利用雷达测流仪自动测量明渠流量试验研究

• Published in: Guanʻgai paishui xuebao Vol. 44; no. 2; pp. 55 - 62
• Main Authors: LI Yincai, LI, Bin, LI, Wei, YIN Wenbin, HAN, Wei, WU, Xiaolei
• Format: Journal Article
• Language: Chinese
• Published: Xinxiang City Chinese Academy of Agricultural Sciences (CAAS) Farmland Irrigation Research Institute Editorial Office of Journal of Irrigation and Drainage 01.01.2025; 宁夏回族自治区渠首管理处,宁夏 青铜峡 751600%宁夏晟和科技有限公司,银川 750001%宁夏回族自治区惠农渠管理处,银川 750001%西安鹰格电子科技有限公司,西安 710075
• Subjects: Average flow; Concrete slabs; Electromagnetic radiation; Flow measurement; Flow rates; Flow velocity; Flowmeters; Irrigation; Irrigation districts; Irrigation systems; Irrigation water; Mathematical models; Open channel flow; Open channels; Precast concrete; Radar; Reinforced concrete; Resource allocation; Surface velocity; Truss bridges; Velocimetry; Velocity measurement; Water conservation; Water flow; Water resources; Water velocity; 精度分析; 雷达测速; automatic flow measurement; 流速系数; 自动测流; accuracy analysis; velocity coefficient; 畅流明渠; radar speed measurement; smooth flow open channels
• ISSN: 1672-3317
• DOI: 10.13522/j.cnki.ggps.2023485

【目的】利用非接触式雷达测流仪自动测量明渠断面过水流量，为实现合理调配水资源和节水灌溉智能化精准计量提供依据。【方法】采用流速面积法。选择宁夏惠农渠某引水系渠道顺直水流稳定的断面，将雷达测速仪设备安装在刚性桁架桥中心距渠底2.1 m和4.7 m处，利用雷达测速仪自动测得断面表面流速和中泓线水深，应用本研究建立的数模公式，计算出其断面面积及流量，与在其断面上游600 m出水管道安装的电磁流量计实测流量对比，进行流量误差分析。【结果】用雷达测流仪及其所构建数学模型计算得出的明渠流量，经与电磁流量计实测流量比测结果表明，其η取值0.014~0.026均可满足量水精度的要求。雷达测速仪安装高度为2.1 m和4.7 m处时，系统误差分别为0.89%和-0.79%，随机不确定度分别为2.22%和2.88%。若全断面预制混凝土板砌护η取值0.020测算结果更为精确。综合比测流量精度达95%以上。【结论】应用雷达测速技术能满足灌区明渠施测流量的精度要求。通过构建数学模型计算得出平均流速，无须人工测验率定流速系数，实现自动准确测流之目的。可供较大断面明渠精准测流应用。