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Conceptual model of a semi-arid coastal aquifer using hydrogeochemical seasonal variation and isotopic fingerprints in Tamoios, Rio de Janeiro, Brazil
The present study focuses on the Tamoios aquifer (Rio de Janeiro State, Brazil), which is under pressure due to receiving a significant volume of urban runoff and sewage. The objective was based on a number of hydrogeochemical and isotope data to assess the aquifer functioning and establishing a con...
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| Published in: | Environmental monitoring and assessment 2023-03, Vol.195 (3), p.361-361, Article 361 |
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| creator | Sabino, Hullysses Silva, Gerson C. Costa, Vladimir E. Menezes, Juliana |
| description | The present study focuses on the Tamoios aquifer (Rio de Janeiro State, Brazil), which is under pressure due to receiving a significant volume of urban runoff and sewage. The objective was based on a number of hydrogeochemical and isotope data to assess the aquifer functioning and establishing a conceptual model to evaluate the hydrogeochemical processes. The database consisted of groundwater samples (
n
= 20) and surface water samples (fluvial, lagoon, and seawater) (
n
= 4), analyzed for major and trace constituents plus
18
O and
2
H isotopes. Results demonstrate that most of the groundwater samples were classified as sodium-chloride type in the rainy season and magnesium-chloride type in the dry season. Ion ratios indicated the ion sources and chemical behavior. Groundwater remained with a relatively high salt content throughout the seasons, particularly in the samples from the southern portion of the aquifer. PHREEQC software simulations exposed dolomite and calcite in mostly undersaturated condition and halite subsaturated throughout the year. Hydrogeochemical behavior indicated the salt content in the groundwater was not related to a hypothetical saltwater intrusion and revealed a steady state condition for the groundwater interface. Groundwater samples have a similar isotopic signature and were likely influenced by evaporative effects, indicating a role for the existing ponds in aquifer recharge. Strong free surface evaporation effects, evapotranspiration, and drainage processes in the floodplains probably enhanced the high ionic concentration in the groundwater environment. |
| doi_str_mv | 10.1007/s10661-023-10913-7 |
| format | article |
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n
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n
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18
O and
2
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n
= 20) and surface water samples (fluvial, lagoon, and seawater) (
n
= 4), analyzed for major and trace constituents plus
18
O and
2
H isotopes. Results demonstrate that most of the groundwater samples were classified as sodium-chloride type in the rainy season and magnesium-chloride type in the dry season. Ion ratios indicated the ion sources and chemical behavior. Groundwater remained with a relatively high salt content throughout the seasons, particularly in the samples from the southern portion of the aquifer. PHREEQC software simulations exposed dolomite and calcite in mostly undersaturated condition and halite subsaturated throughout the year. Hydrogeochemical behavior indicated the salt content in the groundwater was not related to a hypothetical saltwater intrusion and revealed a steady state condition for the groundwater interface. Groundwater samples have a similar isotopic signature and were likely influenced by evaporative effects, indicating a role for the existing ponds in aquifer recharge. Strong free surface evaporation effects, evapotranspiration, and drainage processes in the floodplains probably enhanced the high ionic concentration in the groundwater environment.</description><subject>Aquifer recharge</subject><subject>Aquifers</subject><subject>Atmospheric Protection/Air Quality Control/Air Pollution</subject><subject>Brazil</subject><subject>Calcite</subject><subject>Chemical analysis</subject><subject>Chemical behavior</subject><subject>Chlorides</subject><subject>Coastal aquifers</subject><subject>Dolomite</subject><subject>Dolostone</subject><subject>Dry season</subject><subject>Earth and Environmental Science</subject><subject>Ecology</subject><subject>Ecotoxicology</subject><subject>Environment</subject><subject>Environmental Management</subject><subject>Environmental monitoring</subject><subject>Environmental Monitoring - methods</subject><subject>Environmental science</subject><subject>Evaporation</subject><subject>Evaporation effects</subject><subject>Evapotranspiration</subject><subject>Evapotranspiration processes</subject><subject>Floodplains</subject><subject>Free surfaces</subject><subject>Groundwater</subject><subject>Groundwater - 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The objective was based on a number of hydrogeochemical and isotope data to assess the aquifer functioning and establishing a conceptual model to evaluate the hydrogeochemical processes. The database consisted of groundwater samples (
n
= 20) and surface water samples (fluvial, lagoon, and seawater) (
n
= 4), analyzed for major and trace constituents plus
18
O and
2
H isotopes. Results demonstrate that most of the groundwater samples were classified as sodium-chloride type in the rainy season and magnesium-chloride type in the dry season. Ion ratios indicated the ion sources and chemical behavior. Groundwater remained with a relatively high salt content throughout the seasons, particularly in the samples from the southern portion of the aquifer. PHREEQC software simulations exposed dolomite and calcite in mostly undersaturated condition and halite subsaturated throughout the year. Hydrogeochemical behavior indicated the salt content in the groundwater was not related to a hypothetical saltwater intrusion and revealed a steady state condition for the groundwater interface. Groundwater samples have a similar isotopic signature and were likely influenced by evaporative effects, indicating a role for the existing ponds in aquifer recharge. Strong free surface evaporation effects, evapotranspiration, and drainage processes in the floodplains probably enhanced the high ionic concentration in the groundwater environment.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><pmid>36735073</pmid><doi>10.1007/s10661-023-10913-7</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0003-3889-7514</orcidid><orcidid>https://orcid.org/0000-0002-3200-9507</orcidid><orcidid>https://orcid.org/0000-0002-7160-0893</orcidid></addata></record> |
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| ispartof | Environmental monitoring and assessment, 2023-03, Vol.195 (3), p.361-361, Article 361 |
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| source | ABI/INFORM Global; Springer Nature:Jisc Collections:Springer Nature Read and Publish 2023-2025: Springer Reading List |
| subjects | Aquifer recharge Aquifers Atmospheric Protection/Air Quality Control/Air Pollution Brazil Calcite Chemical analysis Chemical behavior Chlorides Coastal aquifers Dolomite Dolostone Dry season Earth and Environmental Science Ecology Ecotoxicology Environment Environmental Management Environmental monitoring Environmental Monitoring - methods Environmental science Evaporation Evaporation effects Evapotranspiration Evapotranspiration processes Floodplains Free surfaces Groundwater Groundwater - chemistry Groundwater data Groundwater recharge Halite Hydrogeochemistry Ion sources Isotopes Lagoons Magnesium Monitoring/Environmental Analysis Rainy season Saline water Saline water intrusion Salt content Salt water intrusion Saltwater intrusion Seasonal variation Seasonal variations Seasons Seawater Sewage Sodium Sodium Chloride Surface water Urban runoff Water analysis Water Pollutants, Chemical - analysis Water sampling Wet season |
| title | Conceptual model of a semi-arid coastal aquifer using hydrogeochemical seasonal variation and isotopic fingerprints in Tamoios, Rio de Janeiro, Brazil |
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