大型明渠测流的电磁感应法

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。

Electromagnetic Induction Method for Flow Survey in Big Open Channel

Flow survey at the water diversion gates along the Yellow River is always of the characteristics of high sediment concentration, easy sedimentation on river bed, high content of floating drift, tremendous variation of flow discharge, irregular river paths, and so on. Discharge survey through electromagnetic induction principle is of non comparable advantages among many others. The characteristics of principle, method and practice of discharge survey through broad coil electromagnetic induction method in open full channel are introduced in the paper, and it is compared with supersonic flow survey method in principle and practice.