PROPOSAL OF TETHERED ADCP PLATFORM FOR HIGH-SPEED FLOW MEASUREMNTS

Abstract

When flow regime observation is conducted with a tethered ADCP platform at a point where the water table fluctuates violently during flooding, missing data is more likely to result from the oscillation of the platform. To conduct safe and reliable observation, minimization of two aspects, the oscillation and the impact of floating debris, should be carefully considered for architecting tethered ADCP platforms. In this study, the authors conducted flow regime observation at a high-velocity point in the Tonegawa River with a total of four tethered ADCP platforms. Each platform was mounted with an ADCP, RTK-GPS and MEMS inclination sensor. Based on the knowledge of the observation, the authors proposed a suitable platform structure to conduct actual flood discharge observation for appropriate safety and measurement accuracy.