Evaluation of pan coefficient equations in a semi-arid Mediterranean environment using the ASCE-standardized Penman-Monteith methodReport as inadecuate




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Reference crop evapotranspiration ETo is essential for irrigation, water resources management and environmental assessment. The indirect estimation of ETo is based a on energy budget approach using meteorological data and b pan evaporation measurements Epan multiplied by pan coefficients kp adapted to the surrounding environmental conditions. Significant interest is shown for the kp equations, which have to be tested before their use. The purpose of this study is to evaluate six different kp equations, such as those of Cuenca, Allen and Puitt, Snyder, Pereira et al., Orang, Raghuwanshi and Wallender for the summer growing season April to October of Thessaloniki plain in Greece, which is characterized by a semi-arid Mediterranean environment. The evaluation of the kp equations is performed by two years Epan measurements, using as reference the daily ETo values estimated by the ASCE-standardized Penman-Monteith equation ASCE-PM in hourly time step. The results of this study showed that Cuenca’s equation provided more accurate daily estimations. Additional analysis is performed in other methods such as those of FAO-56 and Hargreaves based on the calculation time step hourly or daily and their correspondence to the ASCE-PM.

KEYWORDS

Pan Evaporation; Reference Evapotranspiration; ASCE-Standardized Penman-Monteith

Cite this paper

G. Aschonitis, V. , Z. Antonopoulos, V. and M. Papamichail, D. 2012 Evaluation of pan coefficient equations in a semi-arid Mediterranean environment using the ASCE-standardized Penman-Monteith method. Agricultural Sciences, 3, 58-65. doi: 10.4236-as.2012.31008.





Author: Vassilis G. Aschonitis, Vassilis Z. Antonopoulos, Dimitris M. Papamichail

Source: http://www.scirp.org/



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