INGEIS   05370
INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
capítulos de libros
Título:
ISOTOPES TRACING THE WATER CYCLE IN THE PAMPEANO AQUIFER AT THE SOUTHEAST OF BUENOS AIRES PROVINCE, ARGENTINA
Autor/es:
MARTINEZ, DANIEL E.; QUIROZ LONDOÑO, MAURICIO; BOCANEGRA, EMILIA; MASSONE, HECTOR; DAPEÑA, CRISTINA
Libro:
Isotopes in Hydrology, Marine Ecosystems and Climate Change Studies
Editorial:
INTERNATIONAL ATOMIC ENERGY AGENCY
Referencias:
Lugar: Vienna; Año: 2013; p. 177 - 183
Resumen:
A sedimentary sequence of loess-like Quaternary deposits, with a thickness ranging from a few metres to about 100 m, covers about 1 500 000 km2 in the Argentine Pampas. These deposits, named the Pampeano Sediments, constitute the main groundwater resource for the sustainability of agricultural production in Argentina. An isotope hydrology survey was carried out on a catchment area of about 10 000 km2 covered by these sediments in order to improve the understanding of the hydrological cycle. Since 2005, stable isotopes (2H, 18O) have been determined in: (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 in nearly 50 samples. Results show a seasonal effect in precipitation and the weighted average values as characteristic recharge water. A numerical low model using the code MODFLOW was developed simultaneously and the isotopic results used to validate it. Groundwater is homogenous in its isotope composition indicating a dispersive low model. Dominance of baselow in the streamlow composition is another conclusion of the study.