A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow

Kristian Angele; Patrik Andreasson; Ake Forssen; David Aldven; Gustav Hellstrom; Kjell Leonardsson

doi:doi:10.11648/j.ajwse.20210702.14

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A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow

Kristian Angele, Patrik Andreasson, Ake Forssen, David Aldven, Gustav Hellstrom, Kjell Leonardsson

Published in American Journal of Water Science and Engineering (Volume 7, Issue 2)

Received: 22 April 2021 Accepted: 24 May 2021 Published: 4 June 2021

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Abstract

A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and by-pass the case study hydropower plant, it must be able to localize the attraction flow where it enters the main flow from the tailrace of the hydropower plant in the so-called confluence area. Here the comparatively small and limited attraction flow from the old river channel must be improved in order to be able compete with the substantially larger main flow. The objective of the present study is to investigate the feasibility of a new concept for further improvement of the attraction flow using guiding walls forming a contraction channel. Field measurements were performed tracing tagged fish in the confluence area downstream of the case study hydropower plant in order to understand the movement pattern of the fish. Based on the results, and results from bathymetry measurements in the same area, a physical scale model was constructed where it was experimentally demonstrated that it is hydraulically feasible to construct guiding walls, forming a contraction, which accelerate the attraction flow and generate a concentrated turbulent jet with a higher velocity, while keeping the flow rate unchanged. The attraction flow penetrates about half-way (70 m) into the main flow and reaches the position where most fish are positioned according to fish position measurements and therefore potentially has a good ability to attract upstream migrating fish. There is no negative impact on the water level in the confluence area and thereby not on electricity production. It was shown that the results can be scaled up to prototype conditions and the strategy can presumably be generalized to similar flow situations, existing at other hydropower plants, allowing for improved upstream fish migration in coexistence with a sound hydropower production.

Published in	American Journal of Water Science and Engineering (Volume 7, Issue 2)
DOI	10.11648/j.ajwse.20210702.14
Page(s)	57-71
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Attraction Flow, Salmon, Fish Migration, Acoustic Telemetry, Physical Scale Model Test, Hydropower

References

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APA Style

Kristian Angele, Patrik Andreasson, Ake Forssen, David Aldven, Gustav Hellstrom, et al. (2021). A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. American Journal of Water Science and Engineering, 7(2), 57-71. https://doi.org/10.11648/j.ajwse.20210702.14

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ACS Style

Kristian Angele; Patrik Andreasson; Ake Forssen; David Aldven; Gustav Hellstrom, et al. A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. Am. J. Water Sci. Eng. 2021, 7(2), 57-71. doi: 10.11648/j.ajwse.20210702.14

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AMA Style

Kristian Angele, Patrik Andreasson, Ake Forssen, David Aldven, Gustav Hellstrom, et al. A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. Am J Water Sci Eng. 2021;7(2):57-71. doi: 10.11648/j.ajwse.20210702.14

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@article{10.11648/j.ajwse.20210702.14,
  author = {Kristian Angele and Patrik Andreasson and Ake Forssen and David Aldven and Gustav Hellstrom and Kjell Leonardsson},
  title = {A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow},
  journal = {American Journal of Water Science and Engineering},
  volume = {7},
  number = {2},
  pages = {57-71},
  doi = {10.11648/j.ajwse.20210702.14},
  url = {https://doi.org/10.11648/j.ajwse.20210702.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajwse.20210702.14},
  abstract = {A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and by-pass the case study hydropower plant, it must be able to localize the attraction flow where it enters the main flow from the tailrace of the hydropower plant in the so-called confluence area. Here the comparatively small and limited attraction flow from the old river channel must be improved in order to be able compete with the substantially larger main flow. The objective of the present study is to investigate the feasibility of a new concept for further improvement of the attraction flow using guiding walls forming a contraction channel. Field measurements were performed tracing tagged fish in the confluence area downstream of the case study hydropower plant in order to understand the movement pattern of the fish. Based on the results, and results from bathymetry measurements in the same area, a physical scale model was constructed where it was experimentally demonstrated that it is hydraulically feasible to construct guiding walls, forming a contraction, which accelerate the attraction flow and generate a concentrated turbulent jet with a higher velocity, while keeping the flow rate unchanged. The attraction flow penetrates about half-way (70 m) into the main flow and reaches the position where most fish are positioned according to fish position measurements and therefore potentially has a good ability to attract upstream migrating fish. There is no negative impact on the water level in the confluence area and thereby not on electricity production. It was shown that the results can be scaled up to prototype conditions and the strategy can presumably be generalized to similar flow situations, existing at other hydropower plants, allowing for improved upstream fish migration in coexistence with a sound hydropower production.},
 year = {2021}
}

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TY  - JOUR
T1  - A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow
AU  - Kristian Angele
AU  - Patrik Andreasson
AU  - Ake Forssen
AU  - David Aldven
AU  - Gustav Hellstrom
AU  - Kjell Leonardsson
Y1  - 2021/06/04
PY  - 2021
N1  - https://doi.org/10.11648/j.ajwse.20210702.14
DO  - 10.11648/j.ajwse.20210702.14
T2  - American Journal of Water Science and Engineering
JF  - American Journal of Water Science and Engineering
JO  - American Journal of Water Science and Engineering
SP  - 57
EP  - 71
PB  - Science Publishing Group
SN  - 2575-1875
UR  - https://doi.org/10.11648/j.ajwse.20210702.14
AB  - A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and by-pass the case study hydropower plant, it must be able to localize the attraction flow where it enters the main flow from the tailrace of the hydropower plant in the so-called confluence area. Here the comparatively small and limited attraction flow from the old river channel must be improved in order to be able compete with the substantially larger main flow. The objective of the present study is to investigate the feasibility of a new concept for further improvement of the attraction flow using guiding walls forming a contraction channel. Field measurements were performed tracing tagged fish in the confluence area downstream of the case study hydropower plant in order to understand the movement pattern of the fish. Based on the results, and results from bathymetry measurements in the same area, a physical scale model was constructed where it was experimentally demonstrated that it is hydraulically feasible to construct guiding walls, forming a contraction, which accelerate the attraction flow and generate a concentrated turbulent jet with a higher velocity, while keeping the flow rate unchanged. The attraction flow penetrates about half-way (70 m) into the main flow and reaches the position where most fish are positioned according to fish position measurements and therefore potentially has a good ability to attract upstream migrating fish. There is no negative impact on the water level in the confluence area and thereby not on electricity production. It was shown that the results can be scaled up to prototype conditions and the strategy can presumably be generalized to similar flow situations, existing at other hydropower plants, allowing for improved upstream fish migration in coexistence with a sound hydropower production.
VL  - 7
IS  - 2
ER  -

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Author Information

Kristian Angele

Vattenfall AB, Research and Development, Laboratories, ?lvkarleby, Sweden
Patrik Andreasson

Vattenfall AB, Research and Development, Laboratories, ?lvkarleby, Sweden
Ake Forssen

Vattenfall AB, Research and Development, Laboratories, ?lvkarleby, Sweden
David Aldven

Vattenfall AB, Research and Development, Laboratories, ?lvkarleby, Sweden
Gustav Hellstrom

Department of Wildlife, Fish and Environmental Studies, Umea, Swedish University of Agricultural Sciences, Uppsala, Sweden
Kjell Leonardsson

Department of Wildlife, Fish and Environmental Studies, Umea, Swedish University of Agricultural Sciences, Uppsala, Sweden

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APA Style

Kristian Angele, Patrik Andreasson, Ake Forssen, David Aldven, Gustav Hellstrom, et al. (2021). A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. American Journal of Water Science and Engineering, 7(2), 57-71. https://doi.org/10.11648/j.ajwse.20210702.14

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ACS Style

Kristian Angele; Patrik Andreasson; Ake Forssen; David Aldven; Gustav Hellstrom, et al. A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. Am. J. Water Sci. Eng. 2021, 7(2), 57-71. doi: 10.11648/j.ajwse.20210702.14

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AMA Style

Kristian Angele, Patrik Andreasson, Ake Forssen, David Aldven, Gustav Hellstrom, et al. A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. Am J Water Sci Eng. 2021;7(2):57-71. doi: 10.11648/j.ajwse.20210702.14

Copy | Download

@article{10.11648/j.ajwse.20210702.14,
  author = {Kristian Angele and Patrik Andreasson and Ake Forssen and David Aldven and Gustav Hellstrom and Kjell Leonardsson},
  title = {A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow},
  journal = {American Journal of Water Science and Engineering},
  volume = {7},
  number = {2},
  pages = {57-71},
  doi = {10.11648/j.ajwse.20210702.14},
  url = {https://doi.org/10.11648/j.ajwse.20210702.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajwse.20210702.14},
  abstract = {A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and by-pass the case study hydropower plant, it must be able to localize the attraction flow where it enters the main flow from the tailrace of the hydropower plant in the so-called confluence area. Here the comparatively small and limited attraction flow from the old river channel must be improved in order to be able compete with the substantially larger main flow. The objective of the present study is to investigate the feasibility of a new concept for further improvement of the attraction flow using guiding walls forming a contraction channel. Field measurements were performed tracing tagged fish in the confluence area downstream of the case study hydropower plant in order to understand the movement pattern of the fish. Based on the results, and results from bathymetry measurements in the same area, a physical scale model was constructed where it was experimentally demonstrated that it is hydraulically feasible to construct guiding walls, forming a contraction, which accelerate the attraction flow and generate a concentrated turbulent jet with a higher velocity, while keeping the flow rate unchanged. The attraction flow penetrates about half-way (70 m) into the main flow and reaches the position where most fish are positioned according to fish position measurements and therefore potentially has a good ability to attract upstream migrating fish. There is no negative impact on the water level in the confluence area and thereby not on electricity production. It was shown that the results can be scaled up to prototype conditions and the strategy can presumably be generalized to similar flow situations, existing at other hydropower plants, allowing for improved upstream fish migration in coexistence with a sound hydropower production.},
 year = {2021}
}

Copy | Download

TY  - JOUR
T1  - A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow
AU  - Kristian Angele
AU  - Patrik Andreasson
AU  - Ake Forssen
AU  - David Aldven
AU  - Gustav Hellstrom
AU  - Kjell Leonardsson
Y1  - 2021/06/04
PY  - 2021
N1  - https://doi.org/10.11648/j.ajwse.20210702.14
DO  - 10.11648/j.ajwse.20210702.14
T2  - American Journal of Water Science and Engineering
JF  - American Journal of Water Science and Engineering
JO  - American Journal of Water Science and Engineering
SP  - 57
EP  - 71
PB  - Science Publishing Group
SN  - 2575-1875
UR  - https://doi.org/10.11648/j.ajwse.20210702.14
AB  - A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and by-pass the case study hydropower plant, it must be able to localize the attraction flow where it enters the main flow from the tailrace of the hydropower plant in the so-called confluence area. Here the comparatively small and limited attraction flow from the old river channel must be improved in order to be able compete with the substantially larger main flow. The objective of the present study is to investigate the feasibility of a new concept for further improvement of the attraction flow using guiding walls forming a contraction channel. Field measurements were performed tracing tagged fish in the confluence area downstream of the case study hydropower plant in order to understand the movement pattern of the fish. Based on the results, and results from bathymetry measurements in the same area, a physical scale model was constructed where it was experimentally demonstrated that it is hydraulically feasible to construct guiding walls, forming a contraction, which accelerate the attraction flow and generate a concentrated turbulent jet with a higher velocity, while keeping the flow rate unchanged. The attraction flow penetrates about half-way (70 m) into the main flow and reaches the position where most fish are positioned according to fish position measurements and therefore potentially has a good ability to attract upstream migrating fish. There is no negative impact on the water level in the confluence area and thereby not on electricity production. It was shown that the results can be scaled up to prototype conditions and the strategy can presumably be generalized to similar flow situations, existing at other hydropower plants, allowing for improved upstream fish migration in coexistence with a sound hydropower production.
VL  - 7
IS  - 2
ER  -

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