Home About Browse Search
Svenska


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

Angele, Kristian and Andreasson, Patrik and Forssen, Ake and Aldven, David and Hellström, Gustav and Leonardsson, Kjell (2021). A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow. American Journal of Water Science and Engineering. 7 , 57-71
[Research article]

[img] PDF
1MB

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.

Authors/Creators:Angele, Kristian and Andreasson, Patrik and Forssen, Ake and Aldven, David and Hellström, Gustav and Leonardsson, Kjell
Title:A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow
Series Name/Journal:American Journal of Water Science and Engineering
Year of publishing :2021
Volume:7
Page range:57-71
Number of Pages:15
ISSN:2575-1867
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Ocean and River Engineering
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Behavioural Sciences Biology
Keywords:attraction flow, salmon, fish migration, acoustic telemetry, physical scale model test, hydropower
URN:NBN:urn:nbn:se:slu:epsilon-p-115327
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-115327
Additional ID:
Type of IDID
DOI10.11648/j.ajwse.20210702.14
ID Code:26687
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: SLUpub Connector
Deposited On:12 Jan 2022 15:25
Metadata Last Modified:12 Jan 2022 15:31

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits