| 引用本文: | 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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| 摘要: |
| 【目的】利用大型渠道实测数据，评估不同弧形闸门过流公式的适用性和性能。【方法】以南水北调中线干渠严陵河闸为对象，收集约18000组监测数据，分析不同工况下的闸孔出流特性，测试国内外常用的7种公式。【结果】闸下弗氏数的变化区间为0.476~3.084，超出了南科院经验公式的适用范围；闸孔出流临界e/Hu接近0.991，超出了武水经验公式的适用范围。CAP公式、无量纲公式和3种二次型经验系数公式率定曲线的R2分别为0.989、0.996、0.809、0.822和0.832，MAE分别为2.25%、2.65%、4.11%、4.08%和3.98%。各公式在低、中潜流比下（Xr≤0.9）绝对误差均在10%以内，在高潜流比时（Xr>0.9）达18%（CAP公式）、25%（无量纲公式）和35%（3种二次型经验系数公式）。【结论】所测大型弧形闸门的工作区间明显超出了南科院和武水经验公式的适用范围，其他5种公式在低、中潜流比下（Xr≤0.9）绝对误差均在10%以内，在高潜流比下明显增大，CAP公式和无量纲公式总体表现最优。 |
| 关键词: 水力学；南水北调中线工程；弧形闸门；淹没出流 |
| DOI： |
| 分类号:TV132 |
| 基金项目:国家重点研发计划(2017YFC0405003)；国家自然科学基金(51579251) |
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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 |
