Development and Application of Annual Evapotranspiration Estimation Model Considering Vegetation Effect

The hydrologic response of watershed determined by complex process about climate-soil-vegetation. Evapotranspiration is very important component of hydrological cycle to connect climate, soil and vegetation. The research of annual evapotranspiration the watershed is primary topic for understanding hydrological cycle in watershed. A suitable model for South Korea which relates annual evapotranspiration to precipitation, potential evapotranspiration, and ratio of forest considering vegetation effect, is proposed in this study. Result of the proposed model is not high quality about estimating evapotranspiration but it is better than previous model which relates annual evapotranspiration. This study is able to suggest research direction about dynamic analysis of climate-soil-vegetation.