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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 2
Hydrol. Earth Syst. Sci., 16, 375–390, 2012
https://doi.org/10.5194/hess-16-375-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Latest advances and developments in data assimilation for...

Hydrol. Earth Syst. Sci., 16, 375–390, 2012
https://doi.org/10.5194/hess-16-375-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 08 Feb 2012

Research article | 08 Feb 2012

The importance of parameter resampling for soil moisture data assimilation into hydrologic models using the particle filter

D. A. Plaza1, R. De Keyser2, G. J. M. De Lannoy1, L. Giustarini3, P. Matgen3, and V. R. N. Pauwels1 D. A. Plaza et al.
  • 1Laboratory of Hydrology and Water Management, Ghent University, Ghent, Belgium
  • 2Department of Electrical energy, Systems and Automation, Ghent University, Ghent, Belgium
  • 3Centre de Recherche Public – Gabriel Lippmann, Département Environnement et Agrobiotechnologies, Belvaux, Luxembourg

Abstract. The Sequential Importance Sampling with Resampling (SISR) particle filter and the SISR with parameter resampling particle filter (SISR-PR) are evaluated for their performance in soil moisture assimilation and the consequent effect on baseflow generation. With respect to the resulting soil moisture time series, both filters perform appropriately. However, the SISR filter has a negative effect on the baseflow due to inconsistency between the parameter values and the states after the assimilation. In order to overcome this inconsistency, parameter resampling is applied along with the SISR filter, to obtain consistent parameter values with the analyzed soil moisture state. Extreme parameter replication, which could lead to a particle collapse, is avoided by the perturbation of the parameters with white noise. Both the modeled soil moisture and baseflow are improved if the complementary parameter resampling is applied. The SISR filter with parameter resampling offers an efficient way to deal with biased observations. The robustness of the methodology is evaluated for 3 model parameter sets and 3 assimilation frequencies.

Overall, the results in this paper indicate that the particle filter is a promising tool for hydrologic modeling purposes, but that an additional parameter resampling may be necessary to consistently update all state variables and fluxes within the model.

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