Simple daily ET0 estimation techniques

Abstract

A reliable estimation of the reference evapotranspiration (ET0) is of critical importance for irrigation systems' design. The goals of this research are: firstly, comparison of the evaporation methods, and secondly, analysis whether the evaporation of a Class A pan can be used as a substitution for FAO-56 PM method. In the paper, a comparison of the evaporation methods is done on the basis of the daily data from the Griffith station, Australia. It can be concluded that the Christiansen method is in better agreement with the FAO-56 PM method than the FAO-24 pan method. One of the reasons for a better agreement is a larger number of climatic parameters used than in FAO-24 pan method. The research has demonstrated that the evaporation data can be used as a substitution for FAO-56 PM ET0.Pouzdani proracun referentne evapotranspiracije (ET0) od sustinske je vaznosti pri projektovanju hidromelioracionih sistema. Ciljevi ovog istrazivanja su: prvo, uporedjivanje evaporacionih metoda i drugo, analiziranje da li evaporacija sa suda klase A moze da se koristi kao zamena za FAO-56 PM metod. U radu se vrsi uporedjivanje evaporacionih metoda na osnovu podataka sa stanice Griffith. Moze se zakljuciti da Christiansen metoda ima bolje slaganje sa FAO-56 PM metodom u poredjenju sa FAO-24 pan metodom. Jedan od razloga za bolje slaganje je veci broj koriscenih klimatskih parametara od FAO-24 pan metode. Istrazivanje je pokazalo da se podaci o evaporaciji mogu koristiti kao zamena za FAO-56 PM ET0.