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Status: Bibliographieeintrag

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Verfasst von:Bauser, Hannes [VerfasserIn]   i
 Jaumann, Stefan [VerfasserIn]   i
 Berg, Daniel [VerfasserIn]   i
 Roth, Kurt [VerfasserIn]   i
Titel:EnKF with closed-eye period - towards a consistent aggregation of information in soil hydrology
Verf.angabe:Hannes H. Bauser, Stefan Jaumann, Daniel Berg, and Kurt Roth
E-Jahr:2016
Jahr:19 December 2016
Umfang:16 S.
Fussnoten:Gesehen am 04.05.2020
Titel Quelle:Enthalten in: Hydrology and earth system sciences
Ort Quelle:Katlenburg-Lindau : EGU, 1997
Jahr Quelle:2016
Band/Heft Quelle:20(2016), 12, Seite 4999-5014
ISSN Quelle:1607-7938
Abstract:The representation of soil water movement exposes uncertainties in all model components. We assess the key uncertainties for the specific hydraulic situation of a 1-D soil profile with TDR (time domain reflectometry)-measured water contents. The uncertainties addressed are initial condition, soil hydraulic parameters, small-scale heterogeneity, upper boundary condition, and the local equilibrium assumption by the Richards equation. We employ an ensemble Kalman filter (EnKF) with an augmented state to represent and estimate all key uncertainties, except for the intermittent violation of the local equilibrium assumption. For the latter, we introduce a closed-eye EnKF to bridge the gap. Due to an iterative approach, the EnKF was capable of estimating soil parameters, Miller scaling factors and upper boundary condition based on TDR measurements during a single rain event. The introduced closed-eye period ensured constant parameters, suggesting that they resemble the believed true material properties. This closed-eye period improves predictions during periods when the local equilibrium assumption is met, but requires a description of the dynamics during local nonequilibrium phases to be able to predict them. Such a description remains an open challenge. Finally, for the given representation our results show the necessity of including smallscale heterogeneity. A simplified representation with Miller scaling already yielded a satisfactory description.
DOI:doi:10.5194/hess-20-4999-2016
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.5194/hess-20-4999-2016
 Volltext: https://www.hydrol-earth-syst-sci.net/20/4999/2016/
 DOI: https://doi.org/10.5194/hess-20-4999-2016
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1697008208
Verknüpfungen:→ Zeitschrift

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