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Physical modelling of pool and weir fishways with rock weirs
Author(s) -
Kupferschmidt C.,
Zhu D. Z.
Publication year - 2017
Publication title -
river research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.679
H-Index - 94
eISSN - 1535-1467
pISSN - 1535-1459
DOI - 10.1002/rra.3157
Subject(s) - weir , discharge coefficient , turbulence , turbulence kinetic energy , geology , geotechnical engineering , flow (mathematics) , hydrology (agriculture) , acoustic doppler velocimetry , flow velocity , reynolds stress , stage (stratigraphy) , environmental science , mechanics , engineering , geography , blood flow , cartography , laser doppler velocimetry , paleontology , mechanical engineering , medicine , physics , nozzle
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.