ESTIMATION OF EVAPOTRANSPIRATION IN AN EXPERIMENTAL WATERSHED IN A DECIDUOUS FOREST OF SOUTH INDIA

摘要: Forested areas play a dominant role in the global hydrological cycle. Evapotranspiration is component most of time catching up with rainfall. Though there are sophisticated methods which available for its estimation, simple reliable tool needed so that good budgeting could be made. Studies have established evapotranspiration forested much higher than agricultural areas. Latitude, type forests, climate and geological characteristics also add to complexity estimation. Few studies compared different on watersheds semi arid tropical forests. In this paper comparative study estimation made reference actual measurements using all parameter climatological station data small deciduous watershed Mulehole (area 4.5 km2 ), South India. Potential (ETo) was calculated ten physically based empirical methods. Actual evapotranspiration (AET) has been through computation water balance SWAT model. The Penman-Montieth method used as benchmark compare estimates arrived at various The AET shows agreement curve for forests worldwide. Error have respect Penman-Montieth method. This give an idea errors involved whenever limited show use indirect more suitable regional scale studies.