title: Hydrochemical and isotopes studies in a hypersaline wetland to define the hydrogeological conceptual model: Fuente de Piedra Lake (Malaga, Spain).
abstract: The Fuente de Piedra lake is a hypersaline wetland of great extension (13.5km2) and rich in aquatic birds and other species. It became therefore the third Spanish wetland to be included in the Ramsar convention and has been a "nature reserve" since 1984. The lake has an endorheic basin (150km2) with variable-density flows dominated by complex hydrogeological conditions. The traditional conceptualization of endorheic basins in semiarid climates considered that the brine in this hydric system was exclusively of evaporative origin and was placed only in the lake and its surrounding discharge area in the basin. Previous geophysical and hydrochemical studies identified different types of waters and brines. In this work, natural tracers (Cl-, Br-, Na+, Mg2+) and environmental isotopes (18O,2H,14C,13C and3H) were employed to a) discriminate different types of brines according to their degree of evaporation and genesis, and b) to estimate residence times of brine waters and identify recharge areas of the different flow subsystems. A conceptual model of the hydrogeological system of the lake basin and its links to a regional karst system is proposed.
authors: Instituto Geológico y Minero de España, C/Ríos Rosas, 23, 28003 Madrid, Spain; ETSI de Minas de Madrid, Universidad Politécnica de Madrid, C/Ríos Rosas, 21, 28003 Madrid, Spain; Universidad Estatal Península de Santa Elena UPSE, Facultad de Ciencias de la Ingeniería, Avda. principal La Libertad, Ecuador. Electronic address: fmontalvan@upse.edu.ec.
authors: F J
authors: FJ
authors: Montalván
authors: Instituto Geológico y Minero de España, C/Ríos Rosas, 23, 28003 Madrid, Spain. Electronic address: j.heredia@igme.es.
authors: J
authors: J
authors: Heredia
authors: Instituto Geológico y Minero de España, C/Ríos Rosas, 23, 28003 Madrid, Spain. Electronic address: jm.ruiz@igme.es.
authors: J M
authors: JM
authors: Ruiz
authors: Instituto Geológico y Minero de España, C/Ríos Rosas, 23, 28003 Madrid, Spain. Electronic address: e.pardo@igme.es.
authors: E
authors: E
authors: Pardo-Igúzquiza
authors: Instituto Geológico y Minero de España, C/Ríos Rosas, 23, 28003 Madrid, Spain. Electronic address: agddomingo@yahoo.es.
authors: A
authors: A
authors: García de Domingo
authors: ETSI de Minas de Madrid, Universidad Politécnica de Madrid, C/Ríos Rosas, 21, 28003 Madrid, Spain. Electronic address: franciscojavier.elorza@upm.es.
authors: F J
authors: FJ
authors: Elorza
keywords: Conceptual model; Environmental isotopes; Fuente de Piedra Lake (Spain); Variable density; Wetland