title: Vertical variation in the amplitude of the seasonal isotopic content of rainfall as a tool to jointly estimate the groundwater recharge zone and transit times in the Ordesa and Monte Perdido National Park aquifer system, north-eastern Spain.
abstract: The time series of stable water isotope composition relative to meteorological stations and springs located in the high mountainous zone of the Ordesa and Monte Perdido National Park are analyzed in order to study how the seasonal isotopic content of precipitation propagates through the hydrogeological system in terms of the aquifer recharge zone elevation and transit time. The amplitude of the seasonal isotopic composition of precipitation and the mean isotopic content in rainfall vary along a vertical transect, with altitudinal slopes for δ18O of 0.9‰/km for seasonal amplitude and -2.2‰/km for isotopic content. The main recharge zone elevation for the sampled springs is between 1950 and 2600m·a.s.l. The water transit time for the sampled springs ranges from 1.1 to 4.5yr, with an average value of 1.85yr and a standard deviation of 0.8yr. The hydrological system tends to behave as a mixing reservoir.
authors: Groundwater Hydrology Group, Dept. Civil and Environmental Eng., Technical University of Catalonia (UPC), Hydromodel Host S.L. and Aquageo Proyectos S.L., Spain. Electronic address: jorge.jodar@hydromodelhost.com.
authors: Jorge
authors: J
authors: Jódar
authors: Groundwater Hydrology Group, Dept. Civil and Environmental Eng., Technical University of Catalonia (UPC), Royal Academy of Sciences of Spain, Spain.
authors: Emilio
authors: E
authors: Custodio
authors: Geological Institute of Spain (IGME), Spain.
authors: Luis Javier
authors: LJ
authors: Lambán
authors: Geological Institute of Spain (IGME), Spain.
authors: Sergio
authors: S
authors: Martos-Rosillo
authors: Universidad Católica del Norte, Antofagasta, Chile.
authors: Christian
authors: C
authors: Herrera-Lameli
authors: Departamento del Agua, Centro Universitario Región Litoral Norte, Universidad de la República del Uruguay, Salto, Uruguay.
authors: Gonzalo
authors: G
authors: Sapriza-Azuri
keywords: Alpine hydrology; Karst hydrology; Parque Nacional Ordesa y Monte Perdido; Recharge; Seasonal isotopic amplitude; Transit time; Water isotopes