Lhomme Jean-Paul, Boudhina N., Masmoudi M. M. (2014). Technical note : on the Matt-Shuttleworth approach to estimate crop water requirements. Hydrology and Earth System Sciences, 18 (11), p. 4341-4348. ISSN 1027-5606.
Titre du document
Technical note : on the Matt-Shuttleworth approach to estimate crop water requirements
Hydrology and Earth System Sciences, 2014,
18 (11), p. 4341-4348 ISSN 1027-5606
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.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Bioclimatologie [072]
