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| Titel |
Technical Note: On the Matt-Shuttleworth approach to estimate crop water requirements |
| VerfasserIn |
J. P. Lhomme, N. Boudhina, M. M. Masmoudi |
| 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 ; 18, no. 11 ; Nr. 18, no. 11 (2014-11-04), S.4341-4348 |
| Datensatznummer |
250120513
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| Publikation (Nr.) |
 copernicus.org/hess-18-4341-2014.pdf |
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| Zusammenfassung |
| The Matt–Shuttleworth method provides a way to make a
one-step estimate of crop water requirements with the Penman–Monteith
equation by translating the crop coefficients, commonly available in
United Nations Food and Agriculture Organization (FAO) publications, into equivalent surface resistances. The methodology is based
upon the theoretical relationship linking crop surface resistance to a crop
coefficient and involves the simplifying assumption that the reference crop
evapotranspiration (ET0) is equal to the Priestley–Taylor estimate with a
fixed coefficient of 1.26. This assumption, used to eliminate the dependence
of surface resistance on certain weather variables, is questionable;
numerical simulations show that it can lead to substantial differences
between the true value of surface resistance and its estimate. Consequently,
the basic relationship between surface resistance and crop coefficient,
without any assumption, appears to be more appropriate for inferring crop
surface resistance, despite the interference of weather variables. |
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