دراسة التبخر – نتح المرجعي في محافظة نينوى باستخدام عده نماذج رياضية

Daily out put from four evapotranspiration models (Hargreaves and samani, modified Blaney–Criddle, Kharrufa and Pan) have been tested against reference evapotranspiration data computed by FAO–56 Penman– Monteith model to asses the accuracy of each model in four locations in Ninava Governorate. In Mosul station Pan model was the most accurate model with mean absolute error (MAE) of (7.2%). In Rabiha Hargreaves and Samani model performed best with (MAE) of (7.5%). In Talafar modified Blaney–Criddle performed best with (MAE) of (4.2%). Finally in Albaagh Hargreaves and Samani performed best with (MAE) of (9.4%). Correlations were also found between the results of these four models and the results of the Panman Montieth model.Also correlations were found between daily out put from Penman– Monteith model and different climatic parameters (Evaporation, Wind speed, Air Temperature, Relative Humidity, Net Radiation and Relative Radiation).