Method for measuring a horizontal mean flow velocity of a river

摘要

A method of measuring a horizontal mean flow velocity at a plurality of depths using an ultrasound beam to obtain the flow rate of a flow comprises the steps of: sending continuous ultrasound beams along a selected free cross section to measure the flow rate from an edge of a flow and measuring a moving distance of paired ultrasonic transducers ((3¶1¶) ¶i¶, (3¶2¶) ¶i¶), which are at a distance (L) from each other, until the output voltages of the paired ultrasonic transducers (( 3¶1¶) ¶i¶, (3¶2¶) ¶i¶) become equal to each other, and then measure a horizontal mean flow velocity, with the paired ultrasonic transducers ((3¶1¶) ¶i¶, (3 ¶2¶) ¶i¶) are electrically connected to differential amplifiers (4) in order to measure the position at a moment when their output voltage differences become zero, and the further steps de s testing and correcting a device for carrying out the method.