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| Uncertainty Evaluation of Open channel Discharges Measurement with the Velocity area Method |
| ZHAO Wei-guo1,WANG Cheng-li1,ZHU Wei2,DAI Liang-chao1 |
1. China Jiliang University, Hangzhou, Zhejiang 310018, China;
2. Hangzhou Institute of Calibration and Testing for Quality and Technical Supervision, Hangzhou, Zhejiang 310019, China |
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Abstract According to the ISO 748, when the uncertainty of open channel discharge measurement was evaluated, the sufficient measurements and verticals need be set in the crosssection, but velocity interpolation to the edge and in the top/bottom layers are not taken into account. In order to solve the problems, a new approach is introduced for evaluating the uncertainty. The vertical velocity and transversal mean velocity distribution model of crosssection were achieved with FLUENT. In the experiment, the uncertainty caused by limited number of velocity measurements points and measurement verticals were computed with the velocity distribution models respectively. The uncertainty components are analyzed to calculate the uncertainty of discharge measurements. The experiment results showed that the method improves the accuracy of the measurement uncertainty.
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2015, Vol. 36 
