هادی اکبرزاده مقدم سه قلعه

Obviously, in any planning for qualitative and quantitative management of water resources, ýestimating the water balance and values of the input and output components that will play an ýimportant role. Several studies in the field of evapotranspiration most complex component of ýthe water balance in the world and many models offered and developedþ.þý Remote Sensing due to ýthe superiority of meteorological methods based on measuring point and water balance is more ýin the works. In this study, performance of Surface Energy Balance (SEBS) model to estimate ýactual evapotranspiration in Sistan plain is studied. For this purpose data from Zehak ýmeteorological stations and the technology of remote sensing and MODIS sensor images used. ýSurface flux of energy balance is calculated for each image pixel and actual evapotranspiration ýwere estimated by the remaining amount of the energy balance at the level. The results were ýcompared with results of two point ground-based data consist of the hay grown on the sidelines ýof Zahak synoptic station and water level of reservoir of Chahnime1. Model showed good ýperformance for both land and water based on correlation coefficient value with 0.78 and 0.89 ýrespectively.ý

Freshwater lakes are considered one of limited water resources that in recent decades are faced with many problems of quality and quantity. Proper management of these resources requires accurate information of component of the water budget. Evaporation as most unknown term of water budget, have a large share of water losses. To have precise information on the spatial and temporal distribution contribute to principles of qualitative and quantitative planning at water resources. Chanimeh’s artificial reservoirs are located in the east part of the country, with an area 141 Km2 was selected as case study. In this research, evaporation rate were estimated by SEBAL model and using meteorological data and satellite images of MODIS. Pan method applied in the region was used as reference method. As a result, the mapping of evaporation by 25*250 m spatial resolution was obtained. In point compare SEBAL model results with pan observed amount, the model correlation coefficient R, 0.74 and the error average percentage, ±14.5 and RMSD is equal to 2.95 mm. The mean latent heat flux and evaporation in average daily rate for the 202th of Julian days of 2012 year from water surface are equal 308 W/m2 and 13 mm per day, respectively.