Bragado test case - Revision history

Bendikhansen: /* Gallery */

2020-10-26T09:42:03Z

Gallery

Iboavida: /* Results */

2020-09-18T15:46:13Z

Results

Iboavida: /* Results */

2020-09-18T15:45:22Z

Results

Iboavida: /* E-flow */

2020-09-18T15:38:32Z

E-flow

Bendikhansen: /* Results */

2020-06-29T09:56:32Z

Results

Bendikhansen at 09:55, 29 June 2020

2020-06-29T09:55:18Z

Bendikhansen: /* Gallery */

2020-06-29T09:54:58Z

Gallery

Bendikhansen: /* Results */

2020-06-29T09:53:09Z

Results

António: /* Gallery */

2020-04-12T15:41:58Z

Gallery

António: /* Gallery */

2020-04-12T15:41:32Z

Gallery

@@ Line 73: / Line 73: @@
 =Gallery=
 <gallery mode=packed>
-bragado_weir.jpg|Weir.
+bragado_weir.jpg|Weir at the Bragado HPP.
 bragado_river-Avelames-downstream-the-powerhouse.jpg|Avelames River downstream of powerhouse tailrace.
 bragado_powerhouse-and-penstock.jpg|Penstock and powerhouse.

@@ Line 62: / Line 62: @@
 Fish assemblage community of the Avelames River is dominated by small sized native cyprinids, as it is typical of similar rivers in northern Portugal. Iberian chub (''Squalius carolitertii'') (mean total length (TL) 9.7 ± 1.8 cm; mean total weight (TW) 12.6 ± 9.6 g), calandino (''Squalius alburnoides'') (TL 9.9 ± 1.9 cm; TW 7.5 ± 1.0 g), and Iberian nase (''Pseudochondrostoma duriense'') (TL 9.9 ± 1.9 cm; TW 10.4 ± 7.0 g) were tagged downstream Bragado HPP with passive integrated transponders to assess their habitat use and movement behaviour in response to hydropeaking. The total detection rate was 59%. Fish were distributed along the river reach with high density upstream the water release. ''P. duriense'' tend to prefer higher depths and higher velocities when compared to ''S. carolitertii''. Only the ''P. duriense'' was found immediately downstream the water release in the most disturbed area. Furthermore, the preliminary results obtained with the Lateral Line Probe indicate that fish presence was associated with lower pressure fluctuations and asymmetry. The highest fluctuations and asymmetry were observed in areas where fish were not detected, whereas both presences and absences occurred in the whole range of mean front pressure.
-Based on these fish habitat use results, a lateral refuge (40 cm high; 40 cm wide and 50 cm long) was installed in the left river bank c. 40 m downstream the water release, where a high density of fish was found to occur. A multispectral stereo underwater camera was fixed inside the refuge to monitor refuge use under base and peak flow. Preliminary results indicate fish using the refuge c. 10 min after the turbines starting. Larger adults tend to appear after the turbine discharge reached 1 m<sup>3</sup>/s or more.
+Based on these fish habitat use results, a lateral refuge (40 cm high; 40 cm wide and 50 cm long) was installed in the left river bank c. 40 m downstream the water release, where a high density of fish was found to occur. A multispectral stereo underwater camera was fixed inside the refuge to monitor refuge use under base and peak flow. Preliminary results indicate fish using the refuge c. 10 min after the turbines start operation. Larger adults tend to appear after the turbine discharge reached 1 m<sup>3</sup>/s or more.
 The hydropeaking assessment indicated a combined score of 14 for the effect factors, corresponding to a large impact, and a combined score of 5.5 for the vulnerability factors, corresponding to a low impact. The final assessment, combining both the effect and vulnerability factors, resulted in an overall moderate (yellow) hydropeaking impact of the Bragado HPP.

@@ Line 60: / Line 60: @@
 =Results=
-Fish assemblage community of the Avelames River is dominated by small sized native cyprinids, as it is typical of similar rivers in northern Portugal. Iberian chub (''Squalius carolitertii'') (mean total length (TL) 9.7 ± 1.8 cm; mean total weight (TW) 12.6 ± 9.6 g), calandino (''Squalius alburnoides'') (TL 9.9 ± 1.9 cm; TW 7.5 ± 1.0 g), and Iberian nase (''Pseudochondrostoma duriense'') (TL 9.9 ± 1.9 cm; TW 10.4 ± 7.0 g) were tagged downstream Bragado HPP with passive integrated transponders to assess their habitat use and movement behaviour in response to hydropeaking. The total detection rate was 59%. Fish were distributed along the river reach with high density upstream the water release. ''P. duriense'' tend to prefer higher depths and higher velocities when compared to ''S. carolitertii''. Only the ''. duriense'' was found immediately downstream the water release in the most disturbed area. Furthermore, the preliminary results obtained with the Lateral Line Probe indicate that fish presence was associated with lower pressure fluctuations and asymmetry. The highest fluctuations and asymmetry were observed in areas where fish were not detected, whereas both presences and absences occurred in the whole range of mean front pressure.
+Fish assemblage community of the Avelames River is dominated by small sized native cyprinids, as it is typical of similar rivers in northern Portugal. Iberian chub (''Squalius carolitertii'') (mean total length (TL) 9.7 ± 1.8 cm; mean total weight (TW) 12.6 ± 9.6 g), calandino (''Squalius alburnoides'') (TL 9.9 ± 1.9 cm; TW 7.5 ± 1.0 g), and Iberian nase (''Pseudochondrostoma duriense'') (TL 9.9 ± 1.9 cm; TW 10.4 ± 7.0 g) were tagged downstream Bragado HPP with passive integrated transponders to assess their habitat use and movement behaviour in response to hydropeaking. The total detection rate was 59%. Fish were distributed along the river reach with high density upstream the water release. ''P. duriense'' tend to prefer higher depths and higher velocities when compared to ''S. carolitertii''. Only the ''P. duriense'' was found immediately downstream the water release in the most disturbed area. Furthermore, the preliminary results obtained with the Lateral Line Probe indicate that fish presence was associated with lower pressure fluctuations and asymmetry. The highest fluctuations and asymmetry were observed in areas where fish were not detected, whereas both presences and absences occurred in the whole range of mean front pressure.
 Based on these fish habitat use results, a lateral refuge (40 cm high; 40 cm wide and 50 cm long) was installed in the left river bank c. 40 m downstream the water release, where a high density of fish was found to occur. A multispectral stereo underwater camera was fixed inside the refuge to monitor refuge use under base and peak flow. Preliminary results indicate fish using the refuge c. 10 min after the turbines starting. Larger adults tend to appear after the turbine discharge reached 1 m<sup>3</sup>/s or more.

@@ Line 41: / Line 41: @@
 ===E-flow===
-The minimum instream flow/ecological flow to be released downstream Bragado weir was fixed as a percentage of the mean annual flow (approx. 5%), which was a common procedure by the time the scheme was licensed (1996). The HPP is obliged to release a minimum instream flow (e-flow) of 64 l/s, if such flow is compatible with the natural inflow. In periods with natural discharges smaller than 64 l/s, the whole inflow is automatically released downstream and the powerhouse does not operate.
+The minimum instream flow/ecological flow to be released downstream Bragado weir was fixed as a percentage of the mean annual flow (approx. 5%), which was a common procedure by the time the scheme was licensed (1996). The HPP is obliged to release a minimum instream flow (e-flow) of 64 l/s, if such flow is compatible with the natural inflow. In periods with natural discharges lower than 64 l/s, the whole inflow is automatically released downstream and the powerhouse does not operate.
-The efficiency of the instream minimum flow, regarding the environmental objectives set in the Water Framework Directive, has never been assessed; however, the water body were the HPP is located presents a Good Ecological State.
+The efficiency of the instream minimum flow, regarding the environmental objectives set in the Water Framework Directive, has never been assessed; however, the water body where the HPP is located presents a Good Ecological State.
 =Research objectives and tasks=

@@ Line 67: / Line 67: @@
 <gallery mode=packed>
-bragado_low_flow.jpg|Avelames River view, downstream of the Bragado powerplant, in a low flow situation
+bragado_low_flow.jpg|Avelames River view, downstream of the Bragado powerplant, in a low flow situation.
-bragado_fish_survey.jpg|Tagged fish survey upstream of the Bragado weir
+bragado_fish_survey.jpg|Tagged fish survey upstream of the Bragado weir.
 </gallery>

← Older revision		Revision as of 09:53, 29 June 2020
Line 65:		Line 65:

	The hydropeaking assessment indicated a combined score of 14 for the effect factors, corresponding to a large impact, and a combined score of 5.5 for the vulnerability factors, corresponding to a low impact. The final assessment, combining both the effect and vulnerability factors, resulted in an overall moderate (yellow) hydropeaking impact of the Bragado HPP.		The hydropeaking assessment indicated a combined score of 14 for the effect factors, corresponding to a large impact, and a combined score of 5.5 for the vulnerability factors, corresponding to a low impact. The final assessment, combining both the effect and vulnerability factors, resulted in an overall moderate (yellow) hydropeaking impact of the Bragado HPP.
		+
		+	=Gallery=
		+	<gallery mode=packed>
		+	bragado_low_flow.jpg\|Avelames River view, downstream of the Bragado powerplant, in a low flow situation
		+	bragado_fish_survey\|Tagged fish survey upstream of the Bragado weir
		+	</gallery>

	=Gallery=		=Gallery=

@@ Line 68: / Line 68: @@
 =Gallery=
 <gallery mode=packed>
-bragado_weir.jpg|Weir .
+bragado_weir.jpg|Weir.
-bragado_river-Avelames-downstream-the-powerhouse.jpg|Avelames River downstream of powerhouse tailrace .
+bragado_river-Avelames-downstream-the-powerhouse.jpg|Avelames River downstream of powerhouse tailrace.
-bragado_powerhouse-and-penstock.jpg|Penstock and powerhouse .
+bragado_powerhouse-and-penstock.jpg|Penstock and powerhouse.
-bragado_canal.jpg| Diversion canal .
+bragado_canal.jpg| Diversion canal.
-Bragado Layout2.png| Bragado HPP scheme .
+Bragado Layout2.png| Bragado HPP scheme.
-Bragado Layout1.png|Layout of Bragado HPP .
+Bragado Layout1.png|Layout of Bragado HPP.
 </gallery>