Post on 03-Nov-2020
Overview of typical compensation measures and
results of the monitoring campaign on the
Upper Rhine at two HPPs
10.09.2018 / FIThydro, Augsburg / Jochen Ulrich
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Overview Upper Rhine
HPP Rheinfelden and Ryburg-Schwörstadt
(Average discharge Upper Rhine: 1030 m³/s)
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
Basel
Lake Constance
HPP Rheinfelden
HPP Ryburg-Schwörstadt
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Overview Upper Rhine
HPP Ryburg-Schwörstadt(max. 1460 m³/s, 120 MW, production: 760 Mio. kWh/a)
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
4 12.08.2014 B. Karrer
In total 17 compensation measures
(to get new approval / no technical
changes at the HPP)
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Overview Upper Rhine
HPP Rheinfelden(max. 1500 m³/s, 100 MW, production: 600 Mio. kWh/a)
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Former HPP Rheinfelden – Construction: 1894-1898
…biggest river power plant at that time //
Main changes and impacts of new HPP
Higher Water level +1,4m -> changes in
hydraulics and ground water
Loss of rock
formation
and habitat
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Rheinfelden hydro power projekt
Overview after construction /
Overview fishways
Near-nature water course
Roughened fischway
Vertical-Slot fishway
In total more than 80 compensation measures
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Overview compensation measuresExamples will be shown in the presentation
• Fish passage (technical or near-nature fishways)
• Residual flow / Minimum flow
• Reconnecting oxbows, flood plains and small tributaries
• Renaturation
• Structural diversity of the shore and the river bed
• Specific measures to the protection of species
• Ground water
• Cultural Heritage
• Landscape / Recreation
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Fish passage / Minimum flow / Habitat structuresEcological functions of the near-nature water course /
Separate turbine for minimum flow purposes
Ecological functions:
• Riffles built out of gravel
(spawning ground for
common nase and barbel)
• Pools with gravel banks
(habitat for different species)
• Deeper flow path (to ensure
fish passage)
• Ecologically effective
habitat structures (Gravel
islands, rootstocks, trees, …)
Separate turbine 30m³/s
to ensure minimum flow
on the rocks (to save
spezialised species of
moss )
(positive results in the
last monitoring period!)
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Fish passage HPP Ryburg-Schwörstadt
Two entrances with connection to the river bed
and attraction flow
3D Graphic- Tailrace HPP Ryburg-Schwörstadt
The attraction flow is generated by the discharge of a separately built
300 kW - turbine
300 kW turbine / electricity + attraction flow
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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HPP Rheinfelden
Results of fish counting
Fish passage Upper Rhine 2005-2006
compared with the results of the 2012-2013
and 2016-2017 fish countings in Rheinfelden
Quelle: Guthruf 2017
2016-2017
Quelle: Aquarius 2013
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Comparison of the results of the Rheinfelden 2012-
2013 fish counting with the counting 2005/2006
Upper Rhine, total number of species
Quelle: Aquarius 2013The counting 2016-2017 showed almost the same
results like the 2012-2013-counting10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Results fish counting – Length of the registered
fish (logarithmic diagram)
Quelle: Aquarius 2013
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Comparision of the migrating species in the two
fishways (left: water course, right: vertical slot)
• Near-nature water course: 34 species
• Vertical slot: 24 species
Different abundance of species
Quelle: Aquarius 2013
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Fish passage
HPP Rheinfelden
Fish counting - summary
• High number of migrating fish
• Very high number of species
• Abundance of rare species has significantly grown
• No selectivity
• Target species are present
• Similar results at the HPP Ryburg-Schwörstadt
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Structural diversity of the shore and the river bed
Gravel deposits / 1500 m³ every two years
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Structural diversity on the shore and in the river bed
Quelle: Aquarius 201810.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Structural diversity of the shore and the river bed
Gravel deposits
Objectives:
• Spawning ground, reactivation of sediment transportation
Results monitoring:
• More gravel on the river banks and the river bed:
• But only few greylings in the initial feeding stage
• Spawning ground only in small quantities, gravel is eroded within short time
Optimization of the measures:
• Find a better site
• Coordination on the whole Upper Rhine
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Structural diversity of the shore and the river bed
Artificial erosion of river banks
Quelle: Aquarius 201810.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Structural diversity of the shore and the river bed
Artificial erosion of river banks
Objectives:
• Structure, small bays, trees as habitat
Results monitoring:
• Small scale gravel deposits
• Greylings an barbels
Optimization of the measures :
• none
• From time to time: remove vegetation
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Reconnecting flood plain (Aue Wallbach)
Quelle: Aquarius 201810.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Objectives:
• Dynamic, Structure, new oxbow, more habitats and retreat areas for juveniles
and small species
Results of monitoring:
• Sedimentation in the upper part, no more oxbow, but now backwater
• High fish density and many species – high improvement
• Valuable retreat area and habitat for juveniles and small species
Optimization of the measures:
• Backwater – very valuable – no measure to ensure reactivation of oxbo
• If sedimentation goes on – take some measures to ensure the backwater
habitat.
Reconnecting flood plain (Aue Wallbach)
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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HPP Rheinfelden
Monitoring vegetation
Quelle: Ruess 20172013: Succession area 2016:
More vegetation on the
Succession areas
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
total species:
2010: 251
2013: 318
2016: 335
Highest level in
succession areas
and meadows
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HPP Rheinfelden
Monitoring vegetation
Results – total species
Quelle: Ruess 2017
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Endangered
species (CH):
2010: 14
2013: 28
2016: 30
Highest level in
succession areas
and meadows
Quelle: Ruess 2017
HPP Rheinfelden
Monitoring vegetation
Results – total number of endangered species (CH)
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Results landscape – slightly improved in the whole
perimeter
Quelle: Ruess 2017
Low quality
Low quality
High quality
Medium quality
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Results landscape – slightly improved in the whole
perimeter
But also some places with lower quality
Quelle: Ruess 2017
Low quality
High quality
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Monitoring HPP Rheinfelden
Birds
Goosander family close to the rock formation Great Crested Greep is breeding at the
intake of the near-nature water course
Quelle: Ruess 2018
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Artificial erosion sites are breeding places for the kingfisher
Monitoring HPP Rheinfelden
Birds
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich
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Compensation measures at HPP Rheinfelden and
HPP Ryburg-Schwörstadt
Summary
• The results in upstream migration, vegetation and landscape are very
good.
• Most of the results in fauna are good as well, some of the measures
probably take some time to reach full ecological function.
• Most of the measures to improve the structural diversity of the shore and
the river bed are very successful: i.e. artificial erosion, trees,
oxbows/backwater. High fish density in these places.
• Finding the right place for gravel deposits that result in spawning grounds
for greylings seems to be difficult.
• Overall the compensation measures at the HPP Rheinfelden and Ryburg-
Schwörstadt are very successful and improve the habitat of terrestrical and
aquatic species significantly.
10.09.2018
FIThydro / Compensation measures / Jochen Ulrich