Günz test case - Revision history

LB: /* About the hydropower plants */

2020-10-23T14:55:30Z

About the hydropower plants

LB at 10:36, 21 October 2020

2020-10-21T10:36:38Z

LB: /* Results */

2020-10-21T10:31:44Z

Results

LB at 15:31, 29 April 2020

2020-04-29T15:31:59Z

IBF Umwelt: /* The Operator: LEW Wasserkraft GmbH (LEW) */

2020-04-28T19:24:05Z

The Operator: LEW Wasserkraft GmbH (LEW)

IBF Umwelt: /* Introduction */

2020-04-28T19:22:04Z

Introduction

IBF Umwelt: /* Pressures on the water body's ecosystem */

2020-04-27T20:06:29Z

Pressures on the water body's ecosystem

IBF Umwelt: /* The Operator: Bayerische Elektrizitätswerke GmbH (BEW) */

2020-04-27T20:05:59Z

The Operator: Bayerische Elektrizitätswerke GmbH (BEW)

TUM-PERU: /* Research tasks */

2020-04-22T12:37:45Z

Research tasks

TUM-PERU: /* The Operator: Bayerische Elektrizitätswerke GmbH (BEW) */

2020-04-22T12:22:27Z

The Operator: Bayerische Elektrizitätswerke GmbH (BEW)

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 =About the hydropower plants=
 The Test Case Günz comprises 5 consecutive hydropower plants. Four of them are run-of-river hydropower plants and one, the HPP Oberegg, has a diverted reach.
-Each of the 5 HPPs is equipped with one Kaplan-turbine, with installed capacities of 350 kW at Waldstetten, 450 kW at(Höselhurst and Wattenweiler, 600 kW at Ellzee and 1100 kW at Oberegg. The annual output is between 1.8 – 3.7 millions kWh . The height drop ranges from 3.9 to 8.3 m at the different HPPs.
+Each of the 5 HPPs is equipped with one Kaplan-turbine, with installed capacities of 350 kW at Waldstetten, 550 kW at Höselhurst, 520 kW at Wattenweiler, 720 kW at Ellzee and 1100 kW at Oberegg. The annual output is between 1.4 - 3.1 GWh . The height drop ranges from 3.9 to 8.3 m at the different HPPs.
 ===Layout===
 The HPPs Höselhurst, Wattenweiler, Ellzee and Waldstetten are run-of-river HPPs, the HPP Oberegg is a diversion hydropower plant (Ausleitungskraftwerk). In the upstream areas of the HPPs there are reservoirs. In the downstream areas the river Günz is still free flowing until the head of the next reservoir. There is a fish bypass channel at every HPP. At the run-of river HPPs they are built as a classical conventional pond system. At Oberegg the fish passage facility for upstream fish migration is integrated into the diverted reach, which is called “Alte Günz”.

← Older revision		Revision as of 10:36, 21 October 2020
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	gunz-nature-like-fishway.jpg\|Close-up of a nature-like fishway in the Günz river (source: Nicole Kalinowski, IBF Umwelt).		gunz-nature-like-fishway.jpg\|Close-up of a nature-like fishway in the Günz river (source: Nicole Kalinowski, IBF Umwelt).
	</gallery>		</gallery>
−
−	~~=Relevant Literature=~~

← Older revision		Revision as of 10:31, 21 October 2020
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	=Results=		=Results=
		+	In February 2018 and 2019, gravel was implemented as a spawning ground in 4 of the 5 fish passes of LEW Wasserkraft at the river Günz. Afterwards the spawning activities were monitored on a daily basis. A special focus was put on the nase (Chondrostoma nasus), which was very common in former times in the Günz, like in the “barb region” of most rivers in Bavaria.
		+
		+	The nase was selected as a success indicator for the design of the spawning grounds, because their spawning activities depend on the water temperature.
		+
		+	In 2018 the successful spawning of the nase could be verified at the fish pass in Wattenweiler all over the area, where new gravel was implemented. Many eggs were found in that section, just a view days after the gravel was inserted. In the other fish passes downstream, no eggs were found in that year. This was probably because the spawning season of the nase was very early in spring 2018 and the adding of gravel happened too late for that. In 2019 spawning nase were found in all fish passes with ponds with new gravel, but also in ponds where the gravel from the first year was mechanically re-allocated. While the coarse substrates of the initial situation were also used for spawning (nase and dace (Leuciscus leuciscus), the numbers showed that the nase clearly prefers the ponds with new gravel.
		+
		+	The gravel ponds, prepared in 2018, had a relatively strong grade of colmation in 2019, which means that the gaps between the gravel was filled with fine sediments. However, the gravel still was still loose enough for the fish to re-allocate it when preparing their spawning pits. The colmation of the substrate is caused by the static water flow from the main river, which is common in all fish passes. A natural dynamic, in terms of a re-allocation of the bed load, is missing. As the fish were found to prefer new, clean gravel, this results in an expected very good functioning of the new spawning grounds for about two year.
		+
		+	A recommendation from these findings is therefore to include the option to “irrigate” the ponds, when planning the construction of a new fish pass. This could be achieved, for example, with additional pipes that cross the dam. They offer the opportunity to multiplicate the water flow temporarily, enabling a certain nature-like dynamic with a re-allocation of the substrates.
		+
		+	To conclude, the preparation of spawning grounds in existing fish passes by inserting gravel, was a great success, also in terms of a good cost-benefit-ratio.

	=Gallery=		=Gallery=

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 Gunz_elizee_HPP.jpg| The hydropower plant Ellzee on the river Günz (source: LEW).
 Gunz_hosenhurst_hpp.jpg|The hydropower plant Hösellhurst with fish pass on the river Günz (source: Olav König).
-Gunz_oberegg_hpp.jpg|The hydropower plant Oberegg on the river Günz (source: LEW).
+Gunz_oberegg_hpp.jpg|The diversion weir at Deisenhausen, upstream of the hydropower plant Oberegg (source: LEW).
 Günz-layout.png|Location of the 5 test case hydropower plants on the Günz river (source: LEW).
 HPP-Ellzee-nature-like-fishway.jpg|View of the hydropower plant and nature like fishway at Ellzee (source: Olav König).

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 The HPPs Höselhurst, Wattenweiler, Ellzee and Waldstetten are run-of-river HPPs, the HPP Oberegg is a diversion hydropower plant (Ausleitungskraftwerk). In the upstream areas of the HPPs there are reservoirs. In the downstream areas the river Günz is still free flowing until the head of the next reservoir. There is a fish bypass channel at every HPP. At the run-of river HPPs they are built as a classical conventional pond system. At Oberegg the fish passage facility for upstream fish migration is integrated into the diverted reach, which is called “Alte Günz”.
 ===The Operator: LEW Wasserkraft GmbH (LEW)===
-The LEW is a 100 % subsidiary of the Lechwerke AG. It runs and maintains 36 HPPs at the rivers Danube, Günz, Lech and Iller and is thereby one of the leading HPP operators in Bavaria, Germany. The company produces over 1 billion kWh energy out of regenerative hydropower per year. [http://www.bew-augsburg.de/ Read more.]
+The LEW Wasserkraft is a 100 % subsidiary of the Lechwerke AG. It runs and maintains 36 HPPs at the rivers Danube, Günz, Lech and Iller and is thereby one of the leading HPP operators in Bavaria, Germany. The company produces over 1 billion kWh energy out of regenerative hydropower per year. [https://wasserkraft.lew.de/lew-wasserkraft]
 =Pressures on the water body's ecosystem=

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 =Introduction=
-The river Günz is located in the southern part of Bavaria, Germany. It is about 55 km long and flows into the river Danube near the city Günzburg. The catchment area of the river Günz is 710 km<sup>2</sup>. The Günz is fed by the confluence of the “Eastern Günz” and the “Western Günz” near the small city Lauben. The Test Case consists of a row of 5 hydropower plants, which are located on the Günz.
+The river Günz is located in the southern part of Bavaria, Germany. It is about 60 km long and flows into the river Danube near the city Günzburg. The catchment area of the river Günz is 710 km<sup>2</sup>. The Günz is fed by the confluence of the “Eastern Günz” and the “Western Günz” near the small city Lauben. The Test Case consists of a row of 5 hydropower plants, which are located on the Günz.
 The hydrology of the Günz is characterized by flood peaks in winter due to snow melting and some flood peaks in the summer after heavy rain events. The catchment area of the river Günz is 710 km<sup>2</sup> The mean interannual discharge of the river Günz is estimated at 7.8 m<sup>3</sup>/s. The river is classified with a moderate ecological status.

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 =Pressures on the water body's ecosystem=
-The main pressures on the water body are hydrology, agricultural use of pesticides, effluents from a nearby water treatment plant, and to some extent the spill over from storm water overflow. Previously, continuity was classified as a high pressure, but this was counteracted through the building of fishways in 2014. The pressures are mainly caused of morphological issues which are results of the HPP. There is a lack of important habitats like juvenile habitats, spawning habitats and the reophilic interstitial. The BEW is working on this problems with a restauration program.
+The main pressures on the water body are hydrology, agricultural use of pesticides, effluents from a nearby water treatment plant, and to some extent the spill over from storm water overflow. Previously, continuity was classified as a high pressure, but this was counteracted through the building of fishways in 2014. The pressures are mainly caused of morphological issues which are results of the HPP. There is a lack of important habitats like juvenile habitats, spawning habitats and the reophilic interstitial. The LEW is working on this problems with a restauration program.
 =Test case topics=

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 * Potential test of CIA tools
 * Management, monitoring and construction of spawning habitats in fishway
-* Numerical Simulation
+* Numerical simulations of flow and habitat conditions in the fishway
 =Results=