| 引用本文: | 薛绍鹏,葛茂生,魏福强,等.基于偏差分布的喷灌均匀性评价指标构建与应用[J].灌溉排水学报,2023,42(12):92-98. |
| XUE Shaopeng,GE Maosheng,WEI Fuqiang,et al.基于偏差分布的喷灌均匀性评价指标构建与应用[J].灌溉排水学报,2023,42(12):92-98. |
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| 摘要: |
| 【目的】建立综合评价水量分布整体和局部特性的均匀度系数，为喷灌系统优化设计与运行参数的合理配置提供参考。【方法】通过定义正负偏差与偏差分布的概念，提出一种基于偏差分布的均匀系数DUl和DUh。选取Nelson D3000喷头作为研究对象，实测和计算其水量分布，对比了均匀系数DUl、DUh、CU、DU对水量分布的评价性能，对发生亏缺灌溉或过量灌溉的敏感度，不同组合间距和工作压力下的均匀性。【结果】①组合间距为1.5R时，发生过量灌溉，仅DUh表现出较差均匀度，此时正偏差集中分布在小区域内。②发生小区域过量灌溉时，CU和DUh具有较高敏感度，分别为11.15%和9.32%；发生小区域亏缺灌溉时，DUl和DUh敏感度分别为4.69%和5.70%。③组合间距对DUh、DUl、CU、DU有显著影响；随着工作压力的增大，DUl和DUh差异显著，CU、DU差异不显著。④参考CU水平分类标准，构建了均匀系数DUl、DUh随正负偏差分布动态变化的评价指标划分标准，假设正负偏差分布相等，DUl和DUh的及格标准分别为70%和130%。【结论】基于偏差分布构建的均匀系数DUl、DUh对于准确评价水量分布均匀性和优化喷灌机配置较CU、DU更为优越。 |
| 关键词: 喷灌；均匀系数；偏差分布；分布均匀；敏感度分析；显著性检验 |
| DOI：10.13522/j.cnki.ggps.2023140 |
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| Modeling and Application of Rotary Refractive Sprinkler Head Mobile Spray Water Distribution Calculation Model |
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XUE Shaopeng, GE Maosheng, WEI Fuqiang, ZHANG Qianwen
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1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China;
2. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education,
Northwest A&F University, Yangling 712100, China
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| Abstract: |
| 【Objective】Uniformity coefficient is an important parameter in design and operation of sprinkler irrigation. Based on CU and DU, this paper proposed a methods to evaluate whole and local water distribution to help improve design of sprinkler systems and the rational configuration of operating parameters.【Method】We propose a uniformity coefficient DUl and DUh based on by defying positive and negative skewed distribution. Water distribution of the Nelson D3000 nozzle was measured and calculated, and the ability of DUl, DUh, CU and DU for evaluating water distribution, sensitivity to deficient or excessive irrigation, and uniformity under different nozzle-spacing and working pressure were compared and evaluated.【Result】When the irrigation occurs at 1.5R combined spacing, only DUh shows poor uniformity, where the positive deviation is concentrated in a small region. The sensitivity of CU and DUh was 11.15% and 9.32%, respectively. DUl and DUh were more sensitive to small area deficit irrigation, with sensitivity being 4.69% and 5.70%, respectively. The combined distance has significant influence on DUl, DUh, CU and DU. With the increase in working pressure, DUl and DUh showed significant differences, and the differences were more significant than CU and DU, with the F value being 0.123 and 0.399. DUl, DUh are more accurate. Based on CU level classification standard, the division standard of horizontal classification evaluation index with the dynamic change of uniformity coefficient DUl and DUh with positive and negative deviation distribution is constructed. Assuming an equal distribution of positive and negative deviations, the pass criteria for DUl and DUh are 70% and 130%, respectively. 【Conclusion】DUl and DUh based on deviation distribution are superior to CU and DU for accurately evaluating water distribution uniformity and optimizing sprinkler configuration. |
| Key words: sprinkler irrigation; uniformity coefficient; deviation distribution; uniformity of distribution; sensitivity analysis; significance test |
