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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Physical and hydraulic forces experienced by fish passing through three different low-head hydropower turbines

Craig A. Boys https://orcid.org/0000-0002-6434-2937 A B E , Brett D. Pflugrath A , Melanie Mueller C , Joachim Pander C , Zhiqun D. Deng D and Juergen Geist C
+ Author Affiliations
- Author Affiliations

A New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, NSW 2316, Australia.

B Institute for Land Water and Society, Charles Sturt University, Elizabeth Mitchell Drive, Thurgoona, NSW 2640, Australia.

C Aquatic Systems Biology Unit, Department of Ecology and Ecosystem Management, Technical University of Munich, Mühlenweg 22, D-85354 Freising, Germany.

D Pacific Northwest National Laboratory, Richland, WA 99352, USA.

E Corresponding author. Email: craig.boys@dpi.nsw.gov.au

Marine and Freshwater Research 69(12) 1934-1944 https://doi.org/10.1071/MF18100
Submitted: 15 March 2018  Accepted: 12 June 2018   Published: 12 September 2018

Abstract

Knowing the kinds of physical stress experienced by fish passing through hydropower turbines can help optimise technologies and improve fish passage. This paper assesses the hydraulic conditions experienced through three different low-head turbines (a very low head (VLH), Archimedes screw and horizontal Kaplan turbine), taken using an autonomous sensor. In total, 127 Sensor Fish deployments were undertaken across all three turbines, generating 82 valid datasets. Decompression was rare at the VLH and screw turbines and rarely fell more than 10 kPa below atmospheric pressure. In contrast, the Kaplan was capable of generating pressures as low as 55.5 kPa (~45 kPa below atmospheric pressure), over shorter periods of time. More severe ratios of pressure changes could, therefore, be expected for both surface- and depth-acclimated fish at the Kaplan than at the other turbines. Strike was another possible source of fish injury (detected in 69–100% of deployments), and although strike severity was highest at the Kaplan, strike was more likely to be encountered at the screw and VLH than the Kaplan turbine. Shear occurred only near the blades of the Kaplan, and not at severe levels. The results demonstrated that low-head hydropower facilities are not without their risks for downstream migrating fish.

Additional keywords : Archimedes screw, fish injury, fish passage, horizontal Kaplan, Sensor Fish, VLH turbine.


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