Estimation of Evapotranspiration in Thamirabarani River Basin using Remote Sensing Parameter

Evapotranspiration is an important component of the hydrological cycle and its accurate quantification is crucial for the design, operation and management of irrigation systems. At present, the evapotranspiration was calculated as a point data and get interpolated to the nearby location, this interpolation fails to give correct result. Therefore, satellite images are used to estimate the evapotranspiration which provide the value for each and every pixel which can be monitor using the Landsat and MODIS data. In these study attempt was made to estimate evapotranspiration using remote sensing parameters. Three temperature based evapotranspiration are evaluated, which is a particularly important region from the environmental conservation point of view. The thornwaithe and Blaneye Criddle are the tested methods, only when air temperature data are available. One weather station with complete climate datasets is used to calibrate the selected model using the Penmane Monteith method as a reference and the results are validated using these reference method. The results indicate that the Thornwaithe model is the most appropriate for this particular study area, with appropriate results compare to the reference method.