Physicochemical and isotopic analysis of three springs of Guardal River sources (Sierra Seca, SE Spain)
DOI:
https://doi.org/10.55407/geogaceta104480Keywords:
karst aquifer, isotopes, piston effect, recharge elevation, water mixturesAbstract
Three springs discharge on the eastern slope of the Sierra Seca karst aquifer, which, despite being in the same environment, have different characteristics. Based on physicochemical and isotopic data, these characteristics are studied to highlight the differences between them. The one located at the highest elevation, Fuente Alta, has the highest average flow and less mineralized waters and is related to Lower Cretaceous carbonates. The one with the lowest flow, Fuente de Enmedio, is at the lowest elevation with less mineralized waters than the one with intermediate flow, La Natividad, despite the fact that both drain the same aquifer formed by Upper Cretaceous carbonates. In addition, its physicochemical and isotopic characteristics suggest that it drains mixtures of waters from the two Cretaceous aquifers. The Natividad drains the most mineralized waters and with heavier isotopic values, at the onset of floods due to the “piston effect”, which is not observed in the other two springs. The lightest isotopic values are observed in the two springs with the highest flow associated with an episode of sudden snowmelt. The data suggest that the surface of the recharge area outcrops at similar average elevations, although slightly higher in Fuente Alta.
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Copyright (c) 2024 Antonio González Ramón, Carmen Martín Ruiz, Antonio Lope Morales González, Jorge Jódar Bermudez, Francisco Moral Martos, Rosario Jiménez Espinosa
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