Estimation of Evapotranspiration Using Satellite Image Data in Mashhad area

آب و خاک

Article 11, Volume 25, Issue 3, July 2011   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.9641

Authors

S.H. Sanaei-Nejad¹; S. Noori^{* 2}; M. Hashemi nia²

¹Ferdowsi University of Mashhad

²Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad

Abstract

Abstract
Evapotranspiration (ET) determination is a key factor for irrigation scheduling, water balance, irrigation system design and management and crop yields simulation. Therefore many scientists have tried to estimate evapotranspiration in different spatial and temporal scales. Remote sensing is a one of new technique in estimation of ET in regional scales. So, in this study it’s tried to estimate spatial distribution daily actual ET for Mashhad’s sub basin using MODIS image data related to 4th June, 1st July and 26th July 2009 and surface energy balance algorithm for land (SEBAL) taking into account topographic effects. The results showed that MODIS image data and SEBAL method were able to estimate actual daily ET in Mashhad sub-basin properly. Based on the results, areas which had dense vegetation and low temperatures had high ET rates, while in areas with sparse vegetation and high temperatures the ET rate was low.

Keywords: Evapotranspiration, MODIS, Remote sensing, SEBAL