نوع مقاله : مقاله پژوهشی
1 استاد/ گروه مهندسی آب، دانشگاه رازی، کرمانشاه، ایران.
2 دانشجوی دکتری، گروه مهندسی آب، دانشگاه رازی، کرمانشاه، ایران
3 کارشناسی ارشد/ گروه مهندسی آب، دانشگاه رازی، کرمانشاه، ایران
عنوان مقاله [English]
Now a days, one of the interest algorithms for many of researchers to estimate evaporation - transpiration and crop coefficients by satellite images is Sebal model. In this study, the ability of the Sebal model for corn actual evapotranspiration and crop coefficient determination in Sarab Nilufar Plain located in Kermanshah Province was evaluated. For this purpose, in this study, satellite Landsat 8 images processing in three days as: 07.22.2014, 08.07.2014 and 08.23.2014 were used respectively. Actual–evapotranspiration was calculated by using of satellite images based on the surface energy balance equation (SEBAL model) and meteorological required data. Moreover, the potential evapotranspiration was computed for corn using Penman-Montieth method and then by using of calculated data from Sebal method, the crop coefficient values were determined for the above mentioned days. Finally, the evapotranspiration values by the SEBAL model (predicted values) for corn were computed as 7.11, 6.9 and 5.16 mm/day and crop coefficients values were obtained as 1.09, 1.33 and 0.87 respectively