Seasonal variations of the isotopic ratios for oxygen and deuterium in the groundwater of the Serra Geral Aquifer System
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ORIGINAL ARTICLE
Seasonal variations of the isotopic ratios for oxygen and deuterium in the groundwater of the Serra Geral Aquifer System in the northeast region of the state of Rio Grande do Sul, Brazil Taison Anderson Bortolin1 · Pedro Antonio Roehe Reginato2 · Franciéle Schwanck Carlos2 · Gustavo Barbosa Athayde3 · Marcos Imério Leão2 · Luis Henrique Mancini4 · Vania Elisabete Schneider1 Received: 7 June 2020 / Accepted: 14 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This paper presents the results of the monitoring of oxygen (18O) and deuterium (2H) isotopes in groundwater of the Serra Geral Aquifer System (SGAS) in the region of Carlos Barbosa, Rio Grande do Sul. Rainwater, and water from 12 tubular wells of the SGAS was collected monthly (from April to November). The results indicated that groundwater originates from meteoric water. For rainwater, values were found to be between -11.73 and -3.25‰V-SMOW for δ 18O and -61.56 and -8.63‰V-SMOW for δ2H. The air masses simulated by the HYSPLIT model revealed that retro-trajectories for depleted rainfall (d18O
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