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Title (Primary) Groundwater sources in a permeable coastal barrier: evidence from stable isotopes
Author Schmidt, A.; Santos, I.R.; Burnett, W.C.; Niencheski, F.; Knöller, K.;
Journal Journal of Hydrology
Year 2011
Department ANA; CATHYD;
Volume 406
Issue 1-2
Language englisch;
Keywords Stable isotopes; Geochemical tracers; Permeable sediments; Hydrologic cycle; Submarine groundwater discharge; Subterranean estuaries
Abstract
This paper presents isotopic composition (δ18O, δ2H) of groundwater, lagoon water, and seawater collected in a coastal lagoon system in Southern Brazil as a tool to define groundwater sources within a permeable barrier that separates the lagoon from the ocean. The isotopic signature of the barrier groundwater differs both from the isotopic composition of lagoon water and seawater. The groundwater is significantly lighter, indicating that the major recharge source to the barrier is precipitation, rather than lagoon water. In the southern and central part of the barrier no interaction of groundwater with lagoon water was observed. In the northern part, however, lagoon water intrusion into the barrier was identified. This effect is apparently caused by different vegetation types on the barrier influencing subsurface hydrological processes. The central and the southern areas are characterised by natural dune vegetation (high infiltration, low evapotranspiration rates) whereas the northern part is covered by extensive pine tree plantations (low infiltration, high evapotranspiration rates). The presence of pine trees may enhance lagoon and seawater intrusion into the shallow aquifer and decrease fresh submarine groundwater discharge.
ID 11424
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=11424
Schmidt, A., Santos, I.R., Burnett, W.C., Niencheski, F., Knöller, K. (2011):
Groundwater sources in a permeable coastal barrier: evidence from stable isotopes
J. Hydrol. 406 (1-2), 66 - 72