Application of environmental isotopes techniques to selected hydrological Pampean Systems. Argentina

DAPEÑA, CRISTINA; PANARELLO, HECTOR

Advances in Isotope Hydrology and its role in Sustainable Water Resorces Management.

International Atomic Energy Agency

Lugar: Vienna; Año: 2007; p. 251 - 260

The isotopic composition of precipitation in Buenos Aires station is of great importance to understand the interpretation of the hydrological Pampean Systems.  The rain isotope content (2H, 18O y 3H) is being recorded since 1978 at Ciudad Universitaria Station, which belongs to the Red Nacional de Colectores de Argentina and Global Network for Isotopes in Precipitation (IAEA-WMO).  The annual weighted average of Buenos Aires isotopic composition is d18O= -5,5?, d2H=-30? and the local meteoric water line ranges from d2H =8d18O+12?; to d2H =8d18O+14?.  These data are used like input function to local hydrologic systems.  The 3H concentration varies between 0 and 17,7 TU; nevertheless, values high as 40 TU were also measured, responding to the spring peak.  At present, higher values were found, probably due to non-natural causes.  The isotope techniques were used to investigate several regions from Buenos Aires province.  Relevant applications of environmental isotopes techniques to selected areas in the Pampean region are presented