Physical modelling of pool and weir fishways with rock weirs

The flow characteristics of pool and weir fishways with rock weirs were studied through physical modelling. Detailed flow measurements were obtained using an acoustic Doppler velocimeter to understand how weir geometry, discharge, and bed slope affect flow patterns, velocity, turbulence kinetic ener...

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Bibliographic Details
Published in:River research and applications 2017-09, Vol.33 (7), p.1130-1142
Main Authors: Kupferschmidt, C., Zhu, D. Z.
Format: Article
Language:English
Subjects:
Acoustic measurement
ADV
Computational fluid dynamics
Discharge
Discharge coefficient
Doppler sonar
Fish
Fish migration
fishway
Fishways
Flow characteristics
Kinetic energy
Mathematical models
Modelling
nature‐like fishway
Orifice flow
pool and weir fishway
Pools
Restoration
River restoration
Rivers
rock weir
Rocks
Turbulence
Turbulence intensity
Turbulent flow
Velocity
Weirs
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Summary:The flow characteristics of pool and weir fishways with rock weirs were studied through physical modelling. Detailed flow measurements were obtained using an acoustic Doppler velocimeter to understand how weir geometry, discharge, and bed slope affect flow patterns, velocity, turbulence kinetic energy, turbulence intensity, and Reynolds shear stresses in the fishway. The weir geometries used in this study are similar to those typically used for river restoration projects. The use of a V‐shaped rock weir was found to reduce the mean streamwise velocity in the pools by about 20% but more than double the maximum velocity magnitude. Two stage–discharge relationships were developed using the standard weir equation and a modified discharge coefficient to account for both flow over the weir and orifice flow through the base of the weir. The use of V‐shaped rock weirs has the potential to offer significant advantages in assisting multispecies fish migration. The results of this study can be applied to the hydrotechnical design of pool and weir fishways with rock weirs and for river restoration projects.
ISSN:1535-1459
1535-1467
DOI:10.1002/rra.3157