Determination of Reference Evapotranspiration Using Penman-Monteith Method in Case of Missing Wind Speed Data under Subhumid Climatic Condition in Hungary
- 1 Department of Water and Environmental Sciences, Széchenyi István University of Győr, Mosonmagyaróvár, Hungary
- 2 Department of Water and Environmental Sciences, Széchenyi István University of Győr, Mosonmagyaróvár, Hungary
- 3 Department of Water and Environmental Sciences, Széchenyi István University of Győr, Mosonmagyaróvár, Hungary
Abstract
Th e reference evapotranspiration was calculated using Penman-Monteith m ethod proposed. This method was evaluated on data measured by lysimeter in Szarv as experimental station in Hungary. The results of the two method s were in good agreement. However , this method requires an amount of data which is not available at all site s of meteorological measurement. Therefore it was necessary to investigate which elements influencing evapotranspiration are important and which elements are less important. With the help of investigation was indicated that radiation and vapor pressure deficit play important role in determination of reference evapotranspiration. Taking into account this there was two possibilit ies to calculate evapotranspiration. One of these is to use Penman-Monteith formula with constant wind speed as advised by Allen. Another one is to neglect wind speed data. Both methods were investigated and the method with constant wind speed was found better in a subhumid climatic condition of Hungary.
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