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| Titel |
Groundwater evapotranspiration estimation with the help of the linear storage model |
| VerfasserIn |
Péter Kalicz, Zoltán Gribovszki |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039817
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| Zusammenfassung |
| Discharge measuring is a common method in the hydrological research. While the continuous
discharge time series is determined by the rainfall, the riparian vegetation have great effect on
the falling limb of the hydrograph. The information enclosed in the falling limb can be
subtracted with help of the linear storage model. The initial time point of the recession has
not an influence on the parameters of the model and can be fit as an exponential curve with
the method of linear regression.
The apparent residence time, which is calculated by the linear storage model, changes
parallel with the transpiration intensity during the growing season. The evapotranspiration of
the riparian zone can be estimated with the help of this strong relationship. In the first step of
calculation it is necessary to determine a transpiration-free, mean residence time. This
number is calculated from hydrographs during late-winter or early-spring floods, before the
plants break the dormancy in temperated climate. The evapotranspiration can be expressed
from the combination of the linear storage model and the water balance of the recession
period.
The method was tested in the fully forest covered Hidegvíz Valley experimental
catchment. The 6 km2 catchment located in the Sopron Hills (Hungary) at the Austrian
border region. The processed time series are measured in two neighboring sub-catchments
(Farkas Valley and the Vadkan Valley). The method gives reasonable groundwater
evapotranspiration values compared to other estimations. |
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