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| Titel |
Evaluating effects of DEM resolution on distributed Grid-Xinanjiang model response |
| VerfasserIn |
C. Yao, K. Liu, Z. Li |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250058545
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| Zusammenfassung |
| Digital elevation model (DEM) resolution is a sensitive issue in distributed hydrologic
modeling. Assessing the impact of adaptive resolution on rainfall-runoff response
is important for determining the level of detail required in a spatially distributed
model.
The Grid-Xinanjiang model is utilized in this study to examine how sensitive the
distributed model was to the varied DEM resolutions while simulating hydrologic processes
and forecasting flood events in watersheds. The model parameters are a priori estimated by
employing a physically, empirically based approach using geographically based information.
The Grid-Xinanjiang model is applied at five different grid cell sizes ranging from 90 m to 1
km to the Tunxi watershed located in Anhui province, China. Comparison with available
observations indicates that the flow routing parameters of this model are indeed sensitive to
the spatial resolutions. However, the runoff generation parameters do not show the same
trend, which demonstrate that the a priori estimation of these parameters are less scale
dependent.
In addition, through the use of two distribution curves, we analyze the rainfall-runoff
response within each grid cell taking consideration of spatial variability of tension and free
water storage; however, simulations do not exhibit better hydrologic performance in this case. |
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