Author(s): Shoji Okada; Atsuhiro Yorozuya; Takashi Kitsuda
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Keywords: No Keywords
Abstract: To have a better understanding of ADCP instruments and develop a system for the highly accurate measurement related to water discharge, velocity profiles and bathymetries, authors focus attention on a build-in inclination sensor in ADCP, which is a traditional liquid-surface-detection type. The field measurement with a floating vessel in Japan involves high velocity and vibration of water surface, which might induce the major sources of error related to a vessel fluctuation. Therefore, in this paper, authors quantitatively evaluate the influence of vessel fluctuation on ADCP measurement with 1) developing a measurement system with employing an MEMS inclination sensor, 2) conducting experiments in an experimental pool with the system, and 3) conducting the field measurement. The authors find out characteristics of the build-in inclination sensor of ADCP, apply the knowledge to actual discharge measurements, evaluate the systematical measurement error, and introduce the possible solution for eliminating missing values.
Year: 2009