陳興農1，李  儀2，胡天忠1，張  偉1，湯黎明1

（1. 長江水利委員會水文局漢江水文水資源勘測局， 湖北 襄陽 441000；

2. 南水北調中線干線工程建設管理局陶岔管理處，河南 南陽 474450）

　　摘  要：南水北調中線調水主干渠陶岔出水口流量監測數據是丹江口水庫水資源跨流域調度水量監測的重要依據,為提高陶岔出水口流量監測精度，陶岔主干渠安裝Quantum時差法超聲波流量實時監測系統。以Quantum時差法超聲波流量實時監測系統為例，介紹時差法超聲波流量計在大型渠道中應用的工作原理、安裝方式、流量計算方法，并與轉子式流速儀法、走航式ADCP法同步流量測驗進行比測分析。比測結果表明：Quantum時差法超聲波流量實時監測系統測得流量精度滿足GB 50179精度滿足計《河流流量測驗規范》中的相關要求，作為新型流量測驗裝備，具備自動化和信息化優勢，可實現流量遠程連續監測，提高水文監測效率，提升水文監測能力。

　　關鍵詞：時差法超聲波流量計；南水北調中線；流量監測；水量監測；渠道；比測；水文自動化

Application analysis of time difference ultrasonic flowmeter in large canal

CHEN Xingnong1, LI Yi2, HU Tianzhong1, ZHANG Wei1, TANG Liming1

(1.    Hanjiang Hydrological and Water Resources Survey Bureau, Hydrology Bureau, the Yangtze River Water Conservancy Committee , Xiangyang 441000, China;

2. Taocha Management Office of Construction Management Bureau of South-to-North Water Diversion Middle Route Project, Nanyang 474450, China)

　　Abstract: Flow monitoring data of the Taocha water outlet, which is the main diversion canal of the South-to-North Water Diversion Middle Route Project, is an important basis for water quantity monitoring of water cross-basin dispatch of Danjiangkou Reservoir water resources. In order to improve the accuracy of Taocha water outlet flow monitoring, Taocha main channel is equipped with a Quantum time difference ultrasonic flow monitoring system. Taking the Quantum time difference ultrasonic flow monitoring system as an example, this dissertation introduces working principle, installation method and flow calculation method of time difference ultrasonic flowmeter applied in large channels, compares and analyzes the synchronous flow measurement between rotor current meter method and vessel-mounted ADCP. The comparison results show that: flow accuracy measured by Quantum time difference ultrasonic real-time flow monitoring system meets the relevant requirements of GB 50179-2015 “River Flow Measurement Specification”. As a new type of flow measurement equipment, it has the advantages of automatization and informatization, which can realize remote continuous flow monitoring, improve the efficiency of hydrological monitoring and enhance the ability of hydrological monitoring.

　　Key words: time difference ultrasonic flowmeter, the South-to-North Water Diversion Middle Route Project, flow monitoring, water quantity monitoring, channel, comparing flow measurement, hydrological automatizatio