Abstract
Estimation of Evapotranspiration is important for determining the agro-climatic potential of a particular region, water requirement of field crops, irrigation scheduling and suitability of crops or varieties, which can be grown successfully with the best economic returns and therefore numerous models have been developed for determining evapotranspiration. The performance evaluation of commonly used reference evapotranspiration (ET0) estimation methods like FAO 56 Penman-Monteith, Samani and Hargreaves, Makkink, Blaney Criddle, Jensen-Haise, Priestly-Taylor, FAO 24 radiation and Modified Penman Monteith method based on their accuracy of estimation has been undertaken in this study. The inter-relationship between FAO-56 Penman-Monteith method and other reference evapotranspiration (ET0) estimation method is also determined in this study. The results showed that Blaney Criddle method, Modified Penman method, Jensen-Haise method and Priestly-Taylor method are the alternative methods to Penman-Monteith method for better estimate of ET0 for the Junagadh city of Gujarat, India.
Highlights
Evapotranspiration is one of the important phases of hydrologic cycle and its accurate estimation is of paramount importance for water balance studies, irrigation system design, crop yield simulation and water resources planning and management
The present study focused to the performance evaluation of commonly used ET0 estimation methods based on their accuracy of estimation and development of interrelationships between the Penman-Monteith and the other climatological methods
Evapotranspiration Estimation Methods The mean monthly ETo values estimated by various methods are compared with those
Summary
Evapotranspiration is one of the important phases of hydrologic cycle and its accurate estimation is of paramount importance for water balance studies, irrigation system design, crop yield simulation and water resources planning and management. FAO 56 Penman-Monteith Method (PMM) The FAO Penman-Monteith method is a physically-based analytical approach derived from the Penman-Monteith equation [5], a combination of the energy balance and mass transfer method, specifying the resistance factors of the reference surface. It defines the reference surface as a hypothetical surface of green grass with an assumed uniform height of 0.12 m, a surface resistance of 70 s m-1 and an albedo of 0.23 under actively growing and adequately watered conditions [1]. The FAO Penman-Monteith method to estimate ETo is derived as: Objectives
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