Special Issue "Ecohydraulics of Pool-Type Fishways"

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydraulics and Hydrodynamics".

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editors

Prof. Dr. António Pinheiro
Website
Guest Editor
Instituto Superior Téchnico, Lisbon, Portugal
Special Issues and Collections in MDPI journals
Dr. Ana L. Quaresma
Website
Guest Editor
CERIS - Civil Engineering Research and Innovation for Sustainability
Interests: Fishways; Ecohydraulics; Computational Fluid Dynamics (CFD); Acoustic Doppler Velocimetry (ADV); Particle Image Velocimetry (PIV); River connectivity; Hydraulics and Water resources; River restoration and management
Dr. Filipe Romão
Website
Guest Editor
CERIS - Civil Engineering Research and Innovation for Sustainability
Interests: River restoration and management; River connectivity; Ecohydraulics; Fishways; Fish migration; Fisheries management; Freshwater biology

Special Issue Information

Dear Colleagues,

Fishways are hydraulic structures that mitigate the negative effects of anthropogenic barriers in rivers by allowing fish to move upstream and downstream, thus restoring longitudinal connectivity.

Pool-type fishways are one of the oldest, most widespread types of fishway. They may present different configurations, from the alternate deep notch and submerged orifice design, which needs relatively low discharge to operate, to the vertical slot fishway, which is considered the best technical fishway type when multiple species are targeted, allowing fish to negotiate the slots at their desired depth. Recently, the concepts of double or multi-slot fishways, that reduces the discharge needed to operate, has been applied and developed.

In each of these fishway types, problems regarding attraction, passage, and maintenance are key aspects for the success of the fishway that still require extensive research, application, and monitoring.

Overall, the objective of a fishway is restoring connectivity. Therefore, pool-type fishways should desirably approach the holistic concept, allowing the fish community, or at least the key species, to overcome the barrier.

Recent developments of the methods, tools, and devices to assess fish passage behavior and to measure and simulate the hydrodynamic conditions downstream and along the fishway allow for new insights in the design of these ecohydraulic structures and motivate this Special Issue.

Prof. Dr. António Pinheiro
Dr. Ana L. Quaresma
Dr. Filipe Romão
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Pool-orifice-weir fishway
  • Vertical slot fishway
  • Multi-slot fishway
  • CFD modelling
  • Attractiveness
  • Effectiveness
  • Efficiency
  • Monitoring
  • Retrofitting

Published Papers (3 papers)

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Research

Open AccessArticle
Design and Function Monitoring of an Enature® Vertical Slot Fish Pass in a Large Potamal River in Carinthia/Austria
Water 2020, 12(2), 551; https://doi.org/10.3390/w12020551 - 15 Feb 2020
Cited by 1
Abstract
To establish good ecological status in European rivers, firstly there is the question of how to re-establish unhindered migration for fish at barriers. This article documents a project to re-establish longitudinal connectivity at a large epipotamal river at the Schwabeck Hydro Power Plant, [...] Read more.
To establish good ecological status in European rivers, firstly there is the question of how to re-establish unhindered migration for fish at barriers. This article documents a project to re-establish longitudinal connectivity at a large epipotamal river at the Schwabeck Hydro Power Plant, Carinthia/Austria, from the selection of an appropriate fish pass system to the final function control. Instead of a standard vertical slot, the innovative enature® fish pass shape with a significant reduction of flow, velocities, energy dissipation rate, and turbulences, but with a clear enhancement of fish passage capability, was chosen. Using 2D hydraulic modelling and a statistical evaluation of fish passage, physical and ecological effects were reviewed, with the clear result that there is no identifiable, positive ecological effect on the number of fish migrating with an increase of concurrent flow in the fish pass. Passability and findability were monitored with the new FishCam, an automatic, precise, and constant (24/7 24 h a day, seven days a week) collection and pre-evaluation field data survey method which does not involve trapping of, contact with, or stress for fish. It was shown that the enature® fish pass enables an unhindered migration for all available fish species. As >99% of fish migrate from April to November, there is no ecological need to operate a fully functional fish pass year-round. Combining all the individual factors together, the fish pass at the Schwabeck Hydro Power Plant is an almost exemplary solution for a fully functioning restauration of the continuum with a minimized loss of generation of electricity. Full article
(This article belongs to the Special Issue Ecohydraulics of Pool-Type Fishways)
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Open AccessFeature PaperArticle
A Cone Fishway Facilitates Lateral Migrations of Tropical River-Floodplain Fish Communities
Water 2020, 12(2), 513; https://doi.org/10.3390/w12020513 - 13 Feb 2020
Abstract
Fisheries in many tropical river-floodplain systems are under threat from physical obstructions caused by ongoing river infrastructure development. There is a growing need for innovative, cost-effective technologies to mitigate the impacts of these obstructions. This study examined the effectiveness of a new cone [...] Read more.
Fisheries in many tropical river-floodplain systems are under threat from physical obstructions caused by ongoing river infrastructure development. There is a growing need for innovative, cost-effective technologies to mitigate the impacts of these obstructions. This study examined the effectiveness of a new cone fishway for facilitating lateral migrations of river-floodplain fish communities in the Lower Mekong Basin in Lao PDR. We assessed the species richness, size range, abundance and biomass of fish able to pass through a cone fishway, using paired entrance and exit sampling during both dawn/day and dusk/night. Overall, a diverse range of taxa (76 species) and size classes (25–370 mm) ascended the cone fishway. The total size range of fishes observed at the fishway entrance was similar to that at the exit, although the fish at the entrance were significantly smaller (in length) than those at the exit, during both diel periods. Additionally, there were significantly higher abundances of fish at the entrance than at the exit, but there was no difference in total biomass, again for both periods. These results suggest that, with further development, the cone fishway design has considerable potential for facilitating the lateral migrations of diverse tropical river-floodplain fish communities at low/medium head infrastructure. Full article
(This article belongs to the Special Issue Ecohydraulics of Pool-Type Fishways)
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Open AccessFeature PaperArticle
Passage Performance of Technical Pool-Type Fishways for Potamodromous Cyprinids: Novel Experiences in Semiarid Environments
Water 2019, 11(11), 2362; https://doi.org/10.3390/w11112362 - 11 Nov 2019
Cited by 1
Abstract
Endemic freshwater fish from semiarid environments are among the most threated species in the world due to water overexploitation and habitat fragmentation problems. Stepped or pool-type fishways are used worldwide to reestablish longitudinal connectivity and mitigate fish migration problems. Many of them are [...] Read more.
Endemic freshwater fish from semiarid environments are among the most threated species in the world due to water overexploitation and habitat fragmentation problems. Stepped or pool-type fishways are used worldwide to reestablish longitudinal connectivity and mitigate fish migration problems. Many of them are being installed or planned in rivers of semiarid environments, however, very few studies about fish passage performance through pool-type fishways has been carried out to date on these regions. The present work focuses on the passage performance of two potamodromous cyprinids endemic of these regions, with different ecological and swimming behavior: southern Iberian barbel (Luciobarbus sclateri) and Iberian straight-mouth nase (Pseudochondrostoma polylepis). These are assessed in two of the most common types of stepped fishways: vertical slot and submerged notch with bottom orifice fishways. Experiments were carried out during the spawning season in the Segura River (southeastern Spain), using a passive integrated transponder (PIT) tag and antenna system. Ascent success was greater than 80%, with a median transit time lower than 17 minutes per meter of height in all trials, and for both species and fishway types. Results show that both types of fishways, if correctly designed and constructed, provide interesting alternatives for the restoration of fish migration pathways in these regions. Full article
(This article belongs to the Special Issue Ecohydraulics of Pool-Type Fishways)
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