CHARACTERIZATION OF GROUNDWATER-SURFACE WATER MIXING PROCESSES USING ENVIRONMENTAL ISOTOPES AND GEOCHEMICAL MODELS

BECHER QUINODOZ, F. N; BLARASIN, M. T; PANARELLO, H.O.

Viena

Simposio; International Symposium on Isotope Hydrology: Revisiting Foundations and Exploring Frontiers - CN225; 2015

International Atomic Energy Agency

Abstract: The aim of this work is to characterize the hydraulic/geochemical relationshipsbetween surface water and groundwater in the Quinto river basin (Cordoba province). Theaquifer-river hydraulic relationships were effluent/influent, varying in space basically as aresult of geomorphology. d2H and d18O isotopic values show that surface water andgroundwater samples coincide in a mixing line, presenting different evaporation degrees. The isotopic results and geochemical numerical model show that in summer and winter, the water quality of Quinto River may be explained by mixing processes between surface water, greatly influenced by Chañares dam, and local, intermediate and/or regional groundwater flow. In summer, the surface water component (72%) predominates while in winter groundwater prevails (82%).