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| Titel |
On the influence of cell size in physically-based distributed hydrological modelling to assess extreme values in water resource planning |
| VerfasserIn |
M. Egüen, C. Aguilar, J. Herrero, A. Millares, M. J. Polo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 5 ; Nr. 12, no. 5 (2012-05-21), S.1573-1582 |
| Datensatznummer |
250010822
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1573-2012.pdf |
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| Zusammenfassung |
| This paper studies the influence of changing spatial resolution on the
implementation of distributed hydrological modelling for water resource
planning in Mediterranean areas. Different cell sizes were used to
investigate variations in the basin hydrologic response given by the model
WiMMed, developed in Andalusia (Spain), in a selected watershed. The model
was calibrated on a monthly basis from the available daily flow data at the
reservoir that closes the watershed, for three different cell sizes, 30,
100, and 500 m, and the effects of this change on the hydrological response
of the basin were analysed by means of the comparison of the hydrological
variables at different time scales for a 3-yr-period, and the effective
values for the calibration parameters obtained for each spatial resolution.
The variation in the distribution of the input parameters due to using
different spatial resolutions resulted in a change in the obtained
hydrological networks and significant differences in other hydrological
variables, both in mean basin-scale and values distributed in the cell
level. Differences in the magnitude of annual and global runoff, together
with other hydrological components of the water balance, became apparent.
This study demonstrated the importance of choosing the appropriate spatial
scale in the implementation of a distributed hydrological model to reach a
balance between the quality of results and the computational cost; thus,
30 and 100-m could be chosen for water resource management, without
significant decrease in the accuracy of the simulation, but the 500-m cell
size resulted in significant overestimation of runoff and consequently,
could involve uncertain decisions based on the expected availability of
rainfall excess for storage in the reservoirs. Particular values of the
effective calibration parameters are also provided for this hydrological
model and the study area. |
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