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Improving passage conditions for downstream moving fish at hydroelectric plants
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.ORCID iD: 0000-0002-3191-7140
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2010 (English)Conference paper, (Refereed)
Abstract

Many attempts at defragmenting regulated rivers only address the issue of upstream passage. Large sums of money are being spent on trying to solve the upstream passage problems at hydroelectric facilities, disregarding the problems experienced by both juvenile and adult anadromous fish on their way to the sea. Fish can be delayed, injured or even killed when attempting to pass hydroelectric plants (HEPs) via turbines, bypass devices, spill gates, trash gates or trash racks. Mitigation measures are increasingly employed to decrease the risk of injury to migratory fish at dams, mainly by preventing fish from entering the turbines and directing them to alternative routes with low risk of injury. Most frequently, screens are installed to prevent ingress into turbines, and in many countries this is a legislative requirement. However, the impingement of fish on the screens under high velocities can also result in significant mortality, and in some cases may negate the benefit associated with their placement.

This presentation describes the background, design and evaluation of four rehabilitative measures at hydroelectric plants (HEPs) in southern Sweden. In the River Ätran low sloping racks and surface spill gates were implemented and tested for eels, trout and Atlantic salmon. In the River Emån the rehabilitative work focused on if a low-sloping rack and a surface spill gate could improve the passage conditions for anadromous trout and chub. In the River Alsterälven downstream migrating silver eels were offered spill pipes at different depths to study their depth preference.

Place, publisher, year, edition, pages
Visby, 2010.
National Category
Biological Sciences
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-11590OAI: oai:DiVA.org:kau-11590DiVA: diva2:493179
Conference
The 28th Oikos meeting
Projects
Fri fiskvandring i Ätran - Falkenbergs kommun
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-11-12Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
  • html
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  • asciidoc
  • rtf