Recharge sources and hydraulic communication of karst aquifer, São Miguel watershed, MG, Brazil
| Autor: | Thiago Nogueira Lucon, Leonardo Brandão Nogueira, Paulo Galvão, Mariangela Garcia Praça Leite, Adivane Terezinha Costa, Thiago José Augusto Madeira |
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| Rok vydání: | 2020 |
| Předmět: |
Hydrology
010506 paleontology geography geography.geographical_feature_category Watershed Hydrogeology Sinkhole Geology Aquifer Groundwater recharge 010502 geochemistry & geophysics Karst 01 natural sciences Water resources Groundwater 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of South American Earth Sciences. 100:102591 |
| ISSN: | 0895-9811 |
| DOI: | 10.1016/j.jsames.2020.102591 |
| Popis: | The main public water supply in the Sao Miguel watershed (MG, Brazil) comes from a well-developed karst region, where information about hydraulic communications between caves entrances, sinkholes, recharge and discharge areas are still unknown. The study aims to identify regional hydrogeological processes describing groundwater hydrochemical evolution, interactions between meteoric, surface and ground waters, recharge and discharge sources, and possible hydraulic communications for proper management of water resources. Geophysical data were analyzed and water samples (meteoric, surface, and groundwater) throughout the watershed were collected for stable isotopes (18O and 2H) and major ions analyzes. Results indicated strong influences of regional geological structures in the karst water flow directions; high concentrations of major ions in the central region of the watershed are common; karstification processes and aquifer recharge are more active during the rainy season, while in the dry season the watershed is supplied by groundwater. |
| Databáze: | OpenAIRE |
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