Bannwil test case - Revision history

Bendikhansen at 14:03, 8 June 2021

2021-06-08T14:03:55Z

Bendikhansen at 14:03, 8 June 2021

2021-06-08T14:03:44Z

Ismailalbayrak: /* Results */

2020-05-08T13:22:56Z

Results

Ismailalbayrak: /* Test case topics */

2020-05-08T13:20:43Z

Test case topics

Ismailalbayrak: /* Pressures on the water body's ecosystem */

2020-05-08T13:18:08Z

Pressures on the water body's ecosystem

Ismailalbayrak: /* About the hydropower plant */

2020-05-08T13:16:49Z

About the hydropower plant

Ismailalbayrak: /* Introduction */

2020-05-08T13:16:01Z

Introduction

Ismailalbayrak: /* Introduction */

2020-05-08T13:15:41Z

Introduction

Robert Boes: /* About the hydropower plant */

2020-04-29T09:11:49Z

About the hydropower plant

Robert Boes: /* Introduction */

2020-04-29T09:10:32Z

Introduction

← Older revision		Revision as of 14:03, 8 June 2021
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		+	{{Fact box for Bannwil}}
		+	{{Relevant SMTDs for Bannwil}}

	=Introduction=		=Introduction=

← Older revision		Revision as of 14:03, 8 June 2021
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−	~~{{Fact box for Bannwil}}~~
−	~~{{Relevant SMTDs for Bannwil}}~~

	=Introduction=		=Introduction=

← Older revision		Revision as of 13:22, 8 May 2020
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	=Results=		=Results=
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		+	The results of the studies on downstream fish migration at HPP Bannwil indicate that no fish injury is expected during fish spillway passage since fish terminal velocity is higher than the weir velocity. However, due to back-roll in the stilling basin of spillway, fish might be exposed to increased predation or strike to baffle blocks. Numerical model results also indicate that hydraulic conditions at potential positions of a fish guidance structure in front of the turbines are unfavorable.
		+
		+	Analysis of the Biological Performance Assessment (BioPA) based on the CFD simulation of the turbines indicate that the average fish friendliness scores of the HPP Bannwil are 9.1 and 8.5 out of 10 at an acclimation depth of 5 m and 10 m, respectively. The former i.e. 5 m is more realistic for the HPP regarding the depth of the river. For an absolute fish survival rating, this factor plays an important role.

	=Gallery=		=Gallery=

← Older revision		Revision as of 13:20, 8 May 2020
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	The fish pass needs to be restructured to accommodate larger fish in the near future. Current plans include replacing the lower part with a vertical slot pass and the upper part with a nature like open channel pass.		The fish pass needs to be restructured to accommodate larger fish in the near future. Current plans include replacing the lower part with a vertical slot pass and the upper part with a nature like open channel pass.
		+
		+	===Downstream migration===
		+	There is no specific measures implemented at HPP Bannwil. Fish can pass through the turbines and/or over the weirs when they are in operation. Weir discharge occurs on average (1935-2015) for about 42 days per year.

	=Research objectives and tasks=		=Research objectives and tasks=

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 =Pressures on the water body's ecosystem=
-The river Aare is located in the Rhine river catchment, which was historically one of the most important Atlantic salmon (Salmo salar) rivers in Europe. The upstream migration of salmons in the Rhine catchment became almost impossible after intense hydropower plant constructions, including the Aare river catchment. All of the occurring fish species present in the Aare river (total of 44 fish species) face potentially high mortality during downstream migration or difficulties during upstream migration.
+The river Aare is located in the Rhine river catchment, which was historically one of the most important Atlantic salmon (''Salmo salar'') rivers in Europe. The upstream migration of salmons in the Rhine catchment became almost impossible after intense hydropower plant constructions, including the Aare river catchment. All of the occurring fish species present in the Aare river (total of 44 fish species) face potentially high mortality during downstream migration or difficulties during upstream migration.
 Furthermore, the river Aare is highly influenced by hydropower and considered as a heavily modified water body. Moreover, there are three nuclear power plants on the Aare river, two of them reintroducing the used cooling water, which induces an increase of the river water temperature. The river has a moderate ecological potential. Measures for sediment control, fish migration, flow changes, habitat in-channel and morphology off-channel have been implemented in the water body.

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 =About the hydropower plant=
-The Bannwil weir is located on the right side of the river, while the powerhouse is located on the left side. The reservoir impoundment is about 7 km long. With thre bulb turbines, HPP Bannwil has an installed capacity of 28.5 MW and an average annaul production of 150 GWh. The gross head amounts to 5.5 - 8.5 m, depending on the up- and downstream water levels, with a designed discharge of 450 m<sup>3</sup>/s.
+The Bannwil weir is located on the right side of the river, while the powerhouse is located on the left side. The reservoir impoundment is about 7 km long. With three bulb turbines, HPP Bannwil has an installed capacity of 28.5 MW and an average annaul production of 150 GWh. The gross head amounts to 5.5 - 8.5 m, depending on the up- and downstream water levels, with a designed discharge of 450 m<sup>3</sup>/s.
 ===The Operator: BKW===
 HPP Bannwil is operated by the BKW group. The group plans, builds and operates infrastructure to produce and supply energy to businesses, households and the public sector, and offers digital business models for renewable energies. [https://www.bkw.ch/en/about-us/company/about-us/ Read more.]

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 There are in total 12 HPPs on the Aare river stretch between Lake Biel and the junction with the Rhine river, and two nuclear power plants with water abstraction for cooling.
-The altitude of the lowest and highest points of this river reach are ca. 312 m a.s.l. and 429 m a.s.l., respectively. The average altitude of the whole catchment amounts to 1060 m a.s.l. and the whole catchment area is 17687 km<sup>2</sup>, of which 1.4 % are covered by glaciers. On the river Aare, the mean monthly discharge increases from February to June and then decreases from July to October. The multi-year annual discharge amounts to 268 m<sup>3</sup>/s. The design discharge of HPP Bannwil of 450 m3/s is exceeded on average for about 42 days a year.
+The altitude of the lowest and highest points of this river reach are ca. 312 m a.s.l. and 429 m a.s.l., respectively. The average altitude of the whole catchment amounts to 1060 m a.s.l. and the whole catchment area is 17687 km<sup>2</sup>, of which 1.4 % are covered by glaciers. On the river Aare, the mean monthly discharge increases from February to June and then decreases from July to October. The multi-year annual discharge amounts to 268 m<sup>3</sup>/s.
 =About the hydropower plant=

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 The river Aare is a 291 km long tributary of the Rhine and the longest river within Switzerland. The Aare River passes through three major lakes: Lake of Brienz, Lake of Thun and Lake of Biel.
-I There are in total 12 HPPs on the Aare river stretch between Lake Biel and the junction with the Rhine river, and two nuclear power plants with water abstraction for cooling.
+There are in total 12 HPPs on the Aare river stretch between Lake Biel and the junction with the Rhine river, and two nuclear power plants with water abstraction for cooling.
 The altitude of the lowest and highest points of this river reach are ca. 312 m a.s.l. and 429 m a.s.l., respectively. The average altitude of the whole catchment amounts to 1060 m a.s.l. and the whole catchment area is 17687 km<sup>2</sup>, of which 1.4 % are covered by glaciers. On the river Aare, the mean monthly discharge increases from February to June and then decreases from July to October. The annual discharge in 2015 was 260 m<sup>3</sup>/s.