Accurate Computation of a Streamflow Drought Index
Publication: Journal of Hydrologic Engineering
Volume 17, Issue 2
Abstract
In this study, the authors investigated an approach to calculate the standardized streamflow index (SSI), which allows accurate spatial and temporal comparison of the hydrological conditions of a stream or set of streams. For this purpose, the capability of six three-parameter distributions (lognormal, Pearson Type III, log-logistic, general extreme value, generalized Pareto, and Weibull) and two different approaches to select the most suitable distribution the best monthly fit (BMF) and the minimum orthogonal distance (MD), were tested by using a monthly streamflow data set for the Ebro Basin (Spain). This large Mediterranean basin is characterized by high variability in the magnitude of streamflows and in seasonal regimes. The results show that the most commonly used probability distributions for flow frequency analysis provided good fits to the streamflow series. Thus, the visual inspection of the -moment diagrams and the results of the Kolmogorov-Smirnov test did not enable the selection of a single optimum probability distribution. However, no single probability distribution for all the series was suitable for obtaining a robust standardized streamflow series because each of the distributions had one or more limitations. The BMF and MD approaches improved the results in the expected average, standard deviation, and the frequencies of extreme events of the SSI series in relation to the selection of a unique distribution for each station. The BMF and MD approaches involved using different probability distributions for each gauging station and month of the year to calculate the SSI. Both approaches are easy to apply and they provide very similar results in the quality of the obtained hydrological drought indexes. The proposed procedures are very flexible for analyses involving contrasting hydrological regimes and flow characteristics.
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Acknowledgments
This work has been supported by research projects grant numbers UNSPECIFIEDCGL2008-01189/BTE and UNSPECIFIEDCGL2006-11619/HID financed by the Spanish Commission of Science and Technology and FEDER; EUROGEOSS grant number (UNSPECIFIEDFP7-ENV-2008-1-226487), and ACQWA grant number (UNSPECIFIEDFP7-ENV-2007-1-212250) financed by the VII Framework Programme of the European Commission; and “Las sequías climáticas en la cuenca del Ebro y su respuesta hidrológica” and “La nieve en el Pirineo aragonés: Distribución espacial y su respuesta a las condiciones climáticas” financed by “Obra Social La Caixa” and the Aragón government.
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Published In
Journal of Hydrologic Engineering
Volume 17 • Issue 2 • February 2012
Pages: 318 - 332
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© 2012 American Society of Civil Engineers.
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Received: Sep 20, 2010
Accepted: May 19, 2011
Published online: May 21, 2011
Published in print: Feb 1, 2012
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