SWAT Literature Database for Peer-Reviewed Journal Articles

Title:An integrated analysis of the eutrophication process in the Enxoé Reservoir within the DPSIR framework 
Authors:Ramos, T.B., H. Darouich, M.C. Gonçalves, D. Brito, M.A.C. Branco, J.C. Martins, M.L. Fernandes, F.P. Pires, M. Morais and R. Neves 
Volume (Issue):10(11) 
Article ID:1576 
URL (non-DOI journals): 
Broad Application Category:hydrologic and pollutant 
Primary Application Category:nitrogen cycling/loss and transport 
Secondary Application Category:hydrologic assessment 
Watershed Description:60.8 km^2 Enxoé River, a tributary of the Guadiana River located in the Alentejo region in southern Portugal. 
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Abstract:The Enxoé reservoir in southern Portugal has been exhibiting the highest trophic state in the country since its early years of operation. The problem has attracted water managers’ and researchers’ attention as the reservoir is the water supply for two municipalities. Extensive research was thus conducted over the last few years, including field monitoring and modelling at the plot, catchment, and reservoir scales. This study now frames all partial findings within the Driver-Pressure-State-Impact-Response (DPSIR) framework to better understand the eutrophication process in the Enxoé reservoir. Agriculture and grazing were found to have a reduced role in the eutrophication of the reservoir, with annual sediment and nutrient loads being comparably smaller or similar to those reported for other Mediterranean catchments. Flash floods were the main mechanism for transporting particle elements to the reservoir, being in some cases able to carry up three times the average annual load. However, the main eutrophication mechanisms in the reservoir were P release from deposited sediment under anoxic conditions and the process of internal recycling of organic matter and nutrients. Reducing the P load from the catchment and deposited sediment could lead to a mesotrophic state level in the reservoir. However, this level would only be sustainable by limiting the P internal load ability to reach the photic zone. 
Keywords:catchment; eutrophication; modelling; nutrients; trophic level.