IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Isotopes tracing the water cycle in the Pampeano aquifer at the Southeast of Buenos Aires Province, Argentina.
Autor/es:
MARTÍNEZ D.E; QUIROZ LONDOÑO, M.; BOCANEGRA, E.M.; MASSONE H.E.; DAPEÑA, C.
Lugar:
Mónaco
Reunión:
Simposio; International Symposium on Isotope Hydrology, Marine Ecosystems and Climate Change Studies.; 2013
Institución organizadora:
International Atomic Energy Agency
Resumen:
A sedimentary sequence of loess-like Quaternary deposits, from few meters to about 100 m thick, covers about 1,500,000 km2 in the Argentine Pampas. These deposits, named Pampeano sediments, constitute the main groundwater resource for the sustainability of the agricultural production in Argentina. An isotope hydrology survey was carried out on a 10,000 km2 catchment covered by these sediments in order to improve the understanding of the hydrological cycle. Since 2005, stable isotopes (2H, 18O) are being determined on: a) rainwater collected at three points in the basin; b) stream water continuously sampled weekly at three points in the main river; and c) groundwater samples. Furthermore 3H concentration was determined on near 50 samples. Results show seasonal effect in precipitation and the weighted average values as characteristics recharge water. Groundwater is homogenous in isotope composition indicating a dispersive flow model. Dominance of baseflow in streamflow composition is another of the conclusions of the study.