Velocity distribution measurements in a fishway like open channel by Laser Doppler Anemometry (LDA)

Experiments in an open channel flume with placing a vertical half cylinder barrier have been performed in order to investigate how the upstream velocity profiles are affected by a barrier. An experimental technique using Laser Doppler Velocimetry (LDV) was adopted to measure these velocity distribut...

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Bibliographic Details
Main Authors: Sayeed-Bin-Asad, S.M., Lundström, T. S., Andersson, A.G., Hellström, J. G. I.
Format: Conference Proceeding
Language:English
Subjects:
Barriers
Cylinders
Discharge
Laser doppler velocimeters
Open channel flow
Upstream
Velocimetry
Velocity
Velocity distribution
Velocity measurement
Viscosity
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Summary:Experiments in an open channel flume with placing a vertical half cylinder barrier have been performed in order to investigate how the upstream velocity profiles are affected by a barrier. An experimental technique using Laser Doppler Velocimetry (LDV) was adopted to measure these velocity distributions in the channel for four different discharge rates. Velocity profiles were measured very close to wall and at 25, 50 and 100 mm upstream of the cylinder wall. For comparing these profiles with well-known logarithmic velocity profiles, velocity profiles were also measured in smooth open channel flow for all same four discharge rates. The results indicate that regaining the logarithmic velocity profiles upstream of the half cylindrical barrier occurs at 100 mm upstream of the cylinder wall.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201611402005