Mean Flow and Turbulence Structure in Vertical Slot Fishways

Liu, Minnan; Rajaratnam, N.; Zhu, David Z.

doi:10.1061/(asce)0733-9429(2006)132:8(765)

Cited by 107 publications

(100 citation statements)

References 18 publications

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“…At a distance of 6b, the ratio V/V max for the jet travelling in the pool was around 0.4-0.5 depending on the slope and the pool-to-slot width ratio. These values lie between the values found by Wu et al (1999) and Liu et al (2006), respectively 0.4 and 0.5-0.6. In this study particular attention was paid to low-velocity flow zones that fish, especially smaller individuals, are likely to use for resting.…”

Section: > Topologysupporting

confidence: 77%

“…Two different flow patterns FP1 and FP2 were observed, both of which had previously been identified by different authors (Wu et al, 1999;Puertas et al, 2004, Liu et al, 2006. However, these earlier studies considered only specific geometric designs (generally L/b and B/b ratios of 10 and 8) and either two or three different slopes.…”

Section: > Topologymentioning

confidence: 72%

“…Nowadays, the use of more sophisticated measurement techniques such as Particle Image Velocimetry (PIV) and Acoustic Doppler Velocimetry (ADV) allows us to measure the average and turbulent characteristics of flows more easily. Several experimental studies have been carried out recently using microacoustic velocimeters (Puertas et al, 2004;Liu et al, 2006) to measure velocities and different turbulence parameters in VSFs. A detailed experimental investigation was undertaken in the Institut PPRIME (France) in order to better characterize the flow pattern in the pools of a vertical fish pass, particularly the areas of low velocity which are considered to be resting zones for fish.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of experimental fluid mechanics to the design of vertical slot fish passes

Wang

Lee

Larinier

2010

Knowl. Managt. Aquatic Ecosyst.

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Key-words:vertical slot fish pass, flow topology, velocity field, turbulent kinetic energy This paper presents the main results of an experimental study of mean and turbulent characteristics of flow in a scale model of a vertical slot fish pass with varying width and slope (from 5% to 15%). Experimental hydraulic modelling was combined with the study of fish behaviour in the model. The discharge coefficient, which significantly affects the design of such facilities, varied from 0.67 to 0.89 and was strongly influenced by the slope. Two distinct flow patterns were observed, depending on the slope and the fish pass width. The point of transition between the two states was determined. Low velocity areas are likely resting zones for fish and particular attention was paid to evaluating these areas. Slope was found to affect both the volume of the low velocity zone, and the value of turbulent kinetic energy in these areas. The statistical characteristics of turbulent kinetic energy in the pools were linked primarily to the maximum velocity in the jet. An analysis of the behaviour of juvenile brown trout (Salmo trutta) in the scale model clearly showed that the fish avoided the areas of high velocities in the jet, except at the slot itself where they took advantage of the jet's non-stationary character. Low-velocity areas were not frequented uniformly by fish, which stayed most frequently in the zone located just downstream from the slot and behind the small side baffle. It is suggested that future studies might investigate lower pool-length to slot-width ratios, which might make it possible to increase the slope significantly and should also examine ways of improving hydraulic conditions for fish by carefully distributing obstacles in pools. RÉSUMÉContribution de la mécanique des fluides expérimentale à la conception des passes à poissons à fentes verticales

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Section: > Topologysupporting

confidence: 77%

Section: > Topologymentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Contribution of experimental fluid mechanics to the design of vertical slot fish passes

Wang

Lee

Larinier

2010

Knowl. Managt. Aquatic Ecosyst.

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“…Fishways are hydraulic structures that enable the passage of fish under all circumstances and for all the species concerned, and therefore play a vital ecological role (Violeau, 2012). They are designed to attract fish readily and allow them to enter, pass through and exit safely with no undue stress, injury and especially without any undue delay for adult spawners (Liu et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Numerical and physical model study of a vertical slot fishway

Bombač¹,

Novak

Rodic³

et al. 2014

Journal of Hydrology and Hydromechanics

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This paper presents the results of an experimental and numerical study of a vertical slot fishway (VSF). A 2-D depth-averaged shallow water numerical model PCFLOW2D coupled with three different turbulent models (constant eddy viscosity, Smagorinsky and k -ε) was used. A detailed analysis of numerical parameters needed for a correct simulation of the phenomenon was carried out. Besides the velocity field, attention was paid to important hydraulic parameters such as maximum velocity in the slot region and energy dissipation rate ε in order to evaluate the performance of VSF. A scaled physical hydraulic model was built to ensure reliable experimental data for the validation of the numerical model. Simulations of variant configurations of VSF showed that even small changes in geometry can produce more fishfriendly flow characteristics in pools. The present study indicates that the PCFLOW2D program is an appropriate tool to meet the main demands of the VSF design.

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“…Out of the many scholars probing into the water structures of pools [1,2], only a few have examined the water depths in the VSFs. Rajaratnam et al [3] conduct an experimental study on the hydraulics of VSFs, and obtain conceptual backwater profile (M1) and drawdown profile (M2) (plus an approximate uniform flow profile) under different tail water scenarios.…”

Section: Introductionmentioning

confidence: 99%

Water profiles in vertical slot fishways without central baffle

Li¹,

Sun²,

Liu³

et al. 2017

IJHT

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This paper examines the water depth variations of vertical slot fishways (VSFs) without central baffle. Three experimental models are built for the research. The results show that: the adjoining pools should have the same fore-and-aft elevation difference to prevent obvious fluctuation of water depth. Instead of being uniform along the fishway, the water depth is affected by upstream and downstream water levels. The fluctuations of the water levels exert an impact to over a dozen pools at the end of the fishway. The water line characteristics are different when the downstream water depth is greater or smaller than the normal conditions. Under the working condition of backwater, the water depth increases uniformly in pools in the backwater section; under the condition of drawdown, the depth falls faster in the pools closer to the end of the fishway. Two flow profiles are obtained from the VFS: the Ml and M2, which are analyzed by the Bakhmeteff-Chow method. These findings help enhance the understanding of the hydraulic design of the fishway, and improve efficiency of the VSFs.

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Mean Flow and Turbulence Structure in Vertical Slot Fishways

Cited by 107 publications

References 18 publications

Contribution of experimental fluid mechanics to the design of vertical slot fish passes

Contribution of experimental fluid mechanics to the design of vertical slot fish passes

Numerical and physical model study of a vertical slot fishway

Water profiles in vertical slot fishways without central baffle

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