The groundwater-surface water interaction in a costal lagoon: Lagoa da Conceição, Florianópolis/SC, Brazil

Abstract

The groundwater-surface water interaction (GW-SW) occurs in nearly all surface-water environments, such as rivers, lakes, lagoons and oceans. The reconnaissance of this process has grown rapidly. Recent studies in south Brazil have shown great influence of submarine groundwater discharge (SGD) in the Atlantic Ocean biogeochemical cycle. The study area is a choked coastal lagoon located in Santa Catarina Island, Brazil. In this study, seepage meters were used to identify and quantify GW-SW fluxes in the sediment-water interface. This methodology revealed satisfactory results of seepage fluxes patterns in five sampling stations. The results shown SGD rate from -12,0 to 6,0 cm/d. Conceptual modes were proposed for the GW-SW interaction in Lagoa da Conceição, which presumes that the use of water resources may directly affect seepage fluxes in the area.

Keywords

• Seepage meters. Descargas de águas subterrâneas (DAS). Lagunas costeiras.