Do fishways stress fish? Assessment of physiological and hydraulic parameters of rainbow trout navigating a novel W-weir fishway

Shahabi, Maryam; Ghomeshi, Mehdi; Ahadiyan, Javad; Mohammadian, Takavar; Katopodis, C

doi:10.1016/j.ecoleng.2021.106330

Cited by 5 publications

(15 citation statements)

References 40 publications

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“…However, an expanded zone of low TKE occurred at an angle of 40° between the central flow core and the sidewalls. A graph of TKE vs d/D (z = water depth, 0.02, 0.04, 0.06, and 0.08 m) which corresponds to a flow rate of 29 L/s, a slope of 4%, and angles of 22.5°, 40°, and 60° is shown in Figure 4 shows that TKE reaches higher values for the larger angles of 40° and 60° and with increased water depth, in a similar way to the W‐weir fishway (Shahabi et al, 2021). TKE reached maximum values from approximately d/D = 0.2 to the water surface for the 22.5° angle and from approximately d/D = 0.4 to the water surface for the larger angles of 40° and 60°.…”

Section: Resultsmentioning

confidence: 74%

“…Velocity (Figure 5) and TKE (Figure 5) changes with S = 4, 7, and 10%, for Q = 29 L/s, and a V‐weir angle of 22.5°, were examined. Generally, with pool and weir fishways, it is expected that maximum velocities and TKE values increase with higher slopes (Abeyratne, Weerasinghe, & Weerakoon, 2020; Ead et al, 2004; Li, Yang, et al, 2020; Shahabi et al, 2021). According to Figure 5, for a slope of 4%, the velocity distribution is evenly distributed in the pool.…”

Section: Resultsmentioning

confidence: 99%

“…This indicates that flow at the 7% slope reached its maximum turbulence, and the 10% slope does not cause a significant change in the TKE value. A fishway at 10% slope would be a more economical option at least for larger species and sizes, as a 4% slope was optimum to avoid stressing 15 cm long rainbow trout ( Oncorhynchus mykiss; Shahabi et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

“…The mathematical expression to calculate turbulent kinetic energy, TKE, uses

v_{x}^{'}

v_{y}^{'}

v_{z}^{'}

, which are the mean squared roots of the longitudinal (x), transverse (y), and vertical (z) velocity fluctuations, respectively. The time‐averaged value, estimated from the corresponding sample time (Shahabi et al, 2021), is defined as:

TKE = 0.5 [\overset{true¯}{{v^{'}}^{2}_{x}} + \overset{true¯}{{v^{'}}^{2}_{y}} + \overset{true¯}{{v^{'}}^{2}_{z}}]

…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the distribution of TI, TD, TKE, and RSS in the centre of the flume between two consecutive weirs was investigated (Li, Yang, Ma, & Li, 2020; Shahabi et al, 2021). TD was extracted according to the Kolmogorov similarity hypothesis, using water kinematic viscosity ν and turbulent dissipation

s_{italicij}

(Xu & Chen, 2013).…”

Section: Methodsmentioning

confidence: 99%

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

Shahabi

Ahadiyan

Ghomeshi

et al. 2022

River Research & Apps

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Fishways are used to allow fish to migrate around water infrastructure, whether movements are in the upstream or downstream direction. Hydrodynamic conditions within various fishways, including turbulence levels, are important for successful fish passage. A numerical hydrodynamic study was conducted for V-weir fishways, which assist species migrating upstream. The variables investigated included, fishway slopes of 4%, 7%, and 10%, relative spacing between weirs of 1.3, 2.6, and 4 (D/L, ratio of distance between weirs to pool width), and weir angles of 22.5 , 40 , and 60 . Turbulence characteristics, including turbulent kinetic energy (TKE), Reynolds shear stress (RSS), turbulent intensity (TI), turbulent dissipation (TD), as well as maximum water velocity, were examined by CFD (computational fluid dynamics) simulation using a re-normalized group or RNG turbulence model. The CFD was calibrated with flow measurements made in a physical model of the V-weir fishway in laboratory control experiments. Based on inferences from fish passage literature, the results showed that, in the range of parameters studied, a weir angle of 22.5 , a slope of 10% and relative spacing between weirs of 1.3 and 2.6 were assessed as offering the best potential performance for several species and sizes of fish, while the latter has lower cost as it requires fewer weirs. The V-weir fishway may be adaptable for smaller fish.

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The mathematical expression to calculate turbulent kinetic energy, TKE, uses

v_{x}^{'}

v_{y}^{'}

v_{z}^{'}

TKE = 0.5 [\overset{true¯}{{v^{'}}^{2}_{x}} + \overset{true¯}{{v^{'}}^{2}_{y}} + \overset{true¯}{{v^{'}}^{2}_{z}}]

…”

Section: Methodsmentioning

confidence: 99%

s_{italicij}

(Xu & Chen, 2013).…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

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

Shahabi

Ahadiyan

Ghomeshi

et al. 2022

River Research & Apps

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Investigation of turbulent flows using spillway models aiming to aid downstream migration of fish

Shirinzad

Kumahor

Tachie

et al. 2023

River Research & Apps

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Dams and other flow control structures constitute obstacles to upstream and downstream aquatic habitats, reducing life‐cycle success and even eliminating diadromous and potamodromous fish species from river basins. Providing effective passage past hydroelectric dams is critical for restoring habitat connectivity and sustaining populations of fish species. Surface water release over spillways is effective in diverting fish from turbines and establishing a safe bypass for downstream migrants. Developing an effective passage system over spillways requires both biological knowledge of fish behavior and abilities, as well as hydraulic knowledge of spillway flows to provide hydrodynamic conditions that fish may exploit. The present study experimentally investigates several depths, velocity, and turbulence fields intended to promote the downstream migration of fish over spillways. Instantaneous velocity fields were measured in an open recirculating rectangular water channel. A 90° standard spillway model, as well as a spillway model with a modified upstream face slope of 45°, were tested for two water depths. The results show the presence of a distinct recirculation bubble at the heel of the 90° standard spillway with the shallower water depth. It was concluded that the upstream recirculation bubble may be suppressed by either increasing the water depth or decreasing the upstream face slope. Decreasing the upstream face slope also resulted in a more uniform distribution of acceleration and lower turbulence along the upstream face of the spillway. The modified spillways provide more suitable hydrodynamic conditions for downstream migrants.

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Comprehensive study of the hydrodynamic effects of weirs installed in the bypass of bar rack systems to better guide downstream migrating fish

Aleyasin,

Fang,

Tachie

et al. 2024

Ecological Engineering

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Do fishways stress fish? Assessment of physiological and hydraulic parameters of rainbow trout navigating a novel W-weir fishway

Cited by 5 publications

References 40 publications

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

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

Investigation of turbulent flows using spillway models aiming to aid downstream migration of fish

Comprehensive study of the hydrodynamic effects of weirs installed in the bypass of bar rack systems to better guide downstream migrating fish

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