Abstract

Vertical-slot fishways (VSFs) are hydraulic structures which allow fish to swim around obstacles in rivers. These structures are subject to variations in discharge of either hydrological or operational origin, which result in nonuniform water depth profiles. These profiles are manifested as differences in the water drops across the slots (ΔH) and mean depths (h0) across the pools. Although nonuniform conditions are present in most VSFs, they are rarely considered in the design and evaluation of fishways. This study provides an introductory analysis of how nonuniform water depth profiles affect the hydrodynamics within the pools of VSFs. This study shows that flow patterns are controlled by changes in ΔH and h0 in addition to slope and other geometrical alterations, as previously suggested. Nonuniformity alters the flow structure in pools and the spatial distributions of hydrodynamic variables. Consequently, critical thresholds of hydrodynamic variables for fish may be reached in VSFs designed with recommended slopes when operating under nonuniform conditions.

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Acknowledgments

The research leading to these results received funding from the EU H2020 project FIThydro (No. 727830) and Estonian Research Council Grant IUT33-9. Filipe Romão (PD/BD/52512/2014) and Mario Eckert (PD/BD/114439/2016) were supported by a PhD grant from Fundação para a Ciência e Tecnolologia (FCT), Portugal. Paulo Branco was supported by a postdoctoral grant from FCT (SFRH/BPD/94686/2013). Forest Research Center (CEF) is a research unit funded by FCT (UID/AGR/00239/2013). Jeffrey A. Tuhtan’s contribution was financed by Estonian base financing Grant No. B53, Octavo, and ETAg PUT Grant 1690, Bioinspired flow sensing.

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Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 145Issue 2February 2019

History

Received: Mar 27, 2018
Accepted: Aug 17, 2018
Published online: Dec 7, 2018
Published in print: Feb 1, 2019
Discussion open until: May 7, 2019

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Junior Researcher, Centre for Biorobotics, Tallinn Univ. of Technology, Akadeemia tee 15A-111, Tallinn 12618, Estonia (corresponding author). ORCID: https://orcid.org/0000-0003-2384-9085. Email: [email protected]; [email protected]
J. A. Tuhtan [email protected]
D.Eng.
Group Leader, Centre for Biorobotics, Tallinn Univ. of Technology, Akadeemia tee 15A-111, Tallinn 12618, Estonia. Email: [email protected]
Ph.D. Student, Forest Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa 1349-017, Portugal. Email: [email protected]
F. Romão, Ph.D. [email protected]
Ph.D. Student, Civil Engineering for Research and Innovation for Sustainability, Instituto Superior Técnico, Universidade de Lisboa, Lisboa 1049-001, Portugal. Email: [email protected]
M. T. Ferreira, Ph.D. [email protected]
Profesor, Forest Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa 1349-017, Portugal. Email: [email protected]
M. Kruusmaa, Ph.D. [email protected]
Professor, Centre for Biorobotics, Tallinn Univ. of Technology, Akadeemia tee 15A-111, Tallinn 12618, Estonia. Email: [email protected]
P. Branco, Ph.D. [email protected]
Postdoctoral Researcher, Forest Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, Lisboa 1349-017, Portugal. Email: [email protected]

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