyc.org/journal/568/56875429002/html/ https://www.redalyc.org/journal/568/56875429002/56875429002.epub https://www.redalyc.org/journal/568/56875429002/movil https://doi.org/10.22201/igeof.00l67l69p.2022.6l.4.2045 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.61 |
| format | Artículo científico |
| id | redalyc_56875429002 |
| institution | Redalyc |
| language | en |
| publishDate | 2022 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Identification for a Favorable Area of Groundwater Exploitation Based on Structural and Geoelectrical Data in Fractured Aquifer in Southern Brazil César Augusto Moreira Ciencias de la Tierra 3D modeling Fractured aquifer structural analysis electrical resistivity tomography Identification for a Favorable Area of Groundwater Exploitation Based on Structural and Geoelectrical Data in Fractured Aquifer in Southern Brazil César Augusto Moreira Lívia Portes Innocenti Helene Ciencias de la Tierra 3D modeling Fractured aquifer structural analysis electrical resistivity tomography The inherent structural complexity of fractured aquifers, which controls the groundwater accumulation and flow in restricted zones, can lead to a high number of non-productive tube wells. The combined analysis of geomorphological features and indirect investigations like geophysics methods allows the identification of favorable targets for groundwater exploitation. This paper deals with regional and local structural surveys coupled with electrical resistivity tomography data in order to identify favorable targets for groundwater exploitation for urban consumption in a fractured granite located in Caçapava do Sul city, southern Brazil. The structural control is manifested in the regional landforms and clearly conditions the orientation of main drainages. Based on this structural control, four parallel electrical resistivity tomography lines were performed in an area of interest for groundwater exploitation, followed by the generation of 2D inversion models and pseudo 3D models. The contact between the very thin superficial soil and the underlying granite massif determines the existence of a regional free aquifer and the probable recharge of the fractured aquifer. In the 2D inversion models, abrupt variations of resistivity related to locally recognized vertical fractures in the field occur, although they do not show lateral continuity (out of plane). The analysis of the geophysical maps from 40 meters depth allows the recognition of three alignments of low resistivity (around 500 Ωm) within a granite context where high values predominate (above 15000 Ωm). These alignments show a triple fracture intersection pattern also recognized in satellite images, which are highly favorable for groundwater accumulation and exploitation. 2022 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56875429002 https://www.redalyc.org/journal/568/56875429002/ https://www.redalyc.org/journal/568/56875429002/html/ https://www.redalyc.org/journal/568/56875429002/56875429002.epub https://www.redalyc.org/journal/568/56875429002/movil https://doi.org/10.22201/igeof.00l67l69p.2022.6l.4.2045 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.61 |
| title | Identification for a Favorable Area of Groundwater Exploitation Based on Structural and Geoelectrical Data in Fractured Aquifer in Southern Brazil |
| topic | Ciencias de la Tierra 3D modeling Fractured aquifer structural analysis electrical resistivity tomography |
| url | https://www.redalyc.org/articulo.oa?id=56875429002 https://www.redalyc.org/journal/568/56875429002/ https://www.redalyc.org/journal/568/56875429002/html/ https://www.redalyc.org/journal/568/56875429002/56875429002.epub https://www.redalyc.org/journal/568/56875429002/movil https://doi.org/10.22201/igeof.00l67l69p.2022.6l.4.2045 |