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| Titel |
Analysis of the suitability of the German soil texture classification for the regional scale application of physical based hydrological model |
| VerfasserIn |
H. Bormann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Large-scale hydrological modelling and the European Union water policies ; Nr. 11 (2007-05-16), S.7-13 |
| Datensatznummer |
250009002
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| Publikation (Nr.) |
 copernicus.org/adgeo-11-7-2007.pdf |
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| Zusammenfassung |
| Regional scale hydrological simulations are mostly based on the use of
standard data sets such as soil maps which are based on soil texture
classification schemes. This paper analyses the suitability of the German
soil texture classification for the application of a physically based
soil-vegetation-atmosphere-transfer scheme. Theoretical soil columns are
defined to be able to represent the entire soil texture triangle by a 1%
grid of the three particle size classes: sand, clay and silt. These
theoretical soil columns are characterized by a homogenous soil texture and
consist of two layers of increasing bulk density and decreasing content of
organic matter with depth. Soil hydraulic parameterisation is derived by
applying a pedotransfer function. Continuous water balance calculations are
carried out for a ten year period for all grid cells of the 1% grid. The
results of the water balance calculations are compared to the simulation
results of the centre of gravity of the respective soil texture class.
Texture class specific mean deviations and root mean squared deviations are
calculated from the differences between the 1% pixels and texture class
representatives. The results reveal that the loam and silt texture classes
show only small deviations from the centres of gravity. For a few sand
texture classes and most of the clay texture classes deviations are
considerably large. Assuming an equal distributed probability of occurrence
of all realisations within a soil texture class, an uncertainty of more than
100 mm/a with respect to runoff and actual evapotranspiration is detected
for four clay texture classes, two sand texture classes and one silt texture
class. These results are confirmed by a sensitivity analysis investigating
the model response for a grid cell compared to the neighboured grid cells.
High sensitivities mainly appear for sandy and clayey soils while the
sensitivity of the model for loam and silt soils is smaller. Resuming it can
be stated that most of the texture classes of the German texture
classification scheme are suitable for the application of a physically based
model, on regional scale in particular. Clay texture classes can be expected
to cause high simulation uncertainties. |
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