期刊
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
卷 64, 期 3, 页码 255-275出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2019.1577555
关键词
stage uncertainty; discharge uncertainty; stage-discharge curve; rating curve; rating curve uncertainty
资金
- Australian Research Council Future Fellowship [FT120100130]
The purpose of this paper is to determine uncertainty in the gauged range of the stage-gauged discharge relationship for 622 rating curves from 171 Australian Bureau of Meteorology Hydrologic Reference streamgauging Stations (HRS). Water agencies use many methods to establish rating curves. Here we adopt a consistent method across all stations and develop rating curves based on Chebyshev polynomials, and estimate uncertainties from standard regression errors in which residuals from the polynomials are adjusted to ensure they are homoscedastic and normally distributed. Uncertainty in input water level is also taken into account. The median uncertainties in mean response of the available gauged discharge relationship at median daily discharges for the HRS dataset range from +4.5 to -4.2% (95% confidence band) and for individual gaugings from +29 to -22% incorporating a water level uncertainty of +/- 4 mm. The uncertainties estimated are consistent with values estimated in Australia and elsewhere.
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