Saline waters in the coastal area of the national park of Doñana (SW of Spain) in absence of saline water intrusion.
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SponsorsThe present work is inside the project MADRE (CICYT HID7-0321-002-02), carried out jointly by the Autonomous University of Madrid and the Technical University of Catalonia, Barcelona (Spain), with the support of the Geological Survey of Spain (IGME), Madrid. It is an extension of former CICYT projects in Doñana (PB 87-0842, AMB 92-636, AMB 95-0372). Also it is part of the background studies to the European project BASELINE (Natural Baseline Quality in European Aquifers, EUK1-CT1999- 0006). The authors are indebted Prof. C. Montes (leader of the MADRE project), and to C. Mediavilla IGME Project Office in Sevilla) and to the CHG (Guadalquivir River Basin Authority) for the support in the fieldwork.
PublisherHydrology & Ecology Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology
Bibliographic CitationLOZANO, Edurne, COLETO, Carmen, MANZANO, Marisol, CUSTODIO, Emilio. Saline waters in the coastal area of the national park of Doñana (SW of Spain) in absence of saline water intrusion. En: Salt Water Intrusion Meeting (17th: 2002: Delft, The Netherlands). Proceedings SWIM17, Delft 2002: Proceedings 17th Salt Water Intrusion Meeting, Delft 6-10 May 2002. Delft: Hydrology & Ecology Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology. 2002. 238-249p. ISBN 90-800089-8-2
Lago Santa Olalla
Wetlands in dune complexes in Doñana National Park are strongly influenced by groundwater. Hydrochemical studies have been performed to know the relationships between the small lakes existing at the inner side of the coastal dune belt and the aquifer, which is formed mainly by fine to medium silica sands. The aim of this work is to show the existence of brackish and saline waters in a coastal area with lakes in absence of marine water intrusion. These saline waters form in small lakes by evaporation, and affect the chemical and isotopic composition of the surrounding groundwaters. The mean electrical conductivity (EC) of unaffected groundwater (2 - 45 m depth) in the study area is around 0.25 mS/cm. It is of the Na-Cl type, and reflects mostly the local rain, including airborne marine salts incorporation into recharge water through dry deposition. The water of the small lakes present a wide range of EC, from 0.2 to 28 mS/cm, and are mainly of the Na-Cl type, but can be changed ...
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