| Cite this article: | 崔巍,吴鑫,陈文学,等.大型渠道弧形闸门过流公式测试比较[J].灌溉排水学报,0,():-. |
| cui wei,wu xin,chen wenxue,et al.大型渠道弧形闸门过流公式测试比较[J].灌溉排水学报,0,():-. |
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| Comparison of Discharge Equations for Radial Gate in Large Scale Canal |
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cui wei1, wu xin2, chen wenxue1, mu xiangpeng1
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1.China Institute of Water Resources and Hydropower Research;2.Wuhan University
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| Abstract: |
| 【Objective】The purpose is to examine the applicability and performance of various radial gate flow equations using field data in large scale canal.【Method】Taking Yanlinghe gate of the middle route of South-to-North Water Diversion Project as the object of study, collecting about 18,000 sets of monitoring data, characteristics of submerged orifice flow were analyzed and 7 domestic and international equations were tested.【Result】Froude numbers under gate were between 0.476~3.084, which exceeded the applicable scope of the NHRI empirical equation. The critical e/Hu of orifice flow was near 0.991, which exceeded the applicable scope of WHU empirical equation. The R2 for CAP equation, dimensionless equation, and 3 quadratic empirical equations were 0.989, 0.996, 0.809, 0.822 and 0.832. Corresponding MAE were 2.25%, 2.65%, 4.11%, 4.08% and 3.98%. Errors of all equations were within 10% under low and medium Xr (Xr≤0.9) flow conditions. When Xr was over 0.9, MAE increased significantly, which was 18% (CAP equation), 25% (dimensionless equation) and 35% (3 quadratic empirical equations).【Conclusion】Working conditions examined were beyond the applicable scope of the NHRI empirical equation and WHUEE empirical equation. Errors for Xr≤0.9 were within 10% for all other 5 equations. They increased obviously when Xr was over 0.9. Overall, CAP equation and dimensionless equation showed the best performance. |
| Key words: hydraulics; the middle route of South-to-North Water Diversion Project; radial gate; submerged orifice flow |
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