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発表 Estimation of actual uncertainty of ADCP measurement in a river

作成年度 2019 年度
論文名 Estimation of actual uncertainty of ADCP measurement in a river
論文名(和訳)
論文副題
発表会 Teledyne Marine Technology Workshop 2019
誌名
巻・号・回  
発表年月日 2019/10/06 ~ 2019/10/09
所属研究室/機関名 著者名(英名)
PWRIAtsuhiro yorozuya
抄録
Estimation of uncertainties is one of mandatory work for hydrological observation. Total uncertainties are composed with uncertainties of each single measurement. For example, velocity, depth, and width are one of them. In the case of Acoustic Doppler Current Profiler, many measurements involve; e.g., inclination, direction by the magnetic sensor, velocity and others. Though determination of uncertainty is not easy, several methods have developed, e.g., QUANT by Moore et al. (2017), Q-View by Hening (2017), QRev by Muller (2016), and RiverFlowUA by Gonzalez-Castro et al. (2016). Though the methodologies are available to users, still the subject of curiosity is what is the actual uncertainty of ADCP measurements. In the case of the Monte Carlo simulation, 1000 times numerical trials should be conducted in order to satisfy the Gaussian distribution. Similarly, 1000 times measurements may be necessary to conduct measurements in order to obtain actual uncertainties.In order to satisfy the curiosity, the authors conducted the ADCP measurement with relatively steady flow condition in actual rivers. The Work Horse ADCP with 1200 kHz was mounted on the high-speed river boat. The high-speed river boat was tethered by a manned control boat. Horizontal-ADCP was also used for monitoring the steady flow condition. 209 transects were obtained in an observational period, which is a day. During the measurements, water depth changed about 10 to 15 cm, while discharge changed between 200 m3/s to 300 m3/s. As a result, 5.8% of uncertainty was estimated with the bottom track reference, while 7.5% with GNSS reference.
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