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Article

Study of a Rock-Ramp Fish Pass with Staggered Emergent Square Obstacles

by
Flavia Cavalcanti Miranda
1,
Ludovic Cassan
1,*,
Pascale Laurens
1 and
Tien Dung Tran
2
1
Fluid Mechanics Department Laboratory, Institut de Mécanique des Fluides, Allée du Professeur Camille Soula, 31400 Toulouse, France
2
Faculty of Water Resources Engineering, Hanoi Campus (Headquarters), Thuyloi University, No. 175 Tay Son, Dong Da, Hanoi 116705, Vietnam
*
Author to whom correspondence should be addressed.
Water 2021, 13(9), 1175; https://doi.org/10.3390/w13091175
Submission received: 16 March 2021 / Revised: 13 April 2021 / Accepted: 17 April 2021 / Published: 24 April 2021
(This article belongs to the Special Issue Fish Passage at Hydropower Dams)

Abstract

A rock-ramp fish passage with square obstacles was experimentally and numerically studied in this work with the objective of investigating in detail the hydraulic behind such fishways and to evaluate the importance of the shape of the obstacles. The LES and VOF methods were used for the simulations, and for the measurements, shadowgraphy and ADV were applied. Two different validations were successfully performed. In the first one, the experimental and numerical results of a chosen case were compared in detail. In the second validation, the focus was given to the stage-discharge. Following the validation, a numerical study was carried out to point out the differences in the flow characteristics from a configuration with square and circular obstacles. The discharge was nearly the same for both configurations, which implies different water depths. The results showed a lower velocity field, lower turbulent kinetic energy, and lower lateral fluctuations for the configuration with square blocks, which indicated a better passability for this geometry. However, it also presented a higher water depth, which led to a less attractive discharge. The differences in the flow generated in the two configurations indicated that the shape is an important modifiable parameter to be considered in the design process.
Keywords: rock-ramp fish passage; large eddy simulation; staggered emergent square obstacles; stage-discharge analysis; experimental validation rock-ramp fish passage; large eddy simulation; staggered emergent square obstacles; stage-discharge analysis; experimental validation

Share and Cite

MDPI and ACS Style

Miranda, F.C.; Cassan, L.; Laurens, P.; Tran, T.D. Study of a Rock-Ramp Fish Pass with Staggered Emergent Square Obstacles. Water 2021, 13, 1175. https://doi.org/10.3390/w13091175

AMA Style

Miranda FC, Cassan L, Laurens P, Tran TD. Study of a Rock-Ramp Fish Pass with Staggered Emergent Square Obstacles. Water. 2021; 13(9):1175. https://doi.org/10.3390/w13091175

Chicago/Turabian Style

Miranda, Flavia Cavalcanti, Ludovic Cassan, Pascale Laurens, and Tien Dung Tran. 2021. "Study of a Rock-Ramp Fish Pass with Staggered Emergent Square Obstacles" Water 13, no. 9: 1175. https://doi.org/10.3390/w13091175

APA Style

Miranda, F. C., Cassan, L., Laurens, P., & Tran, T. D. (2021). Study of a Rock-Ramp Fish Pass with Staggered Emergent Square Obstacles. Water, 13(9), 1175. https://doi.org/10.3390/w13091175

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