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| Titel |
Kalman filters for assimilating near-surface observations into the Richards equation – Part 3: Retrieving states and parameters from laboratory evaporation experiments |
| VerfasserIn |
H. Medina, N. Romano, G. B. Chirico |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 7 ; Nr. 18, no. 7 (2014-07-04), S.2543-2557 |
| Datensatznummer |
250120406
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| Publikation (Nr.) |
 copernicus.org/hess-18-2543-2014.pdf |
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| Zusammenfassung |
| The purpose of this work is to evaluate the performance of a dual Kalman
filter procedure in retrieving states and parameters of a one-dimensional
soil water budget model based on the Richards equation, by assimilating
near-surface soil water content values during evaporation experiments carried out
under laboratory conditions. The experimental data set consists of
simultaneously measured evaporation rates, soil water content and matric
potential profiles. The parameters identified by assimilating the data
measured at 1 and 2 cm soil depths are in very good agreement with those
obtained by exploiting the observations carried out in the entire soil
profiles. A reasonably good correspondence has been found between the
parameter values obtained from the proposed assimilation technique and those
identified by applying a non-sequential parameter estimation method. The
dual Kalman filter also performs well in retrieving the water state in the
porous system. Bias and accuracy of the predicted state profiles are
affected by observation depth changes, particularly for the experiments
involving low state vertical gradients. The assimilation procedure proved
flexible and very stable in both experimental cases, independently from the
selected initial conditions and the involved uncertainty. |
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