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| Titel |
Multiscale investigations in a mesoscale catchment – hydrological modelling in the Gera catchment |
| VerfasserIn |
P. Krause, F. Bäse, U. Bende-Michl, M. Fink, W. Flügel, B. Pfennig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Integration of hydrological models on different spatial and temporal scales ; Nr. 9 (2006-09-26), S.53-61 |
| Datensatznummer |
250006572
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| Publikation (Nr.) |
 copernicus.org/adgeo-9-53-2006.pdf |
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| Zusammenfassung |
The application of the hydrological process-oriented model J2000 (J2K) is
part of a cooperation project between the Thuringian Environmental Agency
(Thüringer Landesanstalt für Umwelt und Geologie – TLUG) and the
Department of Geoinformatics of the Friedrich-Schiller-University Jena
focussing on the implementation of the EU water framework directive (WFD). In
the first project phase J2K was parametrised and calibrated for a mesoscale
catchment to quantify if it can be used as hydrological part of a
multi-objective tool-box needed for the implementation of the WFD. The main
objectives for that pilot study were:
- The development and application of a suitable distribution concept
which provide the spatial data basis for various tasks and which reflects
the specific physiogeographical variability and heterogeneity of river
basins adequately. This distribution concept should consider the following
constraints: The absolute number of spatial entities, which forms the basis
for any distributive modelling should be as small as possible, but the
spatial distributed factors, which controls quantitative and qualitative
hydrological processes should not be generalised to much. The distribution
concept of hydrological response units HRUs (Flügel, 1995) was selected and
enhanced by a topological routing scheme (Staudenrausch, 2001) for the
simulation of lateral flow processes.
- J2K should be calibrated for one subbasin of the pilot watershed only.
Then the parameter set should be used on the other subbasins (referred as
transfer basins) to investigate and quantify the transferability of a
calibrated model and potential spatial dependencies of its parameter set.
In addition, potential structural problems in the process description
should be identified by the transfer to basins which show a different
process dominance as the one which was used for calibration does.
- Model calibration and selection of efficiency criteria for the
quantification of the model quality should be based on a comprehensive
sensitivity and uncertainty analysis (Bäse, 2005) and multi-response
validations with independent data sets (Krause and Flügel, 2005) carried out
in advance in the headwater part of the calibration basin.
- To obtain good results in the transfer basins the calibrated
parameter set could be adjusted slightly. This step was considered as
necessary because of specific constraints which were not of significant
importance in the calibration basin. This readjustment should be carried
out on parameters which show a sensitive reaction on the identified
differences in the environmental setup.
- Potential scaling problems of the process description, distribution
concept or model structure should be identified by the comparison of the
modelling results obtained in a small headwater region of the calibration
basin with observed streamflow to find out if the selected efficiency
measures show a significant change.
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