فهرست نشریات علمی دسترسی آزاد ایران

To estimate potential evapotranspiration, many relationships based on the climatic conditions of different regions have been proposed by researchers, which need to be evaluated and calibrated before applying them to specific locations. Each of these relationships has different functions depending on the climatic conditions. This study aimed to optimize temperature and radiation models for estimating ET 0 at the Jolfa synoptic station. The Penman-Monteith model served as a benchmark for evaluating these models. Calibration was performed using linear and power equations. The t-test results indicated that there was no significant difference between the ET 0 values obtained from the Hargreaves, Linacre, and Jensen-Haise methods compared to the standard FAO56-Penman-Monteith method. Among the methods used, the Thornthwaite method had the highest coefficient of determination, with values above 0.891 across all months. The Hargreaves and Linacre methods showed the strongest correlation with the Penman-Monteith method after Thornthwaite, with determination coefficients of 0.883 and 0.874, respectively. Consequently, using the Thornthwaite, Hargreaves, and Linacre methods, after applying calibration coefficients, is recommended for estimating ET 0 in the study area.