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| Titel |
A comprehensive filtering scheme for high-resolution estimation of the water balance components from high-precision lysimeters |
| VerfasserIn |
M. Hannes, U. Wollschläger, F. Schrader, W. Durner, S. Gebler, T. Pütz, J. Fank, G. Unold, H.-J. Vogel |
| 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 ; 19, no. 8 ; Nr. 19, no. 8 (2015-08-04), S.3405-3418 |
| Datensatznummer |
250120779
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| Publikation (Nr.) |
 copernicus.org/hess-19-3405-2015.pdf |
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| Zusammenfassung |
| Large weighing lysimeters are currently the most precise method to directly
measure all components of the terrestrial water balance in parallel via the
built-in weighing system. As lysimeters are exposed to several external
forces such as management practices or wind influencing the weighing data,
the calculated fluxes of precipitation and evapotranspiration can be altered
considerably without having applied appropriate corrections to the raw data.
Therefore, adequate filtering schemes for obtaining most accurate estimates of
the water balance components are required. In this study, we use data from
the TERENO (TERrestrial ENvironmental
Observatories) SoilCan research site in Bad Lauchstädt to develop a comprehensive
filtering procedure for high-precision lysimeter data, which is designed to
deal with various kinds of possible errors starting from the elimination of
large disturbances in the raw data resulting e.g., from management practices
all the way to the reduction of noise caused e.g., by moderate wind.
Furthermore, we analyze the influence of averaging times and thresholds
required by some of the filtering steps on the calculated water balance and
investigate the ability of two adaptive filtering methods (the adaptive
window and adaptive threshold filter (AWAT filter; Peters et al., 2014), and
a new synchro filter applicable to the data from a set of several lysimeters)
to further reduce the filtering error. Finally, we take advantage of the data
sets of all 18 lysimeters running in parallel at the Bad Lauchstädt site to
evaluate the performance and accuracy of the proposed filtering scheme. For
the tested time interval of 2 months, we show that the estimation of the
water balance with high temporal resolution and good accuracy is possible.
The filtering code can be downloaded from the journal website as Supplement
to this publication. |
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