Improving potential evapotranspiration prediction accuracy using advanced machine learning models: a case study in Ahvaz, Iran
Jamshid Bani Feri , Aslan Egdernezhad , Ali Mokhtaran , Mahdi Asadilour , Davoud Khodadadi Dehkordi
AIMS Environmental Science ›› 2025, Vol. 12 ›› Issue (5) : 770 -794.
Accurate forecasting of daily potential evapotranspiration (ETo) is vital for efficient irrigation scheduling, sustainable water resource management, and optimal crop yield, especially in arid regions. In this study, we present a novel, large-scale comparison of three advanced machine learning models, Support Vector Machine (SVM), Artificial Neural Network (ANN), and Gene Expression Programming (GEP), for ETo prediction at the Ahvaz synoptic station in Iran. The work is distinctive in using one of the longest ETo datasets available (1979–2023; 16,084 records), incorporating a sensitivity analysis for input selection, and applying the Developed Discrepancy Ratio (DDR) as an advanced performance metric. The ANN model (MLP 4-9-1 architecture) demonstrated the highest prediction accuracy, achieving an R² of 0.9806, RMSE of 0.4122, and DDRmax of 3.27 in the training phase, and an R² of 0.9779, RMSE of 0.4327, and DDRmax of 3.22 during validation. In comparison, SVM and GEP models showed lower accuracy across all phases. These results highlight the superior capability of the ANN model for ETo forecasting and its potential as a reliable tool for irrigation planning and water resource management in arid regions like Ahvaz.
climate / artificial intelligence / dry region / water cycle / performance assessment
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