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Quantifying uncertainty in discharge measurements: A new approach

January 1, 2009

The accuracy of discharge measurements using velocity meters and the velocity-area method is typically assessed based on empirical studies that may not correspond to conditions encountered in practice. In this paper, a statistical approach for assessing uncertainty based on interpolated variance estimation (IVE) is introduced. The IVE method quantifies all sources of random uncertainty in the measured data. This paper presents results employing data from sites where substantial over-sampling allowed for the comparison of IVE-estimated uncertainty and observed variability among repeated measurements. These results suggest that the IVE approach can provide approximate estimates of measurement uncertainty. The use of IVE to estimate the uncertainty of a discharge measurement would provide the hydrographer an immediate determination of uncertainty and help determine whether there is a need for additional sampling in problematic river cross sections. ?? 2009 ASCE.

Publication Year 2009
Title Quantifying uncertainty in discharge measurements: A new approach
DOI 10.1061/41036(342)599
Authors J.E. Kiang, T.A. Cohn, R.R. Mason
Publication Type Conference Paper
Publication Subtype Conference Paper
Index ID 70037221
Record Source USGS Publications Warehouse