Modeling of Flow in a Weir and Pool Fishway With Orifices for Optimizing the Fishway Design

Abeyratne, W. M. L. K.; Weerasinghe, P. S.; Weerakoon, S. B.

doi:10.1007/978-981-15-5183-3_56

Cited by 2 publications

(3 citation statements)

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“…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%

“…In general, fishways with lower slopes are more suitable as they require lower fish speed (Abeyratne et al, 2020). Therefore, considering that in the three slopes investigated, the maximum velocity was less than 1 m/s, and the average value of TKE was less than 0.05 J/kg, all three may be suitable for most species.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, considering that in the three slopes investigated, the maximum velocity was less than 1 m/s, and the average value of TKE was less than 0.05 J/kg, all three may be suitable for most species. However, the importance of installing economically efficient fishways, implies that a 10% slope may be a suitable and optimal choice for most species (Abeyratne et al, 2020).…”

Section: Resultsmentioning

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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