Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Using a bias aware EnKF to account for unresolved structure in an unsaturated zone model
Autor Erdal, D.; Neuweiler, I.; Wollschläger, U.
Journal / Serie Water Resources Research
Erscheinungsjahr 2014
Department MET
Band/Volume 50
Heft 1
Seite von 132
Seite bis 147
Sprache englisch
Keywords unsaturated zone; EnKF; bias correction; model error; unresolved structure; parameter estimation
UFZ Querschnittsthemen RU5;
Abstract When predicting flow in the unsaturated zone, any method for modeling the flow will have to define how, and to what level, the subsurface structure is resolved. In this paper, we use the Ensemble Kalman Filter to assimilate local soil water content observations from both a synthetic layered lysimeter and a real field experiment in layered soil in an unsaturated water flow model. We investigate the use of colored noise bias corrections to account for unresolved subsurface layering in a homogeneous model and compare this approach with a fully resolved model. In both models we use a simplified model parameterization in the Ensemble Kalman Filter. The results show that the use of bias corrections can increase the predictive capability of a simplified homogeneous flow model if the bias corrections are applied to the model states. If correct knowledge of the layering structure is available, the fully resolved model performs best. However, if no, or erroneous, layering is used in the model, the use of a homogeneous model with bias corrections can be the better choice for modeling the behavior of the system.
dauerhafte UFZ-Verlinkung
Erdal, D., Neuweiler, I., Wollschläger, U. (2014):
Using a bias aware EnKF to account for unresolved structure in an unsaturated zone model
Water Resour. Res. 50 (1), 132 - 147