Calibration of the Priestley-Taylor parameter to estimate evapotranspiration in rice paddy areas
DOI:
https://doi.org/10.5902/2179460X79096Keywords:
Evapotranspiration, Priestley-Taylor method, Rice paddyAbstract
Rice is one of the most important cereals in the world and requires a large amount of water due to flood irrigation cultivation. Estimation of evapotranspiration (ET) for rice paddy cropland by in situ measurements is still a limiting factor due to the high cost of equipment and specialized labor. The Penman-Monteith (PM) method is considered the most complete, but requires a large amount of information. The Priestley-Taylor method (PT) is a simplification of the PM method using a smaller number of environmental variables and the energy available in the ecosystem. Several papers in the literature have presented calibrations for the α-coefficient of PT. However, these calibrations must be performed according to the climatic and surface characteristics of each region. Therefore, the aim of this work is to propose a calibration of the PT coefficient for ET estimates in rice paddy areas, using a simpler method. For this purpose, two experimental sites in southern Brazil were used. The simulated results were compared with data obtained using the Eddy Covariance technique (EC). The α-parameter of 1.22 proved to be efficient for ET estimations in rice paddy areas.
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