THE STABLE ISOTOPES IN THE HYDROLOGY STUDIES AT RAURENI-VALCEA AREA

D. Costinel¹ , V. V. Grecu², S. Cuna³, R. Vremera¹ and I. Faurescu¹

¹National R&D Institute for Cryogenics and Isotopic Technologies – ICIT Rm. Valcea, Research & Development Department, Uzinei Street, nr. 4, OP Raureni CP 7, Rm. Valcea ROMANIA, 240050, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; ²University Bucharest - Faculty of Physics, Department of Atomic and Nuclear Physics, Bucharest-ROMANIA
³National Institute for Research and Development of Isotopic and Molecular Technologies Cluj Napoca, str. Donath 71-103, cod 400293, CP 700, Cluj Napoca-ROMANIA

ABSTRACT
 
The hydrology and the climate studies are now and will continue to be joined by human activities. Observing differences of the stable isotopic concentration ratios informs us about certain geochemical or hydrological processes that took place. The isotopic composition of oxygen and hydrogen in rainwater varies with latitude, altitude, climate and time of the year. This methodology is an important tool in studying groundwater movement or freshwater origin.
 This study demonstrated the utility of the Continuous Flow – Isotope Ratio Mass Spectrometry method for measuring natural variation of the occurring isotopes of hydrogen (2H) and oxygen (18O) in meteoric waters. We continue until now (September 2009) the last work were we measured the variation of δ18O and δ2D values from precipitation fallen in Raureni-Valcea area between May-December 2007 and September 2008-March, together with the δ18O and  δ2D values from the Bistrita river (Costinel D. et al, 2009). For this area was reported the local Meteoric Water Line and the variation of δ18O and δ2D values was correlated with the temperature and humidity in the same period.