人民长江 ›› 2022, Vol. 53 ›› Issue (4): 86-90.doi: 10.16232/j.cnki.1001-4179.2022.04.014

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南水北调工程陶岔站时差法流量计推流技术研究

邓山;赵昕;张莉;吴琼;左建   

  • 发布日期:2022-05-24

Research on discharge calculation by ultrasonic transit time method flowmeter at Taocha Hydrological Station, canal head of South-to-North Water Diversion Project

DENG Shan1,2, ZHAO Xin1, ZHANG Li1, WU Qiong1, ZUO Jian2   

  • Published:2022-05-24

摘要: 陶岔水文站为南水北调中线工程源头陶岔渠首水量计量断面,为提高陶岔站超声波时差法流量计的流量测验精度,对时差法流量计算原理及推流方法进行了研究,提出了基于多元回归的多声路时差法断面平均流速计算方法,并以实测流量为率定样本,验证了该方法的适用性。同时,基于走航式ADCP测验资料,分析了陶岔站垂线流速分布规律及最优幂指数,以及幂指数对ADCP流量测验精度的影响。结果表明:基于多元回归的多声路时差法断面平均流速计算方法能进一步提高陶岔站流量监测的精度;陶岔站垂线流速分布符合幂函数分布,最优幂指数为0.120 8,在用走航式ADCP进行流量测验时,建议采用该系数,可减小单次流量测验误差1%~2%。研究成果可为流量在线监测推流方法的选择及推流精度的提高提供参考。

关键词: 流量在线监测;超声波时差法;流速分布;多元回归;陶岔水文站;南水北调工程;

Abstract: Taocha Hydrological Station is the flow measurement section of Taocha canal head, which is the source of Middle Route of South-to-North Water Diversion Project. In order to improve the accuracy of ultrasonic transit time method flowmeter, this paper studied the principle and method of discharge calculation, and put forward the average velocity calculation method of multi-layer transit time method based on multiple regression. The applicability of the method was verified by using the measured discharge as a calibration sample. At the same time, based on the ADCP measurement data, optimal power index of vertical velocity distribution at Taocha Station and its influence on the accuracy of ADCP discharge measurement were analyzed. The results show that the average velocity calculation method of multi-layer transit time method based on multiple regression can improve the accuracy of discharge monitoring at Taocha Station. The vertical velocity distribution at Taocha Station conforms to power function distribution, and the optimal index is 0.1208. It is recommended to use this coefficient when using the navigation ADCP for discharge measurement, which can reduce the error of a single discharge measurement by 1% to 2%. The research results can provide reference for the selection of discharge calculation methods for online discharge monitoring and the improvement of discharge calculation accuracy.

Key words: discharge online monitoring; ultrasonic transit time method; velocity distribution; multiple regression; Taocha Hydrological Station; South-to-North Water Diversion Project