Unsteady discharge calibration of a large V-notch weir

Chanson, Hubert and Wang, Hang (2013) Unsteady discharge calibration of a large V-notch weir. Flow Measurement and Instrumentation, 29 19-24. doi:10.1016/j.flowmeasinst.2012.10.010

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Author Chanson, Hubert
Wang, Hang
Title Unsteady discharge calibration of a large V-notch weir
Journal name Flow Measurement and Instrumentation   Check publisher's open access policy
ISSN 0955-5986
1873-6998
Publication date 2013-03
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.flowmeasinst.2012.10.010
Open Access Status File (Author Post-print)
Volume 29
Start page 19
End page 24
Total pages 6
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2013
Language eng
Formatted abstract
Thin-plate weirs are commonly used as measuring devices in flumes and channels, enabling an accurate discharge measurement with simple instruments. The calibration formulae of such devices rely upon some empirical coefficients and there is a need to obtain new accurate physical data to complement the existing evidence. In the present study, the discharge calibration of a large 90° V-notch thin plate weir was performed using an unsteady volume per time technique. The V-notch weir was initially closed by a fast-opening gate. The sudden opening induced an initial phase of the water motion dominated by the free-falling motion of a volume of fluid in the vicinity of the weir, followed by a gradually-varied phase, during which some seiche was observed in the tank. The relationship between water discharge and upstream water elevation was derived from the integral form of the continuity equation. The results yielded a dimensionless discharge coefficient Cd=0.58 close to previous experiments for 90° V-notch weirs. The findings showed that the unsteady discharge calibration of the V-notch weir yielded similar results to a more traditional calibration approach based upon steady flow experiments, allowing a rapid testing over a broad range of flow rates.
Keyword 90° V-notch weir
Unsteady experiments
Calibration
Discharge measurement
Seiche
Sloshing
Dam break wave
Physical modelling
Triangular V-notch thin-plate weir
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 29 October 2012; Post-print deposited in line with Sherpa Romeo policy: author can archive post-print (ie final draft post-refereeing)

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Created: Thu, 29 Nov 2012, 07:37:05 EST by Hubert Chanson on behalf of School of Civil Engineering