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Bragado Vila Pouca De Aguiar – Portugal Bragado Vila Pouca de Aguiar – Portugal 1 Table of Contents Bragado ................................................................................................................................................... 1 1. Description of the test case ............................................................................................................. 6 1.1. Description of the water bodies related to the HPP ............................................................... 6 1.1.1. Hydrology of the Avelames river ..................................................................................... 7 1.1.1. Main pressures ................................................................................................................ 7 1.2. Presentation of the HPP .......................................................................................................... 8 1.2.1 Location of the HPP ................................................................................................................ 8 1.2.1. Eflow .............................................................................................................................. 10 1.2.2. Upstream or downstream migration devices ................................................................ 11 1.2.3. Hydropeaking ................................................................................................................ 11 2. Objectives for this test case .......................................................................................................... 12 3. Presentation and results of activities in FIThydro. ........................................................................ 13 3.1. Fish community of the Tâmega River basin .......................................................................... 13 3.1.1. Introduction ................................................................................................................... 13 3.1.2. Methodology ................................................................................................................. 13 3.1.3. Results ........................................................................................................................... 14 3.1.4. Discussion ...................................................................................................................... 18 3.2. Fish and habitat analysis ....................................................................................................... 19 3.2.1. Methodology ................................................................................................................. 19 3.2.2. Results ........................................................................................................................... 20 3.2.2.1. Hydrology .............................................................................................................. 20 3.2.2.2. Fish populations .................................................................................................... 22 3.2.2.3. Habitat analysis ..................................................................................................... 23 3.3. Hydropeaking ........................................................................................................................ 25 3.3.1. Methodology ................................................................................................................. 25 3.3.1.1. Characterization of hydropeaking ......................................................................... 25 3.3.1.2. Fish habitat use ...................................................................................................... 26 3.3.1.3. Macroinvebrate assemblages ................................................................................ 27 3.3.2. Results ........................................................................................................................... 27 3.3.2.1. Characterization of Hydropeaking ......................................................................... 27 3.3.2.2. Fish location ........................................................................................................... 35 2 3.3.2.3. Macroinvertebrates ............................................................................................... 39 4. References ..................................................................................................................................... 42 3 List of figures Figure 1 – Location of Avelames River in the North of Portugal. ............................................................ 6 Figure 2 - Summary of additional information regarding status of implementation of the WFD. Green color - water body in good ecological state; yellow color - water body in moderate ecological state; orange color - water body in poor ecological state; blue color - water body in high ecological state. .. 6 Figure 3 - Mean monthly discharge downstream Bragado HPP (2010-2016) ......................................... 7 Figure 4 – Location of Bragado HPP and Bragado weir ........................................................................... 8 Figure 5 - Bragado HPP scheme............................................................................................................. 10 Figure 6 – At the left bank, ecological flow release at the Bragado weir ............................................. 11 Figure 7 - Places with fish assemblage data in the Tâmega River basin (presence-absence, depicted by a blue circle). ......................................................................................................................................... 14 Figure 8 - Distribution of Pseudochondrostoma duriense in the Tâmega River basin. Sampling site with species presence is denoted by a green circle, whereas sampling sites with absence are denoted by a blue circle. The species occur in the Avelames River. ........................................................................... 15 Figure 9 - Distribution of Squalius carolitertii in the Tâmega River basin. Sampling site with species presence is denoted by a green circle, whereas sampling sites with absence are denoted by a blue circle. The species occur in the Avelames River. ................................................................................... 16 Figure 10 - Distribution of Luciobarbus bocagei in the Tâmega River basin. Sampling site with species presence is denoted by a green circle, whereas sampling sites with absence are denoted by a blue circle. ..................................................................................................................................................... 16 Figure 11 - Distribution of Salmo trutta fario in the Tâmega River basin. Sampling site with species presence is denoted by a green circle, whereas sampling sites with absence are denoted by a blue circle. ..................................................................................................................................................... 17 Figure 12 - Distribution of Lepomis gibbosus in the Tâmega River basin. Sampling site with species presence is denoted by a green circle, whereas sampling sites with absence are denoted by a blue circle. ..................................................................................................................................................... 17 Figure 13 - Factor 1 and 2 of the PCA performed on the matrix of presence-absence of fish species in 55 electrofishing surveys made throughout the Tâmega River basin. Eigenvalues were 3.52 and 1.77, respectively, for the first and second factor. ........................................................................................ 18 Figure 14 – Bragado HPP scheme. Localization of Bragado weir, Bragado HPP and the key-section... 20 Figure 15 - Mean monthly real and simulated turbined flows during 20010/11 until 2015/16. .......... 21 Figure 16 – Mean monthly flows at Bragado HPP scheme. .................................................................. 22 Figure 17 – Fish survey at Bragado ; a) upstream Bragado weir ; b) downstream Bragado HPP ......... 22 Figure 18 – Topography survey in the river reach downstream Bragado HPP ..................................... 23 Figure 19 – River bed topography at the upstream river reach. ........................................................... 24 Figure 20 - River bed topography at the downstream river reach. ....................................................... 25 Figure 21 – Flow series from October 1st 2010 to September 30th 2016 at the key-section downstream Bragado HPP..................................................................................................................... 27 Figure 22 – Number of rapid increases (Ninc) and decreases (Ndec) per year for the Avelames River downstream Bragado HPP..................................................................................................................... 30 Figure 23 – Thigh and Tlow along the 6 years flow series ......................................................................... 31 Figure 24 – Cumulative distribution of time span after a rapid increase and after a rapid decrease. 32 Figure 25 – Number of rapid increases and rapid decreases per day. .................................................. 33 Figure 26 – Number of rapid increases and rapid decreases during the day........................................ 33 4 Figure 27 - Percentage of rapid increases and decreases
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