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Variabilidade da resposta hidroquímica a eventos de precipitação utilizando monitoramento de alta frequência em bacias hidrográficas subtropicais, sul do Brasil

2020; Volume: 17; Issue: 1 Linguagem: Inglês

10.21168/rega.v17e20

2359-1919

Gustavo Antônio Piazza, Rémi Dupas, Chantal Gascuel-Odoux, Adílson Pinheiro, Vander Kaufmann, Éverton Blainski,

Water Quality and Pollution Assessment

data was used to investigate storm responses in two subtropical catchments in the Brazilian Atlantic Forest.We measured discharge, turbidity and conductivity in a 30 km 2 subsurface-dominated catchment (2012)(2013) and in a 48 km 2 groundwater-dominated catchment (2014)(2015)(2016).Conductivity was dominated by elements associated with geochemical weathering or atmospheric deposition, but also nutrients such as nitrate.Turbidity was a proxy for suspended sediment.Results showed similar dominant storm event patterns in both catchments.The dominant pattern for turbidity was a positive C-Q relationship with clockwise hysteresis, suggesting a nearby source, while the dominant pattern for conductivity was a negative C-Q relationships with clockwise hysteresis, suggesting storage of solutes in deep groundwater and distant sources (hillside).The negative C-Q pattern for conductivity was stronger and the hysteresis wider in the groundwater-dominated catchment.Hydroclimatic controls were also similar between both catchments, but storm event patterns in the subsurface-dominated catchment were more strongly influenced by antecedent conditions (conditions before the event) that in the groundwater dominated catchment.