Application of mountain SEBAl and MODIS imagery for estimation of catchment actual evapotranspiration (case study: Tuyserkan catchment، Hamedan, Iran)

Reduction of surface and ground water resources in country¡ have been caused environmental and ecological hazardsin catchments.Inadequate of water resources affected not only agriculture and natural resources but also society and economic of thecatchments. In such a condition appropriate of water resources management is important and asactual evapotranspiration is the main way ofwasting water in catchments, there for this research¡has focused on evaluation and estimation of actual evapotranspiration in Tuyserkan catchment was investigated.Therefore was used 27 MODIS images¡ 3 LANDSAT images and remote sensing technique was employed to estimated actual evapotranspiration in Tuyserkan catchment. Actual evapotranspiration maps yielded by mountain SEBAL algorithm was comparednational water requirement document. Finally mapsproduced by Modis images wasdownscaled and control using Ladnsat images. Result showed thatmountain SEBALalgorithmis able to estimate actual evapotranspiration with accuracy of 82%.