Overview of typical compensation measures and results of ... · HPP Rheinfelden and Ryburg-Schwörstadt (Average discharge Upper Rhine: 1030 m³/s) 10.09.2018 FIThydro / Compensation

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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HPP Ryburg-Schwörstadt(max. 1460 m³/s, 120 MW, production: 760 Mio. kWh/a)

10.09.2018


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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HPP Rheinfelden(max. 1500 m³/s, 100 MW, production: 600 Mio. kWh/a)

10.09.2018


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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


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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


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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


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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


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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


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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


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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


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Results fish counting – Length of the registered

fish (logarithmic diagram)


10.09.2018


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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


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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

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Structural diversity of the shore and the river bed

Gravel deposits / 1500 m³ every two years

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Structural diversity on the shore and in the river bed

Quelle: Aquarius 201810.09.2018


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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

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Artificial erosion of river banks



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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

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Reconnecting flood plain (Aue Wallbach)



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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


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HPP Rheinfelden

Monitoring vegetation

Quelle: Ruess 20172013: Succession area 2016:

More vegetation on the

Succession areas

10.09.2018


total species:

2010: 251

2013: 318

2016: 335

Highest level in

succession areas

and meadows

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HPP Rheinfelden


Results – total species

Quelle: Ruess 2017

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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


Results – total number of endangered species (CH)

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Results landscape – slightly improved in the whole

perimeter

Quelle: Ruess 2017

Low quality

Low quality

High quality

Medium quality

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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

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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


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Artificial erosion sites are breeding places for the kingfisher

Monitoring HPP Rheinfelden

Birds

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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


Documents

Overview of typical compensation measures and results of ... · HPP Rheinfelden and Ryburg-Schwörstadt (Average discharge Upper Rhine: 1030 m³/s) 10.09.2018 FIThydro / Compensation