Freudenau test case

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Fact box: Freudenau
Country Austria
River Danube
Operator VERBUND
Capacity 172 MW
Head 8.6 m
Inter-annual discharge 3000 m3/s
Turbine(s) 6 Kaplan bulb turbines
Detailed report Click for pdf
Relevant solutions Applied in test case?
Construction of off-channel habitats Yes
Environmental design of embankments and erosion protection Yes
Fish refuge under hydropeaking conditions Yes
Nature-like fishways Yes
Placement of spawning gravel in the river Yes
Placement of stones in the river Yes
Pool-type fishways Yes
Relevant MTDs Applied in test case?
3D sensorless, ultrasound fish tracking -
Acoustic Doppler current profiler (ADCP) Yes
Acoustic Doppler velocimetry (ADV) -
Acoustic telemetry Yes
Agent based model -
Barotrauma detection system -
BASEMENT -
Bedload monitoring system Yes
CASiMiR -
Current meter -
Differential pressure sensor base artificial lateral line probe, iRon -
FLOW-3D Yes
HEC-RAS -
LiDAR -
OpenFOAM -
Particle image velocimetry (PIV) -
Radio frequency identification with passive integrated transponder (PIT tagging) -
Radio telemetry -
River2D -
Shelter measurements -
Structure from motion (SfM) -
TELEMAC Yes

Introduction

The Danube River is the second longest river in Europe with a total length of 2,850 km and a total catchment area of 817,000 km2. The project area is located on the upper reach of the Danube River (distance from the mouth: 1,921 km, catchment area: 100,700 km²) within the city of Vienna/Republic of Austria. The inter-annual discharge varies between 900 to 5000 m3/s.

The Danube water body upstream of the Test Case is classified as having a moderate to worse ecological potential, while the waterbody downstream is classified as a natural water body with good ecological status.

About the hydropower plant

The hydropower plant at Freudenau is a run-of river hydropower plant. It has an installed capacity of 172 MW and a mean annual output of 1,052 GWh.

Layout

The Hydropower Plant at Freudenau is a multi-purpose hydro-power scheme located in the southern region of the Vienna metropolitan area. Six Kaplan bulb turbines are installed in the power house which is located in the middle of the river between the lock and weir systems. With a runner diameter of 7.5 m the turbines rank among the biggest in Europe. Ecological measures include the water supply to the New and Old Danube, new biotopes, and an ecologically designed bypass stream as a fishway on the Danube island.

The Operator: VERBUND

VERBUND is Austria’s leading electricity company and one of the largest producers of electricity from hydropower in Europe. More than four fifths of its electricity is produced by hydropower, supplemented by thermal and wind power. VERBUND power plants cover 40% of the annual Austrian electricity requirement of approx. 70,000 million kWh. VERBUND was founded in 1947 and has been listed on the Vienna Stock Exchange since 1988; 51 % of the company’s shares are owned by the Republic of Austria.

In the area of the research & development of new applications for electricity, VERBUND is among the pioneers and innovation leaders and also rich in experience in successful implementation of LIFE Nature projects (e.g. LIFE+ Traisen, LIFE+ Netzwerk Donau).

Pressures on the water body's ecosystem

The Upstream water body (409040013) is a heavily modified water body with the following main pressures: hydropower, navigation and flood control.

All pressures are directly anthropogenic and highly connected to the need to save life and goods as well as economical use. The ecological potential based on the WFD is “moderate or worse”. The reasons for designation as HMWB ((heavily modified waterbody) are manifold and any measures to reach the good ecological status have significant adverse effects on hydropower, navigation, & flood control.

The Downstream water body (409040008) is a natural water body with the main pressures: navigation and flood control. The ecological status is defined as “good”.

Research objectives and tasks

Research tasks

Results