Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers
Abstract This article proposes and demonstrates a new classification system of fish population level effects of hydropeaking operations in rivers. The classification of impacts is developed along two axes; first, the hydromorphological effect axis assesses the ecohydraulic alterations in rivers intr...
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Online Access: | http://dx.doi.org/10.1002/rra.3917 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3917 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3917 |
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crwiley:10.1002/rra.3917 2024-09-15T17:56:15+00:00 Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers Bakken, Tor Haakon Harby, Atle Forseth, Torbjørn Ugedal, Ola Sauterleute, Julian F. Halleraker, Jo H. Alfredsen, Knut Norges Forskningsråd 2021 http://dx.doi.org/10.1002/rra.3917 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3917 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3917 en eng Wiley http://creativecommons.org/licenses/by/4.0/ River Research and Applications volume 39, issue 3, page 313-325 ISSN 1535-1459 1535-1467 journal-article 2021 crwiley https://doi.org/10.1002/rra.3917 2024-08-13T04:18:27Z Abstract This article proposes and demonstrates a new classification system of fish population level effects of hydropeaking operations in rivers. The classification of impacts is developed along two axes; first, the hydromorphological effect axis assesses the ecohydraulic alterations in rivers introduced by rapid and frequent variations in flow and water level, second the vulnerability axis assesses the site‐specific vulnerability of the fish population. Finally, the population level impact is classified into four classes from small to very large by combining the two axes. The system was tested in four rivers in Norway exposed to hydropeaking, and they displayed a range of outcomes from small to very large impacts on the salmon populations. The river with a relatively high base flow and ramping restrictions scored better than rivers with the lower base flow or limited ramping restrictions, indicating that hydropeaking effects can be mitigated while maintaining high hydropower flexibility. Most effect factors could easily be calculated from timeseries of discharge and water level, whereas the use of hydraulic models to estimate potential stranding areas may require more work. The vulnerability factors are mainly qualitative and depend more heavily on expert judgments and are thus more uncertain. The system was deemed suitable for the purpose of supporting management decisions for rivers exposed to hydropeaking operations. It evaluates the severity of the additional pressures due to hydropeaking operations and proved useful to identify mitigating measures. While the system was developed for Atlantic salmon river systems, it could be adapted to other species or systems. Article in Journal/Newspaper Atlantic salmon Wiley Online Library River Research and Applications |
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English |
description |
Abstract This article proposes and demonstrates a new classification system of fish population level effects of hydropeaking operations in rivers. The classification of impacts is developed along two axes; first, the hydromorphological effect axis assesses the ecohydraulic alterations in rivers introduced by rapid and frequent variations in flow and water level, second the vulnerability axis assesses the site‐specific vulnerability of the fish population. Finally, the population level impact is classified into four classes from small to very large by combining the two axes. The system was tested in four rivers in Norway exposed to hydropeaking, and they displayed a range of outcomes from small to very large impacts on the salmon populations. The river with a relatively high base flow and ramping restrictions scored better than rivers with the lower base flow or limited ramping restrictions, indicating that hydropeaking effects can be mitigated while maintaining high hydropower flexibility. Most effect factors could easily be calculated from timeseries of discharge and water level, whereas the use of hydraulic models to estimate potential stranding areas may require more work. The vulnerability factors are mainly qualitative and depend more heavily on expert judgments and are thus more uncertain. The system was deemed suitable for the purpose of supporting management decisions for rivers exposed to hydropeaking operations. It evaluates the severity of the additional pressures due to hydropeaking operations and proved useful to identify mitigating measures. While the system was developed for Atlantic salmon river systems, it could be adapted to other species or systems. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Bakken, Tor Haakon Harby, Atle Forseth, Torbjørn Ugedal, Ola Sauterleute, Julian F. Halleraker, Jo H. Alfredsen, Knut |
spellingShingle |
Bakken, Tor Haakon Harby, Atle Forseth, Torbjørn Ugedal, Ola Sauterleute, Julian F. Halleraker, Jo H. Alfredsen, Knut Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers |
author_facet |
Bakken, Tor Haakon Harby, Atle Forseth, Torbjørn Ugedal, Ola Sauterleute, Julian F. Halleraker, Jo H. Alfredsen, Knut |
author_sort |
Bakken, Tor Haakon |
title |
Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers |
title_short |
Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers |
title_full |
Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers |
title_fullStr |
Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers |
title_full_unstemmed |
Classification of hydropeaking impacts on Atlantic salmon populations in regulated rivers |
title_sort |
classification of hydropeaking impacts on atlantic salmon populations in regulated rivers |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/rra.3917 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rra.3917 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3917 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
River Research and Applications volume 39, issue 3, page 313-325 ISSN 1535-1459 1535-1467 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/rra.3917 |
container_title |
River Research and Applications |
_version_ |
1810432464621928448 |