Numerical study of the effect of a V‐shaped weir on turbulence characteristics and velocity in <scp>V‐weir</scp> fishways

Shahabi, Maryam; Ahadiyan, Javad; Ghomeshi, Mehdi; Narimousa, Marjan; Katopodis, C; Nadian, Hossein Azizi

doi:10.1002/rra.4064

Cited by 4 publications

(2 citation statements)

References 56 publications

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“…Several types of fishways have been studied to assist fish in reaching upstream habitats (Helbig et al, 2021; Mensinger et al, 2021; Shahabi et al, 2023). However, no fishway suits all dams and weirs.…”

Section: Discussionmentioning

confidence: 99%

Preferential behavior of Tribolodon hakonensis for fishways according to biological characteristics

Masumoto

Nakai²,

Asaeda

et al. 2023

River Research & Apps

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In 2012, the fishway in the Miyanaka Intake Dam in Niigata Prefecture, Japan, was reconstructed and divided into three fishways (ice‐harbor‐, stair‐, and rock‐ramp‐type) with different flow velocities and water depths. We conducted an adaptive monitoring survey in these fishways from 2012 to 2020, and 33 fish types were found, including migratory, swimming, small swimming, and benthic fishes. Many species displayed a preference for specific fishways. The run‐up for Tribolodon hakonensis was studied to determine the effects of physical parameters such as body length, rush speed for instantaneous swimming, water temperature, and presence/absence of nuptial coloration on fishway preference. T. hakonensis with nuptial coloration had greater body length and higher rush speeds than those without it. They also preferred the ice‐harbor fishway, whereas their shorter, uncolored counterparts preferred the stair and rock‐ramp alternatives. The environmental conditions selected by T. hakonensis changed according to their growth stage, as did fishway preference. Changes in fishway environmental conditions may have influenced the observed differences in fishway populations. It was thus confirmed that developing fishways with different flow velocities and water depths is effective in supporting the various life stages of T. hakonensis.

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Section: Discussionmentioning

confidence: 99%

Preferential behavior of Tribolodon hakonensis for fishways according to biological characteristics

Masumoto

Nakai²,

Asaeda

et al. 2023

River Research & Apps

View full text Add to dashboard Cite

show abstract

“…In this study, the flow field numerical modelling of the tested fishway configurations was performed with FLOW-3D ® (Santa Fe, NM, USA) [53], a commercial 3D CFD model which has been widely used in recent years for fishway research, e.g., [54][55][56][57][58][59]. FLOW-3D ® uses the Finite Volume Method to solve the governing equations of motion for fluids in a Cartesian staggered grid to obtain transient, three-dimensional solutions to multiscale and multiphysics flow problems [53].…”

Section: Numerical Modellingmentioning

confidence: 99%

Debating the Rules: An Experimental Approach to Assess Cyprinid Passage Performance Thresholds in Vertical Slot Fishways

Romão,

Quaresma,

Simão

et al. 2024

Water

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Throughout the world, emerging barriers in river systems block longitudinal connectivity for migrating fish, causing significant impacts by precluding them from carrying out vital life cycle activities. Fishways are still the main mitigation solution implemented, where barrier removal is not feasible. Within the multiple technical fish passage devices, the vertical slot fishway (VSF) is considered the most reliable. Early design guidelines, established for cyprinids, indicate that the volumetric dissipation power (Pv) in the pools should be Pv < 150 Wm−3, while most frequent slope values range from 10 to 12%. In this study, an experimental approach was conducted to question and debate the validity of these recommendations. For this, the Iberian barbel (Luciobarbus bocagei, Steindachner, 1864) passage performance was assessed in a full-scale fishway that exceeded Pv design guidelines, under different configurations. These varied in discharge (Q) and mean pool water depth (hm): VSF1 (Q = 81 Ls−1; hm = 0.55 m); VSF2 (Q = 110 Ls−1; hm = 0.80 m); and the same design was equipped with a deep notch: DN1 (Q = 71 Ls−1; hm = 0.55 m); DN2 (Q = 99 Ls−1; hm = 0.80 m). The slope was set to 15.2% while the head drop per pool was Δh = 0.28 m, which generated a Pv that ranged from 222 in VSF1 to 187 Wm−3 in DN2. Passage behaviour was assessed using PIT telemetry and time-to-event analysis to evaluate the barbel upstream passage using standardized metrics: (i) motivation (ii) ascend success, and (iii) transit time. The hydrodynamic scenarios experienced by fish were characterized through a numerical model using computational fluid dynamics (CFD). The results, contrary to what was expected, showed a higher performance in VSF1 confirmed by the ascent analysis and transit time. Although no differences were found in fish motivation, the results indicate that larger fish displayed lower times to perform the first passage attempt. The CFD results show that, although maximum velocities and turbulence (turbulent kinetic energy (TKE) and Reynolds shear stress (RSS)) do not change significantly between configurations, their distribution in the pools is quite different. Regarding TKE, larger volumes with magnitudes higher than 0.05 m2s−2 were notorious in both DN1 and DN2 configurations compared to VSF1, influencing passage efficiency which is in line with the ascent and transit time metrics results. Overall, the present research undeniably debates the literature design guidelines and reinforces the need to jointly assess species-specific fish passage criteria and fishway hydrodynamics, whereas precaution should be taken when using very general recommendations.

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Computational fluid dynamics in fishway research - a systematic review on upstream fish passage solutions

Tarena,

Nyqvist,

Katopodis

et al. 2024

Journal of Ecohydraulics

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Numerical study of the effect of a V‐shaped weir on turbulence characteristics and velocity in V‐weir fishways

Cited by 4 publications

References 56 publications

Preferential behavior of Tribolodon hakonensis for fishways according to biological characteristics

Preferential behavior of Tribolodon hakonensis for fishways according to biological characteristics

Debating the Rules: An Experimental Approach to Assess Cyprinid Passage Performance Thresholds in Vertical Slot Fishways

Computational fluid dynamics in fishway research - a systematic review on upstream fish passage solutions

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