Experimental study of the influence of macro-roughnesses on vertical slot fishway flows

Ballu, Aurélien; Calluaud, Damien; Pineau, G.; Lee, David

doi:10.1051/lhb/2017011

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Results from the present study supports the research of Liao et al (; Liao, ) indicating that the critical swimming speed of fish increased markedly under turbulent flow created by a vertical cylinder. Similar results were also reported in studies conducted in a vertical slot fishway fitted with bottom roughness elements such as vertical cylinders, which were considered an effective method to reduce flow velocities and improve passage of fish species with limited swimming ability (Ballu, Calluaud, Pineau, & David, ; Calluaud, Pineau, Texier, & David, ; Santos et al, ; Santos et al, ). However, the results of the current study are in contrast to those of Tritico and Cotel (), who found that critical swimming speed significantly decreased in the presence of a vertical cylinder.…”

Section: Discussionsupporting

confidence: 80%

Effect of a vertical half cylinder on swimming of silver carp,Hypophthalmichthys molitrix: Implications for microhabitat restoration and fishway design

Shi

Jiang

et al. 2019

River Research & Apps

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In recent years, the relationship between hydraulics associated with the substrate and fish swimming behaviour has become increasingly important to the design of microhabitat around substrates for river restoration. To better understand the hydraulics associated with substrate on fish swimming, we studied the effects of a vertical half cylinder (hereafter, cylinder) on the critical swimming speed of juvenile silver carp (Hypophthalmichthys molitrix). Absolute and relative critical swimming speeds of fish in the flow field of the cylinder were significantly increased compared with those swimming in free flow. In addition, the amplitude of fish head and tail oscillations were significantly greater in flows created by the half cylinder. This study highlights the importance of roughness elements in stream microhabitat restoration and, possibly, for fishway design.

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Section: Discussionsupporting

confidence: 80%

Effect of a vertical half cylinder on swimming of silver carp,Hypophthalmichthys molitrix: Implications for microhabitat restoration and fishway design

Shi

Jiang

et al. 2019

River Research & Apps

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show abstract

“…There are two types of fishways: technical fishways and nature-like fishways. At present, many scholars have studied the technical fishway, especially for the vertical-slot fishway; they have mainly studied the flow characteristics of the common pool or the turning pool [ 7 , 8 , 9 ], and analyzed the effects of pool geometry changes such as the length and width of the pool, the layout of the vertical slots, the bottom slope and the macro-roughness on the flow conditions [ 10 , 11 , 12 , 13 , 14 ]. For the complex turbulent flow in the vertical-slot fishway, researchers also used more sophisticated turbulent models such as the detached eddy simulation and the large eddy simulation to study the velocity and eddy [ 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Parameters of Pool Geometry on Flow Structure in Nature-like Fishway

Wang

Zhu

et al. 2022

IJERPH

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Many uncertainties such as variable irregular structure and complex flow conditions bring difficulties to the design of a nature-like fishway. This study defines the main factors and parameters affecting flow conditions such as permeability ratio, offset ratio, bottom slope and pool length to simplify and generalize the irregular geometry of the nature-like fishway. According to the engineering requirements of the Mopiling nature-like fishway, the effect of the above parameters of pool geometry on the flow structure is investigated through a 3D turbulent numerical simulation, and the parameter thresholds are summarized according to the optimization of the flow conditions. The results show that under the same conditions, the maximum velocity of the control section increases with the increase in permeability ratio, bottom slope and pool length, and the offset ratio has limited effect on the maximum velocity of the control section. It is recommended that when the bottom slope is 1/250 and the pool length is 10 m, the permeability ratio should not be greater than 0.30 and the offset ratio should be located between 0.15 and 0.60. When the bottom slope is adjusted to 1/200, it is recommended to control the permeability ratio below 0.20, the offset ratio between 0.30 and 0.60, and the pool length can be adjusted to 8 m. Within the above threshold range of the design parameters, the maximum velocity in the fishway can be basically controlled at about 1.0 m/s. The mainstream in the pool is clear and the flow pattern is good, which can basically satisfy the requirements of fish passing. The relevant design parameters and optimization strategies can provide reference for similar projects.

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“…Providing suitable swimming conditions for multiple fish species is rather challenging since the flow and turbulence patterns in fishways play a major role in their success [2,[4][5][6][7][8][9][10][11][12]. Physical modelling has been the main approach to study the hydrodynamics of pool-type fishways (e.g., [13][14][15][16][17][18][19][20][21][22]). However, physical experiments are expensive and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Pool-Type Fishways Flows: Efficiency and Scale Effects Assessment

Quaresma

Pinheiro

2021

Water

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In this study, the 3D numerical modelling of flow in a pool-type fishway with bottom orifices was performed using computational fluid dynamics (CFD) software (FLOW-3D®). Numerical results were compared with experimental data obtained from acoustic Doppler velocimetry (ADV) and particle image velocimetry (PIV) measurements. Several hydrodynamic variables that influence fishways efficiencies, such as flow depths, flow patterns, water velocity, turbulent kinetic energy, Reynolds normal stresses, and Reynolds shear stress parallel to the bottom component, were qualitatively and quantitatively compared. The numerical model accurately reproduced the complex flow field, showing an overall good agreement between the numerical model predictions and the experimental data for the analysed variables. The importance of performing a numerical model validation for all the parameters under analyses was highlighted. Additionally, scaling effects were analysed by running an upscaled numerical model of the prototype fishway. The model performed with similar accuracy for both physical model and prototype dimensions with no evidence of scale effects. The present study concludes that CFD models (namely FLOW-3D®) may be used as an adequate and efficient design and analysis tool for new pool-type fishways geometries, reducing and complementing physical model testing.

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Experimental study of the influence of macro-roughnesses on vertical slot fishway flows

Cited by 8 publications

References 11 publications

Effect of a vertical half cylinder on swimming of silver carp,Hypophthalmichthys molitrix: Implications for microhabitat restoration and fishway design

Effect of a vertical half cylinder on swimming of silver carp,Hypophthalmichthys molitrix: Implications for microhabitat restoration and fishway design

Effect of Parameters of Pool Geometry on Flow Structure in Nature-like Fishway

Modelling of Pool-Type Fishways Flows: Efficiency and Scale Effects Assessment

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