Performance of radiation-based reference evapotranspiration equation developed for Indian sub-humid conditions

Authors

  • ARVIND SINGH TOMAR Department of Irrigation & Drainage Engineering, College of Technology, G. B. Pant University of Agriculture & Technology, Pantnagar 263145 Uttarakhand, India

DOI:

https://doi.org/10.54386/jam.v18i1.905

Keywords:

Radiation-based equation, reference evapotranspiration, sub-humid, Hazaribagh,, Pantnagar

Abstract

In this study, asite-specific radiation based equation for estimating reference evapotranspiration (ETo) was developed and its performance was statistically analysed in comparison to widely accepted FAO Penman-Monteith (FAO-56 PM) model and four radiation-based ETo methods for sub-humid Hazaribagh region of Jharkhand state. The equation was developed with daily values of incoming solar radiation in conjunction with air temperature (minimum and maximum) by considering daily FAO-56 PM ET0 values as index with weather dataset of 15 years (1990-2004). The performance of developed equation validated with eight years (2005-2012) daily weather dataset revealed that it estimated ETo values better than other radiation-based methods. The respective higher and lower values of agreement index and root mean square error with FAO-56 PM ET0 values during validation period confirms efficacy of developed equation whose performance tested at another Indian sub-humid location (Pantnagar) confirmed its suitability as well. Considering the limitations associated with reliability and availability of weather data especially in developing countries, developed equation is recommended as practical one to estimate ETo in sub-humid climatic conditions if FAO-56 PM model cannot be used due to non-availability of required weather parameters at a location.

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Published

01-06-2016

How to Cite

ARVIND SINGH TOMAR. (2016). Performance of radiation-based reference evapotranspiration equation developed for Indian sub-humid conditions. Journal of Agrometeorology, 18(1), 76–82. https://doi.org/10.54386/jam.v18i1.905

Issue

Vol. 18 No. 1 (2016): June

Section

Research Paper

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