PROBLEM TO BE SOLVED: To provide a buoy-type tidal flow measurement device and a tidal flow measurement method capable of measuring the flow rate even in a remote area with a simple structure.;SOLUTION: A buoy-type tidal flow measurement device 3 includes: a buoy 4 floated on a water surface 1; attitude keeping means for keeping the buoy 4 in a predetermined reference attitude; a fluid receiving body 5 disposed underwater; a tidal flow transmission member 6 for connecting the buoy 4 to the fluid receiving body 5; angle measuring means for measuring the angle value with respect to a reference attitude of the buoy; and calculating means 18 for calculating the flow rate of the tidal flow on the basis of the angle value with respect to the reference attitude of the buoy 4. By an inclination of the buoy 4 from the reference attitude to the tidal flow direction in conjunction with the tidal flow received by the fluid receiving body 5, the flow rate can be determined on the basis of the angle value.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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