Nutrient sources and dynamics in a mediterranean fluvial regime (Ebro River, NE Spain) and their implications for water management
2005
Torrecilla, N.J. | Galve, J.P. | Zaera, L.G. | Retamar, J.F. | Alvarez, Ana María
Nonpoint source and point source nutrient loads (N, PO4-P, COD) to the Ebro River in its central sector were estimated using hydrogeological and socioeconomical data. Their impacts on eutrophication and nutrient dynamics in the river were analyzed through a review of the public administration's historical data and the interpretation of two sampling profiles in September 02 (low flows season) and April 03 (high flows season). A marked seasonality was found in nutrient concentrations, nutrient loads and eutrophication indicators (O2, Turbidity), appearing symptoms of eutrophication during the summer related to both NPS and PS Nutrient loads within the study area. Agricultural NPS account for 64% of NO3 loads generated within the study area while urban and industrial PS are responsible of 88% PO4-P and 71% COD loads. Biological reactions within the river ecosystem (including denitrification in the most eutrophic branches) were found to be a key factor in nutrient content and dynamics. Improvements in urban and industrial wastewater treatment facilities, land use planning and restoration of river-side wetlands, seem to be adequate policies for the improvement of the nutrient water quality in the studied sector of the Ebro River. Flow and temperature seasonality related to Mediterranean fluvial regime imposes significant limitations to nutrient PS in order to accomplish the combined approach proposed in European Water Framework Directive (WFD), based upon Emission Limit Values (ELV) and Environmental Quality Standards (EQS).
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