INGEIS   05370
INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
capítulos de libros
Título:
ANÁLISIS HIDROQUÍMICO E ISOTÓPICO DE LA CUENCA DEL RÍO ATUEL, ARGENTINA
Autor/es:
DORNES, PABLO; DAPEÑA, CRISTINA; MARIÑO, EDUARDO; SCHULZ, CARLOS J.
Libro:
Procesos Geoquímicos Superficiales en Iberoamérica
Editorial:
N ueva Graficesa, S.L.
Referencias:
Lugar: Salamanca; Año: 2014; p. 149 - 164
Resumen:
The Atuel River basin, Argentina, extends across contrasting environments and weather conditions, from the main ridge to the west in the upper basin, to semi-desert plains in the lower basin. The river has a snowmelt regime with an allochthonous nature in the middle and lower basins. The development of irrigated areas changed the flow regime in the lower basin affecting the interaction between surface and groundwater. The objective is to characterize these processes using hydro-chemical and isotopic methods. The hydrochemical characteristics of both surface and groundwater showed spatial homogeneity with a dominance of sulphate-calcium type and with the occurrence of dilution/concentration processes due to the intermittency of runoff in the lower basin. The isotopic composition of the river was very impoverished denoting its snow and glacier ablation origin. The composition had a progressive enrichment to the lower basin. Both analyzes showed the existence of evaporative concentration processes and infers the existence of additional sources of sodium and equilibrium conditions with calcite. The results illustrated a gaining behavior of the Atuel River in the upper and middle basin and a variable hydrological nature in space and time in the lower basin due to the intermittency of runoff. These influent/effluent interactions are limited to a narrow strip along the river