Londhe, DS; Katpatal, YB (2020). Comparative assessment of evapotranspiration in Bhima sub-basin using spatial analysis for normal and ENSO years. JOURNAL OF AGROMETEOROLOGY, 22(2), 179-185.

Evapotranspiration (ET) estimation is important for hydrological modelling and water management for irrigation. The present study estimates the reference evapotranspiration using FAO Penman-Monteith (FAO P-M) method and SWAT hydrological model, and its spatial variation during ENSO events during 1996 to 2013. The spatial variation of crop coefficient and actual evapotranspiration (ETa) is also analyzed. The results from these methods are compared for various El Nino-Southern Oscillation (ENSO) events and normal years. MODIS NDVI data was used to generate crop coefficients which were further used for generation of ETa.The results show that the ET0 estimated using FAO P-M is less during the pre-monsoon period than ET0 estimated using SWAT model. ET(0 )values from FAO P-M show decreasing trends while those by SWAT show increasing trends. Also, ET0 shows higher values during post monsoon period of El Nino years as compared to La Niha and normal years.