Event Title

Session C9: Monitoring the Downstream Passage of Small Fish at the TUM-Hydro Shaft Power Plant Prototype

Location

Groningen, The Netherlands

Event Website

http://fishpassage.umass.edu/

Start Date

24-6-2015 4:15 PM

End Date

24-6-2015 4:30 PM

Description

Abstract:

For the innovative TUM-Hydro Shaft Power Plant concept, we investigated the downstream passage of fish that can physically pass through the screen. Experimental investigations with live fish have already confirmed fish protection and fish downstream migration for a number of fish species and sizes bigger than the bar clearance at the TUM-Hydro Shaft Power Plant prototype. This investigation continues to evaluate the concept’s qualification for fish protection and its downstream migration efficiency.

The 35 kW prototype allowed nature-like but controlled open-air laboratory conditions for behavior studies with brown trout, grayling, barbell, minnow, and bullhead with body lengths from 5 – 20 cm. The passage distribution between the turbine and the fish downstream migration corridor as well as the injury and mortality rates during turbine passage were recorded for different flow velocities towards the screen and for different arrangements of the bypass.

The results reveal that portions of the downstream migrating or drifting fish did not pass through the turbine. Instead, they traversed the provided migration corridor. With regard to facility passage, the injury and mortality rates of the fish were smaller than the turbine specific injury and mortality rates. This was due to the passage distribution between turbine and bypass; however, detailed statements on migration distributions and damage rates depend on the respective fish species, fish sizes and facility configurations. Additionally, general influences of the parameters were assessed and the results were compared with literature references.

With regard to ecological requirements of specific river sites, the findings can be useful for the future design of hydro power plants; the methodology offers prospect for a more targeted adaption of these criteria for fish protection.

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Jun 24th, 4:15 PM Jun 24th, 4:30 PM

Session C9: Monitoring the Downstream Passage of Small Fish at the TUM-Hydro Shaft Power Plant Prototype

Groningen, The Netherlands

Abstract:

For the innovative TUM-Hydro Shaft Power Plant concept, we investigated the downstream passage of fish that can physically pass through the screen. Experimental investigations with live fish have already confirmed fish protection and fish downstream migration for a number of fish species and sizes bigger than the bar clearance at the TUM-Hydro Shaft Power Plant prototype. This investigation continues to evaluate the concept’s qualification for fish protection and its downstream migration efficiency.

The 35 kW prototype allowed nature-like but controlled open-air laboratory conditions for behavior studies with brown trout, grayling, barbell, minnow, and bullhead with body lengths from 5 – 20 cm. The passage distribution between the turbine and the fish downstream migration corridor as well as the injury and mortality rates during turbine passage were recorded for different flow velocities towards the screen and for different arrangements of the bypass.

The results reveal that portions of the downstream migrating or drifting fish did not pass through the turbine. Instead, they traversed the provided migration corridor. With regard to facility passage, the injury and mortality rates of the fish were smaller than the turbine specific injury and mortality rates. This was due to the passage distribution between turbine and bypass; however, detailed statements on migration distributions and damage rates depend on the respective fish species, fish sizes and facility configurations. Additionally, general influences of the parameters were assessed and the results were compared with literature references.

With regard to ecological requirements of specific river sites, the findings can be useful for the future design of hydro power plants; the methodology offers prospect for a more targeted adaption of these criteria for fish protection.

https://scholarworks.umass.edu/fishpassage_conference/2015/June24/36