Caracterización hidroquímica de las aguas superficiales y subterráneas en la cuenca del Oja-Tirón. Procesos de contaminación
A large hidrochemical characterization of the superficial and underground waters has been carried out in the Oja-Tiron basin (La Rioja-Castilla and León, Spain), a territory where the intensive irrigated agriculture is the land's principal use. A net of 28 wells has been established, located in the alluvial aquifers of the Oja and the Tirón, as well as 10 river stations, in the Oja, Tirón and Zamaca rivers. A total of 11 sampling campaigns with seasonal frecuency has been carried out from 2003 to 2005. In the middle and lower zones of the Tiron aquifer and the North West side of the Oja aquifer the waters present elevated hardness and a calcium sulphate composition, as a consequence of the lithological surroundings with gypsum and loamy facies. In the rest of the Oja aquifer, the composition is mixed and calcium bicarbonated. The existence of a problem of diffuse pollution of the water resources was observed as a consequence of nitrate leaching from agricultural fertilizers in large zones of the Oja and Tiron aquifers. Also, high levels of hexavalent chromium have been detected in some points of the Oja aquifer and the wastewater effluent of Santurde, where a tannery is located whose wastes could produce a human health risk due to the high mobility and toxicity of the hexavalent chromium. © Asociación Ibérica de Limnología.
| Main Authors: | , , |
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| Format: | artículo biblioteca |
| Published: |
Asociación Ibérica de Limnología
2007
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| Subjects: | Water resources, Alluvial aquifers, Intensive agriculture, Water supply, Diffuse pollution, Nitrate, Hexavalent chromium, Recursos hídricos, Acuíferos aluviales, Agricultura intensiva, Abastecimiento de agua, Contaminación difusa, Nitrato, Cromo hexavalente, |
| Online Access: | http://hdl.handle.net/10261/269258 http://dx.doi.org/10.13039/501100007273 http://dx.doi.org/10.13039/501100000780 |
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| Summary: | A large hidrochemical characterization of the superficial and underground waters has been carried out in the Oja-Tiron basin (La Rioja-Castilla and León, Spain), a territory where the intensive irrigated agriculture is the land's principal use. A net of 28 wells has been established, located in the alluvial aquifers of the Oja and the Tirón, as well as 10 river stations, in the Oja, Tirón and Zamaca rivers. A total of 11 sampling campaigns with seasonal frecuency has been carried out from 2003 to 2005. In the middle and lower zones of the Tiron aquifer and the North West side of the Oja aquifer the waters present elevated hardness and a calcium sulphate composition, as a consequence of the lithological surroundings with gypsum and loamy facies. In the rest of the Oja aquifer, the composition is mixed and calcium bicarbonated. The existence of a problem of diffuse pollution of the water resources was observed as a consequence of nitrate leaching from agricultural fertilizers in large zones of the Oja and Tiron aquifers. Also, high levels of hexavalent chromium have been detected in some points of the Oja aquifer and the wastewater effluent of Santurde, where a tannery is located whose wastes could produce a human health risk due to the high mobility and toxicity of the hexavalent chromium. © Asociación Ibérica de Limnología. |
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