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| DOI：10.13522/j.cnki.ggps.2021421 |
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| Calculating Water Flow Rate with Measurement Errors of the Weir Considered |
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JIAO Xuan, ZHAO Lanhao, WANG Zhengzhong, QIU Yong
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1. College of Water Resources and Hydropower, Hohai University, Nanjing 210024, China;
2. Cold and Arid Regions Water Engineering Safety Research Center, Key Laboratory Agricultural Soil and
Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Xi’an 721000, China;
3. Sate Key Laboratory of Frozen Soil Engineering, CAS, Lanzhou 730000, China;
4. College of Water Resources and Hydropower, Yunnan Agricultural University, Kunming 650201, China
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| Abstract: |
| 【Objective】 Weir is a classical apparatus measuring water flow rate in open channels. Its accuracy and the formula used to calculate flow rate depend on many factors. In this paper, we proposed a new method to calculate flow rate with measurement errors of the Weir taken into account. 【Method】Considering the limitation of short series in multiple regression for calibrating the basic weir flow using the simplified lumped flow coefficient, the statistical effect of the accuracy of weir-measured flow in short series causal mapping relationship is found from the calibration results of different measured weir flow accuracy under the experimental statistical characteristics. The consistent response mechanism under the effect of multi-dimensional variable weir flow characteristic variable fuzzy probability correlation distribution identification and measured weir flow accuracy is established. 【Result】The multivariate short series discharge calculation involving the front and rear weir width ratio a/c, the side weir length b and the expansion ratio L/W is a multidimensional variable fuzzy probability correlation distribution response different from the traditional linear section causal mapping model; From the perspective of algorithm mechanism, it is revealed that under the same weir crest head H, the contribution of front and rear weir width ratio a/c, side weir length b and widening ratio L/W to the characterization of the index measured discharge [Q'cr] is of equal significance.【Conclusion】The application calibration and verification of different short series measured weir flow accuracy samples in the existing literature results show that the calculation results of the method are in good agreement with the experimental statistical results, and the research results can provide reference for the design review of similar projects. |
| Key words: right angle weir type; test statistics; basic weir flow model; measured weir flow accuracy; discharge |
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