Schiffmühle test case - Revision history

Ismailalbayrak at 15:44, 30 September 2020

2020-09-30T15:44:22Z

Ismailalbayrak at 15:40, 30 September 2020

2020-09-30T15:40:21Z

Ismailalbayrak: /* Research objectives and tasks */

2020-05-08T14:09:05Z

Research objectives and tasks

Ismailalbayrak: /* E-flow */

2020-05-08T14:07:26Z

E-flow

Ismailalbayrak: /* Upstream migration */

2020-05-08T14:06:48Z

Upstream migration

Ismailalbayrak: /* Downstream migration */

2020-05-08T14:05:30Z

Downstream migration

Robert Boes: /* Gallery */

2020-04-28T09:21:53Z

Gallery

Robert Boes: /* Gallery */

2020-04-28T09:21:00Z

Gallery

Robert Boes: /* Gallery */

2020-04-28T09:19:16Z

Gallery

Robert Boes: /* Gallery */

2020-04-28T09:18:55Z

Gallery

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 ===Sediment management===
-An innovative vortex tube for bed load transport connectivity has been installed in 2002 in the headrace channel to guide bed load to the residual flow stretch of the Limmat river during floods. Additionally, sediment can be flushed via the weir flap gate.
+An innovative vortex tube for bed load transport connectivity has been installed in 2002 in the headrace channel to guide bed load to the residual flow stretch of the Limmat river during floods (see: https://www.fithydro.wiki/index.php/Bedload_monitoring_system). Additionally, sediment can be flushed via the weir flap gate.
 =Research objectives and tasks=

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 The hydropower plant (HPP) Schiffmühle is a run-of-the-river HPP located on the 35 km long stretch of the Limmat river in the communities of Untersiggenthal and Turgi near Baden, some 27 km downstream of Lake Zurich. Between lake Zurich and Schiffmühle there are seven HPPs, namely in flow direction Letten, Höngg , Dietikon, Wettingen, Aue, Oederlin and Kappelerhof. There are three more HPPs between HPP Schiffmühle and the junction with the Aare river, namely Turgi, Gebenstorf and Stroppel. The lowest and highest points of the Limmat river are 330 m and 406 m asl, respectively. The surface area of the whole catchment amounts to 2384 km<sup>2</sup>, of which 0.7 % are glaciated.
-On river Limmat, the mean monthly discharge increases from March to June and then decreases from July to October. The annual discharge in 2015 was 89 m<sup>3</sup>/s, while the long-term average is 101 m<sup>3</sup>/s (1951-2015).
+On river Limmat, the mean monthly discharge increases from March to June and then decreases from July to October. The mean annual discharge in 2015 was 89 m<sup>3</sup>/s, while the long-term average is 101 m<sup>3</sup>/s (1951-2015).
 =About the hydropower plant=

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 =Research objectives and tasks=
-The studies at HPP Schiffmühle address various aspects of the upstream and downstream fish passes, downstream habitat and sediment transport. The findings of the studies will have a wide range of applications for other HPPs and will give answers to the fundamental questions on fish behavior at fish passes.
+The studies at HPP Schiffmühle address various aspects of the upstream and downstream fish passes, downstream habitat and sediment transport. The findings of the studies have a wide range of applications for other HPPs and  give answers to the fundamental questions on fish behavior at fish passes.
 ===Research tasks===
 The research tasks and field studies conducted at HPP Schiffmühle are:

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 ===E-flow===
-The residual flow HPP Schiffmühle supplies up to 14.6 m<sup>3</sup>/s of turbine water and 0.67 m<sup>3</sup>/s of the water in the fish passage facilities (upstream and downstream) to the downstream river reach as e-flow. Moreover, during high river discharges, additional water is supplied over the frontal weir at the HPP and over the side weir along the headrace channel to the residual flow reach.
+The residual flow HPP Schiffmühle supplies up to 14.00 m<sup>3</sup>/s of turbine water and 0.67 m<sup>3</sup>/s of the water in the fish passage facilities (upstream and downstream) to the downstream river reach as e-flow. Moreover, during high river discharges, additional water is supplied over the frontal weir at the HPP and over the side weir along the headrace channel to the residual flow reach.
 ===Sediment management===

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 ===Upstream migration===
-HPP Schiffmühle has a combination of a nature-like and a technical fish pass (vertical slot) for upstream migration. The entrances of the nature-like fish pass and the vertical slot pass are located approx. 36 m and 2 m downstream of the turbine's suction tube outlet, respectively. The technical and the nature-like fish passes merge at an elevation of 336.83 m a.s.l. (see figures in the Gallery). From there on upwards, fish use the nature-like pass. The total discharge in the fishway is 0.5 m<sup>3</sup>/s.
+The residual flow HPP Schiffmühle has a combination of a nature-like and a technical fish pass (vertical slot) for upstream migration. The entrances of the nature-like fish pass and the vertical slot pass are located approx. 36 m and 2 m downstream of the turbine flow outlet, respectively. The technical and the nature-like fish passes merge at an elevation of 336.83 m a.s.l. (see figures in the Gallery). From there on upwards, fish use the nature-like pass. The total discharge in the fishway is 0.5 m<sup>3</sup>/s.
 To monitor upstream migration and fish behavior in the migration facilities, 5 PIT-tag antennas have been installed in the technical vertical slot fish pass and in the nature-like pass.

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 ===Downstream migration===
-At the residual flow HPP Schiffmühle, an angled fish guidance structure with horizontal bars, termed Horizontal Bar Rack (HBR), has been implemented in 2013 to shield fish from the turbine intake and guide them into a bypass and to the tailwater. The rack is positioned parallel to the main flow to have a lateral intake. The HBR has a length of 14.6 m and a spacing of 20 mm between the bars, which are positioned in a vertical angle of 90°. At the end of the rack there is the bypass inlet with three openings in a vertical chamber in different water depths (close to the bottom, central and close to the surface). From there, a 25 cm diameter pipe bypasses the fish downstream, letting them out at about 0.20 m above the tailwater level. The discharge in the bypass is 170 l/s.
+At the residual flow HPP Schiffmühle, an angled fish guidance structure with horizontal bars, termed Horizontal Bar Rack (HBR), has been implemented in 2013 to shield fish from the turbine intake and guide them into an adjacent bypass and to the tailwater. The rack is positioned parallel to the main flow to have a lateral intake. The HBR has a length of 14.6 m and a spacing of 20 mm between the bars, which are positioned in a vertical angle of 90°. At the end of the rack there is the bypass inlet with two openings in a vertical chamber in different water depths (close to the bottom and close to the surface). From there, a 25 cm diameter pipe bypasses the fish downstream, letting them out at about 0.20 m above the tailwater level. The discharge in the bypass is 170 l/s.
 For monitoring downstream migrating fish, 1 PIT-tag antenna has been installed at the bypass pipe inlet.

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 schiffmuhle_sediment-management_vortex_tube_photo_4.jpg|Outlet of sediment vortex tube at Schiffmühle HPP
 schiffmuhle_sediment-management_vortex_tube_setup.jpg|Setup of the sediment vortex tube at Schiffmühle HPP
-schiffmuhle_Calibration-of-sediment-monitoring-system-for-vortex-tube.jpg|Calibration of the sediment vortex tube monitoring at Schiffmühle HPP
+schiffmuhle_Calibration-of-sediment-monitoring-system-for-vortex-tube.jpg|Calibration of the sediment vortex tube monitoring system at Schiffmühle HPP
 </gallery>

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 Schiffmühle_aerial.png|Aerial overview of Schiffmühle HPP; flow direction from top to bottom
 schillmuhle_spillway.jpg|Residual flow HPP (left), flap-gated weir (centre) and headrace channel to the main HPP Schiffmühle (right); view to downstream
-schillmuhle_fishway.jpg|Nature-like fishpway at Schiffmühle HPP
+schillmuhle_fishway.jpg|Nature-like fishway at Schiffmühle HPP
 Layout-Picture_Schiffmühle_CVAW_ETHZ_web-scaled.jpg|Layout of Schiffmühle HPP
 schillmuhle_upstream-migration-devices_c_ETHZ_web-scaled.jpg|Overview of fish migration devices at Schiffmühle HPP