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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 8
Hydrol. Earth Syst. Sci., 14, 1681–1695, 2010
https://doi.org/10.5194/hess-14-1681-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 14, 1681–1695, 2010
https://doi.org/10.5194/hess-14-1681-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Aug 2010

30 Aug 2010

Possibilistic uncertainty analysis of a conceptual model of snowmelt runoff

A. P. Jacquin A. P. Jacquin
  • Facultad de Ingeniería, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147, Valparaíso, Chile

Abstract. This study presents the analysis of predictive uncertainty of a conceptual type snowmelt runoff model. The method applied uses possibilistic rather than probabilistic calculus for the evaluation of predictive uncertainty. Possibility theory is an information theory meant to model uncertainties caused by imprecise or incomplete knowledge about a real system rather than by randomness. A snow dominated catchment in the Chilean Andes is used as case study. Predictive uncertainty arising from parameter uncertainties of the watershed model is assessed. Model performance is evaluated according to several criteria, in order to define the possibility distribution of the parameter vector. The plausibility of the simulated glacier mass balance and snow cover are used for further constraining the model representations. Possibility distributions of the discharge estimates and prediction uncertainty bounds are subsequently derived. The results of the study indicate that the use of additional information allows a reduction of predictive uncertainty. In particular, the assessment of the simulated glacier mass balance and snow cover helps to reduce the width of the uncertainty bounds without a significant increment in the number of unbounded observations.

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