Indian Journal of Science and Technology

Abstract

In the current research, SEBAL1 method has been used in order to find a quick way with a desirable accuracy for measuring the real evapotranspiration in farming areas of Maiamei rural district in Mashhad. Therefore, satellite images from Landsat and the meteorological information of the region for 29 April 2002 (9 Ordibehesht 1381) were provided and the SEBAL calculations were applied on the images with the help of the software ILWIS. Then the relation between the surface parameters (temperature and the vegetation) with the energy components resulted from this method was studied. By conducting research on the treatment of this method on different vegetations, it was concluded that the regions with a wider range of vegetation and a more various density, had less evapotranspiration while by reducing the range and increasing the density of vegetation in this area, the amount of evapotranspiration experiences a stepped rise. Also, the results of this research showed that there is a linear relation with a high accuracy (R2 = 0.96) between the surface temperature and the instantaneous latent heat flux which could be used to reduce the calculation steps of SEBAL model for the studied area and calculate the amount of evapotranspiration in a quicker and easier way by using a modified model.
Keywords: Energy Components, Evapotranspiration, Satellite Imagery, Surface Temperature, Vegetation