Rock-weir fishway I: flow regimes and hydraulic characteristics

Baki, Abul Basar M.; Zhu, David Z.; Harwood, Andrew; Lewis, Adam; Healey, Katie

doi:10.1080/24705357.2017.1369182

Cited by 28 publications

(26 citation statements)

References 45 publications

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“…Ghalandari et al (2019) combine a boundary element and finite element methods to investigate the sloshing in tanks with flexible submerged structures. For fishway studies, numerical methods are also an efficient tool in examinations of the hydraulic behaviors (Baki et al, 2017b, Chorda et al, 2010, Katopodis, 2015, Khan, 2006, Puertas et al, 2012, Wang et al, 2010. The present numerical model is verified against the experimental data from the conventional fishway tested by Ead et al (2004).…”

Section: Introductionmentioning

confidence: 71%

“…Equivalent to physical model tests, numerical modeling is an effective way to study fishway hydraulics (Li et al, 2020, Marriner et al, 2014, Xu and Jin, 2014. Investigations (Baki et al, 2016, Baki et al, 2017b, Bombač et al, 2014, Naghavi et al, 2011 have indicated the robustness of the k-turbulence model. Its governing equations are as follows.…”

Section: Governing Equationsmentioning

confidence: 99%

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Flow features in a pooled fishway with V-shaped weir formation

Yang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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A pooled fishway is an artificial structure to improve the river flow connectivity and facilitate fish migration. Its conventional layout is characterized by straight weirs and suffers from limited passage rate. To improve its flow behaviors, an alternative design, featuring a V-shaped weir arrangement, is devised. CFD simulations are performed to examine its effects on the flow conditions. The governing geometrical parameters include weir angling, height, and spacing. Depending on weir arm angle, the flow is directed towards either the channel's central part or the sidewalls, leading to both acrossand along-channel differences in flow velocity and turbulent kinetic energy. This offers conducive zones for multiple fish species with distinct swimming preferences. For a given location in a pool, the cross-sectional velocity exhibits a cosine-type variation; a relationship is established to predict the maximum longitudinal velocity. The pressure distribution exhibits a similar pattern, with highpressure areas residing upstream of the weir. A power law describes the relationship between the energy dissipation rate and unit discharge with an exponent at approximately 2/3. With an increase in either weir spacing or height, the energy dissipation rate declines. A change in weir angle shows however a negligible influence on it.

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Section: Introductionmentioning

confidence: 71%

Section: Governing Equationsmentioning

confidence: 99%

Flow features in a pooled fishway with V-shaped weir formation

Yang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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“…The hydraulic performance of weir‐pool fishways to support fish migration is governed by geometrical consideration, hydraulic characteristics, and swimming modes of fish species. Different flow regimes were introduced in the literature to classify the weir‐pool fishways based on the swimming modes of fishes (Branco, Santos, Katopodis, Pinheiro, & Ferreira, ; Fuentes‐Pérez, Sanz‐Ronda, de Azagra, & García‐Vega, ) and hydraulic characteristics of flow (Baki, Zhu, Harwood, Lewis, & Healey, ; Ead, Katopodis, Sikora, & Rajaratnam, ; Rajaratnam, Katopodis, & Mainali, ).…”

Section: Introductionmentioning

confidence: 99%

“…A great number of designs were introduced in the literature to improve the performance of weir‐pool fish passages and to adapt fishways for a variety of species. Having a constant discharge, the total head on the weir can be decreased by (a) increasing the weir length, (b) splitting the overall discharge through weir, slot, and orifice flows (Azimi & Rajaratnam, ; Salehi & Azimi, ), (c) diverting the discharge over and around obstacles to construct natural‐like rock‐pool fishways (Baki, Zhu, et al, ; Baki, Zhu, Harwood, Lewis, & Healey, ; Muraoka, Nakanishi, & Kayaba, ), and (d) improving the hydrodynamic condition in the pool by changing the pool geometry and introducing sills and boulders in the pool (Bermudez, Puertas, Cea, Pena, & Balairon, ; Bombač, Četina, & Novak, ; Pena, Puertas, Bermudez, Cea, & Pena, ; Santos, Branco, Katopodis, Ferreira, & Pinheiro, ). Many researchers improved the hydraulic performance of fishways by introducing notches, orifices, and slots to distribute the flow and reduce the total head (Branco et al, ; Fuentes‐Pérez et al, ; Guiny, Ervine, & Armstrong, ; Kim, ; Rajaratnam, Katopodis, & Mainali, ; Silva, Katopodis, Santos, Ferreira, & Pinheiro, ; Yagci, ).…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic and turbulence structure of triangular labyrinth weir‐pool fishways

Dizabadi

Azimi

2019

River Research & Apps

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Detailed laboratory experiments were conducted to analyze and evaluate a new weir-pool fishway design. The new design consisted of a series of one-cycle, triangular labyrinth weirs that formed a weir-pool fish passage. Hydraulic characteristics of flow over the proposed fishway were examined for three pool lengths and a wide range of discharges. It was found that the new design had superior discharge capacity over classical weir-pool fishways in plunging flow regime. Spatial and point analyses of measured velocity data were carried out to understand turbulence structure and distribution of turbulent flow. The power dissipation per unit volume was calculated for different tests, and it varied nonlinearly with discharge. Based on the limiting criteria for energy dissipation rates of different fish species, the maximum operating discharge for different slopes was extracted for the proposed design. The model-toprototype scaling analysis was performed based on the recommended scaling factor of three for prototype. It was found that the approach velocity of prototype increased by 12%, whereas the total discharge increased by more than five times.The contour plots of time-averaged velocity indicated that the proposed fishways offered diversified flow fields without exceeding the maximum velocity above the standards recommended for weir-pool fishways. To study the size, direction, and periodicity of turbulent eddies, magnitude of the most energetic eddy and dominant frequencies were extracted using power spectrum analysis. Quadrant analysis consistently showed that Reynolds shear stresses in ejection and sweep events became weaker as the pool length increased. The small region of strong ejection and sweep events evidenced a good resting place for fish migration, whereas the generated turbulence was large enough to attract fish species to use the passage. K E Y W O R D S energy dissipation, fishway, pool and weir fishway, power spectrum, quadrant analysis, Reynolds shear stress, turbulence

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Review on Nature-Like Step-Pool Fishways

Daksh,

Chandra

2024

Lecture Notes in Civil Engineering

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Rock-weir fishway I: flow regimes and hydraulic characteristics

Cited by 28 publications

References 45 publications

Flow features in a pooled fishway with V-shaped weir formation

Flow features in a pooled fishway with V-shaped weir formation

Hydraulic and turbulence structure of triangular labyrinth weir‐pool fishways

Review on Nature-Like Step-Pool Fishways

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