Altheim test case - Revision history

LB at 14:02, 21 October 2020

2020-10-21T14:02:25Z

2020-09-29T12:54:03Z

Results

2020-04-24T09:17:28Z

Gallery

2020-04-24T08:18:09Z

2020-04-24T08:11:15Z

About the hydropower plant

2020-04-24T06:41:05Z

About the hydropower plant

2020-04-24T06:34:09Z

Gallery

2020-04-24T06:30:59Z

Gallery

2020-04-24T06:28:10Z

Gallery

2020-04-22T08:47:23Z

← Older revision		Revision as of 14:02, 21 October 2020
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	Altheim underwater.jpg\|thumb\|Underwater picture of fish at one of the structures (source: Uniper).		Altheim underwater.jpg\|thumb\|Underwater picture of fish at one of the structures (source: Uniper).
	</gallery>		</gallery>
−
−	~~=Relevant Literature=~~

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 * Evaluating the maintenance costs of a nature-like fish pass
 =Results=
-Over a total length of 1.5 km of the natural fish pass one habitat structure every 100 m has been implemented. The structures mainly consist of dead wood and spawning gravel and were constructed as spawning habitats, juvenile habitats or shelter but also to generally increase the variability in flow conditions. 5 structures are being observed with underwater photography in comparison to similar locations within in the fish pass without structural improvements to compare the effects and benefits. The first impressions indicate that the new habitat structures show a much higher density of the relevant fish species.
+Over a total length of about 1.5 km of the natural fish pass 37 different habitat structures have been implemented. The structures mainly consist of dead wood and spawning gravel and were constructed as spawning habitats, juvenile habitats or shelter but also to generally increase the variability in flow conditions. The value of these structures was evaluated from October 2019 to May 2020.
 =Gallery=

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 altheim_natural_fishway_downstream.jpg|View of the Altheim nature-like fishway from downstream (source: Uniper).
 altheim_migration_layout.jpg|Layout of the fish migration system at the hydropower plant Altheim (source: google maps, Uniper).
 </gallery>
 =Relevant Literature=

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 The catchment area of the Isar covers 8960 km<sup>2</sup> in the Alps and the Karwendel mountains. The Isar is generally divided into three sections: the Upper Isar, the Middle Isar and the Lower Isar. The Test Case hydropower plant Altheim is located in the Lower Isar, at km 67.2, near the town Altheim. Downstream of the Test Case, 7 additional hydropower plants are located along the Isar.
-The section of the Isar that relates to the Test Case Altheim has a catchment area of 88.2 km<sup>2</sup> and is about 73 km long. It has an intern-annual discharge of 163 m<sup>3</sup>/s. It is classified as a waterbody with poor ecological status.
+The section of the Isar that relates to the Test Case Altheim has a catchment area of 88.2 km<sup>2</sup> and is about 73 km long. It has an intern-annual discharge of 163 m<sup>3</sup>/s. Typically the discharge characteristics show high flows and fast floods in spring time during snow melt and rather low flows in winter. It is classified as a waterbody with poor ecological status.
 =About the hydropower plant=

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 =About the hydropower plant=
-The hydropower plant at Altheim, commissioned in 1951, is a block-type hydropower plant and part of a chain of power plants in the Isar. The catchment area of this river stretch is about 7.908 km² It has an installed capacity of 17.8 MW and a mean annual output of 91.4 GWh. The plant has a gated weir with 4 bays located on the right of the power house and a head storage volume of 1,980,000 m<sup>3</sup>.
+The hydropower plant at Altheim, commissioned in 1951, is a block-type hydropower plant and part of a chain of power plants in the Isar. The catchment area of this river stretch is about 7.908 km². It has an installed capacity of 17.8 MW and a mean annual output of 91.4 GWh. The plant has a gated weir with 4 bays located on the right of the power house and a head storage volume of 1,980,000 m<sup>3</sup>.
 The normal operating level is at 384.00 m above sea level, in swelling operation it can be lowered by 1.00 m. On average, there are 2 peaks per day, where the flow changes roughly between 50 m<sup>3</sup>/s and 170 m<sup>3</sup>/s with ramps of about 100 m<sup>3</sup>/s per hour or a change of water level between +45 cm/h to - 30 cm/h.

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 </gallery>
 [[File:Altheim structure 1.jpg|thumb|Implementation of rocks to vary flow conditions (source: Uniper)]]
-[[File:Altheim structure 2|thumb|Relocation of gravel as spawning habitat (source: Uniper)]]
+[[File:Altheim structure 2.jpg|thumb|Relocation of gravel as spawning habitat (source: Uniper)]]
 [[File:Altheim underwater.jpg|thumb|Underwater picture of fish at one of the structures]]
 =Relevant Literature=

@@ Line 40: / Line 40: @@
 =Gallery=
 <gallery mode=packed>
-altheim_overview.jpg|Aerial view of Altheim dam, power plant, and reservoir.
+altheim_overview.jpg|Aerial view of Altheim dam, power plant, and reservoir (source: Uniper).
-altheim_natural_fishway.jpg|Entrance to the nature-like fishway in Altheim.
+altheim_natural_fishway.jpg|Entrance to the nature-like fishway at Altheim (source: Uniper).
-altheim_layout.png|Layout of the Altheim powerplant and the surrounding area,
+altheim_layout.png|Layout of the Altheim powerplant and the surrounding area (source: google maps, Uniper).
-altheim_natural_fishway_downstream.jpg|View of the Altheim nature-like fishway from downstream.
+altheim_natural_fishway_downstream.jpg|View of the Altheim nature-like fishway from downstream (source: Uniper).
-altheim_migration_layout.jpg|Layout of the Altheim fish migration system.
+altheim_migration_layout.jpg|Layout of the fish migration system at the hydropower plant Altheim (source: google maps, Uniper).
 </gallery>
 =Relevant Literature=