Designs for T Shape Fishways

Mao, Xi; Zhang, Jiehao; Tang, Kai; Zhao, Weiyang

doi:10.14311/cej.2019.02.0022

Cited by 3 publications

(6 citation statements)

References 10 publications

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“…Q = 400 L/s, 600 L/s, 800 L/s and 1000 L/s). observed and only small discrepancy exists between the present TSF-1 and the TSF case proposed by Mao et al (2019). Besides, whether for TSF-1 or for HSF-2, both the normalized locations and the normalized values of the maximum depthmean time-averaged velocity magnitude in different Y-Z planes almost remain unchanged when changing the discharge.…”

Section: Different Operating Conditionscontrasting

confidence: 47%

“…This study is dedicated to proposing a novel H-shape fishway during the process of optimizing the original T-shape fishway (i.e. TSF-1) designed by Mao et al (2012Mao et al ( , 2019. The equal-proportional scaling has been carried out on the X-Y plane, with the purpose of ensuring that TSF-1 has the same width as VSF.…”

Section: Research Scopementioning

confidence: 99%

“…However, researchers found that smaller non-salmon species have difficulties passing through fishways with high velocity and turbulent kinetic energy (Quaresma et al, 2018). In order to reduce both the velocity magnitude and the turbulent kinetic energy within the pool, the T-shape fishway (Mao et al, 2012;Mao et al, 2019) was recently introduced providing a friendly hydrodynamic environment for fishes with relatively smaller sizes or with relatively weaker swimming and jumping capacities. The Tshape fishway (TSF), designed by Mao et al (2012), consists of two symmetric lateral long baffles, one central T-shape pier, and two symmetric drop sills, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, being similar to VSF, the vertical-slot of TSF extends through the entire height of the pool, and therefore TSF can be suitable to fishes preferring to swim at different water depths. Mao et al (2012Mao et al ( , 2019 simplified the T-shape fishway by removing the two drop This paper aims to firstly optimize the vertical-slot width of the T-shape fishway by making a comparison of four TSF cases (i.e. TSF-1, TSF-2, TSF-3 and TSF-4).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A novel H-shape fishway with excellent hydraulic characteristics

Zhang

Liu

Shi

et al. 2023

Journal of Hydrology and Hydromechanics

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Fishway design not only takes into account the swimming abilities of target fishes, but also considers the hydrodynamic characteristics within the fishway. In this study, the flow fields of one vertical-slot fishway (i.e. VSF), five T-shape fishways (i.e. TSF-1~TSF-5) and two H-shape fishways (i.e. HSF-1 and HSF-2) are numerically simulated by solving the three-dimensional Reynolds-averaged Navier-Stokes equations and the K-Omega-SST turbulence model. The numerical results clearly indicate that the hydrodynamic properties of HSF-2 are overall superior to the remaining seven cases, in terms of the time-averaged flow pattern, the time-averaged velocity magnitude, the depth-mean time-averaged velocity magnitude along the vertical-slot section, the volume percentages of the time-averaged velocity magnitude less than some critical values, and the distribution of the time-averaged turbulent kinetic energy. Therefore, HSF-2 is more friendly for fishes with relatively smaller sizes and weaker swimming capacities to transfer upstream. The novel HSF-2 is firstly proposed in this paper, and it is naturally designed during the process of improving the flow regime. Furthermore, the generalizability of the superiority of HSF-2 over VSF and the original T-shape fishway (i.e. TSF-1) has been exhibited with the aid of the numerical results of four operating conditions (i.e. Q = 400 L/s, 600 L/s, 800 L/s and 1000 L/s).

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Section: Different Operating Conditionscontrasting

confidence: 47%

Section: Research Scopementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel H-shape fishway with excellent hydraulic characteristics

Zhang

Liu

Shi

et al. 2023

Journal of Hydrology and Hydromechanics

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“…When the water flow suddenly encounters a solid boundary, the distribution of flow velocities throughout the flow section changes rapidly. This concentrated resistance in a small area is known as local resistance [11]. The effects of local resistance on head loss in the fishway water flow were calculated using the following equation:…”

Section: Mainstream Flow Velocity and Overall Velocitymentioning

confidence: 99%

The Hydraulics of Nature-Like Fishways

Mao

Huang²,

Xu³

et al. 2021

CEJ

Self Cite

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Nature-like fishway arrangements are commonly used because these structures imitate the characteristics of natural rivers and effectively allow fish to migrate past river sections blocked by hydraulic structures. In this paper, physical models were analyzed, and the velocity distributions of two different fishway structures (Types I and II) were compared. Results showed that the maximum mainstream velocity of the Type I structure was 5.3% lower than that of the Type II structure. However, the average mainstream velocity of the Type I structure was 21.1% greater than that of the Type II structure. The total per-cycle length of the mainstream path in the Type II structure was 2.1 times greater than that of the Type I structure, which indicated that the length of the mainstream path was somewhat proportional to the average velocity of the mainstream. When the flow rate was kept constant, increases in the velocity of the main flow associated with changes in the internal structure of the fishway decreased the average velocity of the main flow, while decreases in the total length of the flow path led to increases in the average velocity of the main flow. Due to frictional head loss along the fishway and local head loss, as well as the overlaps between these factors, the overall flow rate gradually decreased every cycle, despite periodic fluctuations.

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Design of a bilateral‐symmetric multi‐slot fishway and its comparison with vertical slot fishway in terms of hydraulic properties

Zhang

Bian

Shi

et al. 2023

River Research & Apps

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Aiming at improving the hydraulic properties and enhancing the fish passage efficiency, this study proposes a novel bilateral‐symmetric multi‐slot fishway (BMSF) by combining the structural features of a double‐sided vertical‐slot fishway, multi‐slot fishway and T‐shape fishway. Eight BMSF cases are further designed by adjusting the slot width and the distance between the short baffle and the front end of the central wall, in order to achieve the relatively best hydrodynamic characteristics. The flow fields of two vertical‐slot fishways and eight BMSF fishways are obtained by numerically solving the Reynolds‐averaged Navier–Stokes equation, the volume‐of‐fluid equation and the k‐ω‐SST turbulence model. Numerical results manifest that the recommended BMSF‐8 provides the smallest values in terms of the maximum time‐averaged velocity magnitude (1.42 m s−1), the maximum time‐averaged turbulent kinetic energy (0.132 m2 s−2), the maximum time‐averaged Reynolds shear stress component (44 Pa), the spatial‐mean time‐averaged velocity magnitude (0.58 m s−1), and the spatial‐mean time‐averaged turbulent kinetic energy (0.042 m2 s−2) in the middle pool at Q = 1000 L/s. Even for the depth‐mean time‐averaged velocity magnitude at the slot and the volume percentages of some critical physical quantities, BMSF‐8 is also superior to the other cases. To sum up, BMSF‐8 leads to the relatively lowest flow velocity and turbulence, being more suitable for the passage of the whole fish community (especially for small‐sized fishes with weaker swimming ability). In addition, the generalizability of the aforementioned superiority of BMSF‐8 is displayed by providing the numerical results of four operating conditions (i.e., Q = 600, 800, 1000 and 1200 L/s).

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Designs for T Shape Fishways

Cited by 3 publications

References 10 publications

A novel H-shape fishway with excellent hydraulic characteristics

A novel H-shape fishway with excellent hydraulic characteristics

The Hydraulics of Nature-Like Fishways

Design of a bilateral‐symmetric multi‐slot fishway and its comparison with vertical slot fishway in terms of hydraulic properties

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