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Simple vs complex rating curves: accounting for measurement uncertainty, slope ratio and sample size
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.ORCID iD: 0000-0002-4625-2495
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.ORCID iD: 0000-0002-8180-4996
2017 (English)In: Hydrological Sciences Journal, ISSN 0262-6667, E-ISSN 2150-3435, Vol. 62, no 13, p. 2072-2082Article in journal (Refereed) Published
Abstract [en]

Multiple segmented rating curves have been proposed to better capture the variability of the physical and hydraulic characteristics of river-floodplain systems. We evaluate the accuracy of one- and two-segmented rating curves by exploiting a large and unique database of direct measurements of stage and discharge data in more than 200 Swedish catchments. Such a comparison is made by explicitly accounting for the potential impact of measurement uncertainty. This study shows that two-segmented rating curves did not fit the data significantly better, nor did they generate fewer errors than one-segmented rating curves. Two-segmented rating curves were found to be slightly beneficial for low flow when there were strong indications of segmentation, but predicted the rating relationship worse in cases of weak indication of segmentation. Other factors were found to have a larger impact on rating curve errors, such as the uncertainty of the discharge measurements and the type of regression method.

Place, publisher, year, edition, pages
2017. Vol. 62, no 13, p. 2072-2082
Keyword [en]
rating curve, river discharge, gauging station, uncertainty, overfitting, validation
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-343339DOI: 10.1080/02626667.2017.1367397ISI: 000416844300002OAI: oai:DiVA.org:uu-343339DiVA, id: diva2:1190170
Available from: 2018-03-13 Created: 2018-03-13 Last updated: 2018-03-13Bibliographically approved

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Sörengård, MattiasDi Baldassarre, Giuliano

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