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| Titel |
Impacts of spatial data resolution on simulated discharge, a case study of Xitiaoxi catchment in South China |
| VerfasserIn |
G. J. Zhao, G. Hörmann, N. Fohrer, J. F. Gao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Transdisciplinary concepts and modelling strategies for the assessment of complex environmental systems ; Nr. 21 (2009-08-12), S.131-137 |
| Datensatznummer |
250014539
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| Publikation (Nr.) |
 copernicus.org/adgeo-21-131-2009.pdf |
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| Zusammenfassung |
| In this paper we analyse the effects of different spatial input data
resolution on water balance simulation using a simple distributed
hydrological model: PCR-XAJ model. A data set consisting of land use and
digital elevation model at 25 m resolution of Xitiaoxi catchment in South China
is used for investigation. The model was first calibrated and
validated at 50 m cell size, thereafter an aggregation of the digital
elevation model (DEM) and land use maps at 100 m, 200 m, 300 m, 500 m and 1 km
are applied to evaluate the effects of spatial data resolution on simulated
discharge. The simulation results at a grid size of 50 m show a good
correlation between measured and simulated daily flows at Hengtangcun
station with Nash-Suttcliffe efficiency larger than 0.75 for both
calibration and validation periods. In contrast, the model performs slightly
worse at Fanjiacun station. The increasing grid size affects the
characteristics of the slope and land use aggregation and causes important
information loss. The aggregation of input data does not lead to significant
errors up to a grid of 1 km. Model efficiencies decrease slightly with cell
size increasing, and more significantly up to the grid size of 1 km. |
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