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Nutrient load concept- reservoir vs. bay impacts
Citation key fsiwdpcn15
Author Selge, F., Matta, E., Hinkelmann, R. & Gunkel, G.
Year 2015
Note Proceedings 17th IWA-DIPCON Conference, Berlin, Germany.
Abstract Large water bodies possess environmental gradients and monitoring programs are mostly adapted for cost and time effectiveness. Bay areas are often more isolated from the main water body and are likely to have unobserved different environmental processes and impacts. This study was performed at the Itaparica reservoir, São Francisco river, located in semi-arid Northeast Brazil, with dendritic form. Since water exchange of a bay is difficult to measure, flow and transport simulations were performed for bay water residence time estimation. The P-chlorophyll a relationship was used to develop the P use efficiency model for critical P load estimation of 25 µg P L-1. Phosphorus sources and input rates into a bay and the respective reservoir were calculated and compared regarding their different origins for the period after damming and for 2013. After impoundment, the P load highly exceeded the carrying capacity, because of leaching and mineralization processes. In 2013, P inputs were still above this threshold, whereas inflow and sub-basin P export during the rainy season were crucial. But eutrophication processes have increased in the bay relative to the main water body. Hence, water quality is mainly seasonally degraded leading to a need for watershed conservation measures to reduce eutrophication processes.
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