| 摘要 |
PROBLEM TO BE SOLVED: To provide a river current velocity measuring instrument which is complied with changes of water quality. SOLUTION: When a command signal S50a is outputted from a detection arithmetic part 50, a receive signal S62a is detected by the detection arithmetic part 50 through a transmitter/receivers 61, a wave transmitter/receiver 71, a transmitter/receiver 65, a wave transmitter/receiver 75, a wave transmitter/ receiver 72, and a transmitter/receiver 62 in order. In the reverse direction, a receive signal S61b is detected by the detection arithmetic part 50 similarly to calculate a current velocity V1. A signal transmitting and receiving means consisting of the transmitter/receivers 63, 64, and 65 and the wave transmitter/ receivers 73, 74, and 75 calculates a current velocity V2 by the detection arithmetic part 50 as well as the current velocity V1 and a display unit 51 displays it. The mean current velocity Vav of the overall river width is obtained by finding the mean value of the current velocities V1 and V2.
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