ET estimation for olive orchards using satellite-based energy balance and ET simulation

摘要

Evapotranspiration (ET) from olive fields located in Andalusia, Spain, was evaluated using the METRIC satellite-based energy balance method. The model was compared against FAO 56-based ET estimations from non-irrigated olive fields where rainfall was known. The first comparisons suggested some over-estimations of ET by METRIC as it used a general equation for momentum roughness length (z_(om)) based on a fixed function of height. The Perrier function and improved olive heights were used in METRIC for the determination of improved z_(om). This approach provided good results when compared to ET estimates based on FAO 56 for rainfed olive orchards (RMSE = 0.25 mm/d).