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Error Analysis for Electromagnetic Surface Velocity and Discharge Measurement in Rapid Mountain Stream Flow
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 Title & Authors
Error Analysis for Electromagnetic Surface Velocity and Discharge Measurement in Rapid Mountain Stream Flow
Kim, Dong-Su; Yang, Sung-Kee; Jung, Woo-Yul;
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Fixed Electromagnetic Wave Surface Velocimetry (Fixed EWSV) has been started to be used to measure flood discharge in the mountain stream, since it has various advantages such that it works well to continuously measure stream discharge even in the night time as well as very strong weather. On the contrary, the Fixed EWSV only measures single point surface velocity, thus it does not consider varying feature of the transverse velocity profile in the given stream cross-section. In addition, a conventional value of 0.85 was generally used as the ratio for converting the measured surface velocity into the depth-averaged velocity. These aspects could bring in error for accurately measuring the stream discharge. The capacity of the EWSV for capturing rapid flow velocity was also not properly validated. This study aims at conducting error analysis of using the EWSV by: 1) measuring transverse velocity at multiple points along the cross-section to assess an error driven by the single point measurement; 2) figuring out ratio between surface velocity and the depth-averaged velocity based on the concurrent ADCP measurements; 3) validating the capacity of the EWSV for capturing rapid flow velocity. As results, the velocity measured near the center by the fixed EWSV overestimated about 15% of the cross-sectional mean velocity. The converting ratio from the surface velocity to the depth-averaged velocity was 0.8 rather than 0.85 of a conventional ratio. Finally, the EWSV revealed unstable velocity output when the flow velocity was higher than 2 m/s.
Electromagnetic wave surface velocimetry;Mountain stream;Flood discharge;ADCP;MSIV;
 Cited by
지표유속법 기반 제주 산지형 하천 Kalesto 유량 정확도 향상 기법,김동수;양성기;김수정;이준호;

Journal of Environmental Science International, 2015. vol.24. 4, pp.371-381 crossref(new window)
통계적 기법을 적용한 외도천의 단위유량도 제안,이준호;양성기;정우열;

Journal of Environmental Science International, 2015. vol.24. 4, pp.393-401 crossref(new window)
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