Estimating effective rainfall using remote sensing and SEBAL energy balance algorithm and comparing it with experimental methods (case study: dry wheat cultivation plain of Khomein city).

Document Type : Research Paper


Department of Irrigation & Reclamation Engineering, Faculty of agriculture. College of Agriculture & Natural Resources. University of Tehran, Karaj, Iran


Considering the importance of water in the agricultural sector, it is necessary to know the usable or effective amount. Therefore, in this research, using remote sensing and implementing the Surface Energy Balance Algorithm (SEBAL) on 28 images from Landsat 8 for the crop years 2014 to 2022 in During the growth period of dry wheat in fields of Khomein city, the rate of evapotranspiration and effective rainfall were estimated. The accuracy of SEBAL has been evaluated with Penman-Monteith and pan evaporation methods, and then the results obtained with experimental methods of effective rainfall estimation have been compared and their relative error (RE) has been estimated. The results showed that the USDA method with a RE of 12.2% had the lowest error and the FAO with a RE of 60% had the highest error compared to the SEBAL.


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