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Istituto Agronomico Mediterraneo di Bari (IAMB) 1998

High-precision weighing-lysimeter measurements of daily alfalfa evapotranspiration in Egypt : comparison with the Penman-Monteith estimate

ABDEL-FATTAH Hamed

Titre : High-precision weighing-lysimeter measurements of daily alfalfa evapotranspiration in Egypt : comparison with the Penman-Monteith estimate

Auteur : ABDEL-FATTAH Hamed

Etablissement de soutenance : Istituto Agronomico Mediterraneo di Bari (IAMB) - Centre international de hautes études agronomiques méditerranéennes (CIHEAM)

Grade : Master of Science : Land and water resource management : irrigated agriculture 1998

Résumé
Tests world-wide have shown how the FAO Penman-Monteith equation (FAOPM) has the most behavior, under many environmental conditions. Nevertheless, in the Mediterranean region the FAO-PM showed to underestimate the reference evapotranspiration (ETo). Different hypotheses have been formulated to explain such underestimation : data quality, time-scale problem of the data (Hourly, daily) ; difference in adjusted boundary between ETo estimated by the FAO-PM (using weather data obtained from calibrated brand-new sensor installed in the agro-meteorological station) and ETo measured by a high-precision weighing lysimeter (cropped with alfalfa Medicago sativa L.), in Egypt. ETo was estimated also using the KimberlyPenman equation (KP). The results showed that the FAO-Penman, as well as the KP, underestimated the lysimeter ETo up to about 30%. The hypotheses on the data quality, boundary layers, canopy resistance and time-scale problems are not sufficient to explain the underestimation observed. The remaining hypothesis to test is the possible impact of the regional advection

Mots clés : evapotranspiration, ETo, Penman-Monteith.

Document source : page 65

Page publiée le 11 septembre 2018