The hydrochemical facies and anomalous fluoride content in the Serra Geral aquifer system,southern Brazil: a GIS approach with tectonic and principal component analysis |
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| Authors: | Arthur Nanni Ari Roisenberg Maria Paula Casagrande Marimon Antonio Pedro Viero |
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| Affiliation: | 1.Rio Grande do Sul Environmental Agency,FEPAM/Universidade Federal do Rio Grande do Sul, UFRGS,Porto Alegre,Brazil;2.Universidade Federal do Rio Grande do Sul, UFRGS,Porto Alegre,Brazil;3.Universidade do Estado de Santa Catarina, UDESC-FAED,Florianópolis,Brazil;4.Universidade Federal do Rio Grande do Sul, UFRGS,Porto Alegre,Brazil |
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| Abstract: | Groundwater with high fluoride content and water mixture patterns were studied in Serra Geral aquifer system (SGAS) using three aspects, principal component analysis (PCA), tectonic scenery and hydrochemical interpretation from 309 groundwater chemical data information from deep wells. A four-component model is suggested and explains 81% of total variance in the PCA. Six hydrochemical facies were identified. These facies suggest two different fluoride sources. Tectonic approach shows the relationship between defined hydrochemical facies and regional fracture control. The applied methodology reveals a minimum level to understand hydrochemical mixtures. The fluoride enrichment mechanisms into the groundwater are comprised in advance to guide the future uses of SGAS to the public supply. |
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| Keywords: | Groundwater Geostatistics Tectonics Fluoride Geographic information systems |
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