Abstract
The method presented to calculate evapotranspiration daily total allows estimation of it and its components (transpiration, evaporation) from homogeneous evaporating surfaces. The method denoted as combination method is based in principle on the Penman-Monteith equation with modifications in calculation canopy resistance (using the Obuchov-Monin approach) and using empirical formulas to calculate evapotranspiration structure. Calculation is done using the so-called two-step method: potential evapotranspiration is calculated first, and the actual value is calculated using the relative evapotranspiration soil water content relationship. Input data necessary to calculate it are plant characteristics (roughness length, leaf area index), standard meteorological data (air temperature, air humidity, sunshine duration, wind velocity), and soil root zone water content. Latitude of the site is needed to calculate net radiation. This chapter contains all the necessary tables needed to calculate daily rates of evapotranspiration; no other sources are needed.
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Novák, V. (2012). Combination Method of Daily Evapotranspiration Calculation. In: Evapotranspiration in the Soil-Plant-Atmosphere System. Progress in Soil Science. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-3840-9_11
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DOI: https://doi.org/10.1007/978-94-007-3840-9_11
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