Estimation and Calculation of Actual Evatranspiration Using SEBS Energy Balance Model and Landsat 8 Satellite Imagery (Case study: Bakhtegan-Maharlo Basin)

Document Type : Original Article

Authors

1 Graduated M.Sc. in Water Resources Engineering, Department of Hydrology and water resources Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Hydrology and Water Resources, Faculty of Water and Environmental Engineering, Shahid Chamran University

3 Educator, Department of Remote sensing and GIS, Shahid Chamran University of Ahvaz

Abstract

Using water resources require the determination of components of the hydrological cycle. Understanding of natural systems and physical laws that manage each component of the hydrological cycle is important for the water resources management. One of the crucial components of the hydrological cycle is evapotranspiration. Most methods that have been presented in this study use point measurements to estimate evapotranspiration. Due to dynamic and changing nature of regional evapotranspiration is not generalizable to the basin, the applied methods are only suitable for the local areas. Technology of satellite remote sensing and remote sensing-based methods can be used for the temporal and spatial estimation of actual evapotranspiration in the small and large basins. Remote sensing data derived from satellite imagery calculates the amount of actual evapotranspiration using surface energy balances model. In this study, actual evapotranspiration at the Bakhtegan-Maharloo basin were estimated and evaluated using Landsat 8 satellite images sensor OLI/TIRS and SEBS energy balance models. The values of evapotranspiration derived from energy balance model and FAO-Penman-Monteith method were compared.The results showed that the evapotranspiration values obtained from the energy balance model has a root mean square error (RMSE) and mean absolute difference (MAD) equal to 0.62 and 0.49 mm/d, respectively, indicating its acceptable performance to estimate the evapotranspiration

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