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黄河流域的众多引水口测流，具有含泥沙量大、易沉淀淤积河床、漂浮物多、水量变化范围大、水路形状不规则等特点。在众多测流方法中，电磁感应原理的流量测量方法有着其他测流方法不可比拟的优越性。主要介绍了明渠全渠宽线圈的电磁感应法流量测量的原理、方法、应用特点，并从原理和实际应用等方面，与超声波测流法作了比较。
There are many diversion ports in the Yellow River, which are characterized by large sediment concentration, easily sedimentation silting riverbed, many floating objects, large water variation range and irregular waterway shape. Among the many flow measurement methods, the flow measurement method of the electromagnetic induction principle has the incomparable superiority of other flow measurement methods. This paper mainly introduces the principle, method and application characteristics of the electromagnetic flux method for measuring the width of the open channel wide open coiled coils, and compares it with the ultrasonic measuring method from the aspects of principle and practical application.