Uncertainty Estimation and Analysis of ADCP Moving-Boat Discharge Measurements Using QRev; [QRev 를 이용한 ADCP 이동측정법 유량측정 성과의 불확도 산정 및 분석]

초록

The Acoustic Doppler Current Profiler (ADCP) enables rapid and efficient discharge measurements, but the separation and quantification of diverse error sources remain challenging, limiting the accurate estimation of uncertainty. To address this, various studies have been conducted, and the U.S. Geological Survey (USGS) developed the QRev software to estimate the uncertainty of ADCP discharge measurements. In this study, 12,852 ADCP moving-boat discharge measurements collected over the past three years from 407 gauging stations across Korea were analyzed using QRev to evaluate its applicability and to investigate uncertainty characteristics. The average uncertainty was assessed as ±9.85%, corresponding to a P grade according to the USGS classification. Component-wise analysis revealed strong correlations between increased uncertainty and both the coefficient of variation of discharge and mean velocity. Site-specific analysis showed that stations influenced by tidal effects, ephemeral streams, and dam or weir regulation exhibited higher uncertainty. The findings confirm the applicability of QRev for uncertainty assessment and highlight the need to establish uncertainty-based grading criteria tailored to the characteristics of hydrological surveys in Korea. © 2025, Korean Wetlands Society. All rights reserved.

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