Abstract
A model for predicting the reference evapotranspiration ETo in arid areas was developed and evaluated. The model was developed based on the Jensen-Heise model with added coefficients and the original coefficients of the model were calibrated for the conditions of the area. For evaluation, the ETo values of the model were compared to the ETo values obtained using the FAO Penman Monteith method. The model was also evaluated using a set of weather data (14 years of data) obtained from a location 350 km from the original site. The model improved the prediction at the original site reducing the overall Mean Absolute error (MAE)from1.62 using the Jensen-Heise model to 0.84 using the Modified Jensen-Heise (MJH) model. Calibrating the values of the coefficients to the new location improved the performance of the model and made it better than the Jensen-Heise model decreasing the overall MAE from 2.75 for the Jensen-Heise model to 1.24 and 1.22 for the 3 and the 14 years calibration, respectively.
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