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| Titel |
The UP modelling system for large scale hydrology: simulation of the Arkansas-Red River basin |
| VerfasserIn |
C. G. Kilsby, J. Ewen, W. T. Sloan, A. Burton, C. S. Fallows, P. E. O'Connell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 3, no. 1 ; Nr. 3, no. 1, S.137-149 |
| Datensatznummer |
250000761
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| Publikation (Nr.) |
 copernicus.org/hess-3-137-1999.pdf |
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| Zusammenfassung |
| The UP (Upscaled Physically-based) hydrological modelling
system to the Arkansas-Red River basin (USA) is designed for macro-scale simulations of
land surface processes, and aims for a physical basis and, avoids the use of discharge
records in the direct calibration of parameters. This is achieved in a two stage process:
in the first stage parametrizations are derived from detailed modelling of selected
representative small and then used in a second stage in which a simple distributed model
is used to simulate the dynamic behaviour of the whole basin. The first stage of the
process is described in a companion paper (Ewen et al., this issue), and the second stage
of this process is described here. The model operated at an hourly time-step on 17-km grid
squares for a two year simulation period, and represents all the important hydrological
processes including regional aquifer recharge, groundwater discharge, infiltration- and
saturation-excess runoff, evapotranspiration, snowmelt, overland and channel flow. Outputs
from the model are discussed, and include river discharge at gauging stations and
space-time fields of evaporation and soil moisture. Whilst the model efficiency assessed
by comparison of simulated and observed discharge records is not as good as could be
achieved with a model calibrated against discharge, there are considerable advantages in
retaining a physical basis in applications to ungauged river basins and assessments of
impacts of land use or climate change. |
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