Resumen de Consideraciones sobre la evolución hidrogeoquímica de las aguas superficiales en el río Andarax (Almería)
Francisco Sánchez Martos, Antonio Pulido Bosch, Ángela Vallejos Izquierdo, Juan Gisbert, Ángel Fernández-Cortés
The Andarax river is located in the Southeast of Spain and is characterized by the variability of its flow, which is dependent upon the rainfall regime of the area. Its catchement area display a very diverse lithology and is characterized by a highly complex tectonics. This paper presents a study of the chemical composition of the surface waters of the Andarax river over an annual cycle. The relationship between ground water and surface waters using a hydrogeochemical methodology is analysed. The ground water-surface water interactions were found to be more intense in two areas:to the North of Al mocita and at North of Santa Fe. North of Almócita local discharges of good quality water arise, which leads to the chemical stabilization of the surface water. In this stretch, electrical conductivity, temperature and ion concentrations are constant, and lower than at adjacent sampling points. At North of Santa Fe a contrasting effect is observed with an increase in salinity and seasonal variability. Concentrations of chloride and sulphate become elevated, and there is amarked increase in salinity, especially during low flow periods when the majority of the surface flow derives from groundwater drainage.
