Abstract:

Among many methods of evapotranspiration （ET） estimation, surface energy balance system （SEBS） is one of the widely used methods in recent years. Based on the land surface energy balance theory, SEBS is applied to estimate land surface turbulent flux and the relative evapotranspiration at different scales using visible light,near and far infrared satellite remote sensing data, the insitu meteorological data or the product of atmospheric numerical model.Combining with hydrological data and remote sensing data, this paper estimated the regional evapotranspiration of the Zhangye basin using SEBS, and verified the accuracy of evapotranspiration result based on the principle of hydrological budget. The result indicates that the evapotranspiration by SEBS is consistent with that by hydrological budget method, which verified the accuracy of SEBS in basin evapotranspiration estimation.

Key words: evapotranspiration, SEBS, hydrological budget, Zhangye basin