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2 . inst R n G R n inst (wm - ) (wm - ) G (wm - ) wm - R n Surface Energy Balance Algorithm for Land

3 (R s ) (R s ) (R l ) (R l ) a k R n 4 4 ( 1 ) R a T s a s Ts T a G T s NDVI G/R n G Ts R ( n 273 )( )(1 0.98NDVI 4 ) dt J/kg/K C r C p p ah dt kg/m s/m r ah K

4 m/s g k L m/s 3 u Ts kg u * L> L< L inst inst 3600 J/kg r r rf rf rf inst r r- rf rf 24 r 24

5 NDVI r r

6 K NDVI

7 RS GIS Allen, R., Waters, R., Tasumi, M., Trezza, R., Bastiaanssen, W.. SEBAL, Surface energy balance algorithms for land, Idaho Implementation. Advanced Training and Users Manual, version. Almhab, A. and Busu, I.. Estimation of evapotranspiration with modified SEBAL model using Landsat-TM and NOAA-AVRR images in aride mountains area. Second Asia International Conference on Modelling & Simulation. Bastiaanssen, W.G.M., Menenti, M., Feddes, R.A. and oltslang, A.A.. A remote senesing surface energy balance algorithm for land (SEBAL):. Formulation. Journal of ydrology, - : -. Bastiaanssen, W.G.M., Noordman, E.J.M., Pelgrum,., Davids, G., Thoreson, B. P. and Allen, R.G.. SEBAL model with remotely sensed data to improve water-resources management under actual field condition. Journal of Irrigation and Drainage Engineering, ( ): -. afeez, M.M., Chemin, Y., Van De Giesen, N. and Bouman, B.A.M.. Symposium on Geospatial Theory, Processing and Application. Ottawa. Shu, Y., Lei, Y., Zheng, L. and Li,.. An evapotranspiration () model based GIS using LANDSAT data and MODIS data with improved resolution. Journal of Remote Sensing for Environmental Monitoring, GIS Application, and Geology VI,. Singh, R.K., Irmak, A. Irmak, S. and Martin, D.L.. Application of SEBAL model for mapping evapotranspiration and estimating surface energy fluxes in South-Central Nebraska. Journal of Irrigation and Drainage Engineering, ( ): -. Estimation of Evapotranspiration with SEBAL model using MODIS images in regional scale Samira Noori, osein Sanaei-Nejad, Majid asheminia M.Sc. Student of Agrometeorology, Department of water engineering, Ferdowsi University of Mashhad, I.R of Iran; Noori.samira@gmail.com Associate professor in Dept. of Water Engineering, Ferdwosi University of Mashhad, I.R of Iran; sanaein@gmail.com

8 Lecturer in Dept. of Water Engineering, Ferdwosi University of Mashhad, I.R of Iran; Abstract Most of area in Iran country has been located in arid and semi arid regions and water resource management in this regions has been important problem for ever so the estimation of evapotranspiration in regional scale is important. At the recently decades, it is possible to use remote sensing methods. SEBAL is a commoly algorithm for this purpose that it is used in this paper and actual evapotranspiration is estimated in Mashhad s sub basin. In this stydy, it s used MODIS images with daily temporal resolution. By estimating of surface temperature, albedo and vegetation indices, we can calvulate leaf area index, surface emissivity and net radiation and finally it is generated daily evapotranspiration maps in regional scale. The results show actual evapotranspiration can be derived by MODIS satellite and SEBAL model in regional scale. Keywords: Actual evapotranspiration, MODIS, remote sensing, SEBAL