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| Titel |
Generating reference evapotranspiration surfaces from the Hargreaves equation at watershed scale |
| VerfasserIn |
C. Aguilar, M. J. Polo |
| 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 ; 15, no. 8 ; Nr. 15, no. 8 (2011-08-11), S.2495-2508 |
| Datensatznummer |
250012922
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| Publikation (Nr.) |
 copernicus.org/hess-15-2495-2011.pdf |
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| Zusammenfassung |
| In this study, Hargreaves' formulation is considered to be appropriate for
the water and energy balance at a daily scale due to its simplicity of
application once the distributed values of temperature are available at cell
scale. However, the coefficient of the Hargreaves equation must be
previously calibrated. The interplay of different factors at different
temporal scales became evident in the calibration process at the local scale
of weather stations. The best fits against daily estimates by ASCE-PM were
achieved when differentiating between the wet and the dry season. For the
spatial distribution of Hargreaves coefficient at watershed scale, a
regionalization in the area around each weather station was proposed in
terms of areas of influence. The best results at watershed scale were
obtained after a spatial correction for alpine areas, when the average of
the difference cell by cell between ASCE-PM and Hargreaves's distributed
daily estimates were 0.02 and 0.15 mm day−1 for the wet and the dry
seasons, respectively. In all the cases, the best interpolation results were
obtained using C-I (calculate and interpolate) procedures. |
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