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- W2938486177 abstract "This paper addresses the importance of the alignment of an acoustic Doppler current profiler (ADCP) with a global positioning system (GPS) in moving-boat streamflow measurements. It presents a mathematical analysis of the discharge bias induced by a misalignment angle. A small misalignment angle may cause a significant bias in a transect discharge. The bias consists of non-directional and direction components. The directional bias is proportional to the ratio between boat velocity and water velocity. In a normal condition of ADCP streamflow measurements, however, the directional bias in transect discharges can be approximately cancelled in the average discharge of reciprocal transects, even if heading-dependent errors are involved in the misalignment. This paper also presents a trial-and-error method for estimating the misalignment angle. We analyzed the transect discharge data obtained from a field measurement on the Yangtze River at the Huangling Temple hydrology station located about 5 km downstream from the Three Gorges Dam to gain insights on the effect of misalignment. Results of this case study suggest that the data for transect discharges must be processed to remove directional bias prior to the Type A evaluation of the random uncertainty of the measured discharge. Otherwise, the estimated Type A uncertainty would be false and misleading." @default.
- W2938486177 created "2019-04-25" @default.
- W2938486177 creator A5020815166 @default.
- W2938486177 date "2019-06-01" @default.
- W2938486177 modified "2023-09-24" @default.
- W2938486177 title "The importance of ADCP alignment with GPS in moving-boat streamflow measurements" @default.
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- W2938486177 doi "https://doi.org/10.1016/j.flowmeasinst.2019.04.002" @default.
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