Title: Estimation of Annual Change of Actual Catchment Area Evapotranspiration Using Complementary Relationship Equation
Abstract:The purpose of this study is to estimate the annual changes of monthly evapotranspiration (ET) in a river basin by using Landsat TM data, complementary relationship equation, and digital terrain model...The purpose of this study is to estimate the annual changes of monthly evapotranspiration (ET) in a river basin by using Landsat TM data, complementary relationship equation, and digital terrain model (DTM). This method was applied to the Tokoro River basin and the composited basin, which is consisted of the Bibi, Shukubai and Toasa River basin, in Hokkaido. It was shown that Brutsaert-Stricker equation was the most suitable among the complementary relationship equations for the estimation of ET, by comparing with the residual in annual mean water balance of Tokoro river basin. Net radiation contribute to the formation of basic annual variation of ET and advection term increase the ET in winter in above two study basins.Read More