Comparison of daily potential evapotranspiration calculated by two procedures based on Penman-Monteith type equation
2013
Hlaváčiková, H., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Hydrology | Novák, V., Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Hydrology
Paper presents comparison of the daily reference crop (grass vegetation cover) potential evapotranspiration results calculated by the two modifications of the Penman-Monteith type equation. The first modification was published in FAO recommendation (Allen at al., 1998), PM-FAO, the second is modification according to Budagovskiy (1964) and Novak (1995), PM-BN. Both are used in soil water simulation models HYDRUS-1D and GLOBAL. Calculations were performed for frost-free seasons of the years 2000–2009, using the meteorological station Gabcikovo (South Slovakia) meteorological data and canopy characteristics. The results indicate significant differences in daily and seasonal potential evapotranspiration. Reasons for those differences are discussed; they should be in different net radiation and aerodynamic resistance estimation methods.
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