The potential use of geophysical methods to identify cavities, sinkholes and pathways for water infiltration
The use of geophysical characterization of karst systems can provide an economical and non-invasive alternative for extracting information about cavities, sinkholes, pathways for water infiltration as well as the degree of karstification of underlying carbonate rocks. In the present study, three...
| Main Authors: | Hussain, Yawar, Uagoda, Rogério Elias Soares, Borges, Welitom Rodrigues, Nunes, José Gustavo da Silva, Hamza, Omar, Condori, Cristobal, Aslam, Khurram, Dou, Jie, Cárdenas-Soto, Martín |
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| Format: | Artigo |
| Language: | Português |
| Published: |
MDPI
2021
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| Subjects: | |
| Online Access: |
https://repositorio.unb.br/handle/10482/41176 https://doi.org/10.3390/w12082289 https://orcid.org/0000-0002-4155-6764 https://orcid.org/0000-0002-9448-1313 https://orcid.org/0000-0002-5158-1947 https://orcid.org/0000-0002-6184-4085 https://orcid.org/0000-0002-5048-0423 https://orcid.org/0000-0001-5930-199X https://orcid.org/0000-0002-6586-469X |
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| Summary: |
The use of geophysical characterization of karst systems can provide an economical and
non-invasive alternative for extracting information about cavities, sinkholes, pathways for water
infiltration as well as the degree of karstification of underlying carbonate rocks. In the present
study, three geophysical techniques, namely, Ground Penetrating Radar (GPR), Electrical Resistivity
Tomography (ERT) and Very Low Frequency Electromagnetic (VLFEM) methods were applied at
three different locations in relation to fluvial karst, which is listed as an environmentally sensitive area
in Rio Vermelho, Mambaí, Goiás, Brazil. In the data acquisition phase, the GPR, direct-current (DC)
resistivity and VLFEM profiles were obtained at the three locations in the area. Data were analyzed
using commonly adopted processing workflows. The GPR results showed a well-defined lithology of
the site based on the amplitude of the signal and radar typologies. On the other hand, the inverted
resistivity cross-sections showed a three-layered stratigraphy, pathways of water infiltration and
the weathered structures in carbonate (Bambui group). The interpretation of VLFEM as contours of
current density resulted from Fraser and Karous–Hjelt filters, indicated the presence of conductive
structures (high apparent current density) that might be linked to the weathered carbonate and
other conductive and resistive anomalies associated with the water-filled and dry cavities (cave),
respectively. The results encourage the integrated application of geophysical techniques such as the
reconnaissance for further detailed characterization of the karst areas. |
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