International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 6, June 2017

International Journal of Science and Technology


Comparisons of Measured and Empirical Potential Evapotranspiration in Ilorin, Nigeria

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Author AHANEKU, I.E.
On Pages 115-120
Volume No. 1
Issue No. 3
Issue Date September 01, 2011
Publishing Date September 01, 2011
Keywords Soil water balance, evapotranspiration, crop coefficient, models performance


Abstract

Four potential evapotranspiration (PET) prediction models were assessed for their for reliability in relation to actual evapotranspiration (ET) obtained from the soil water balance equation. The models tested were the modified Penman, Thornthwaite, Turc and Blaney-Morin-Nigeria (BMN). Using the crop coefficient (Kc) of the reference crop as the conversion factor, the actual ET computed from the soil water balance equation was transformed to its potential equivalent (ETs) which was used as the standard of comparison for evaluating the other four ET models. Good correlation was found between the ET values computed by both the modified Penman and the Thornthwaite in relation to ETs. Performance statistics showed that both the modified Penman and Thornthwaite models yielded similar results, followed by BMN and the Turc models in descending order. However, the Thornthwaite model with correction factors is recommended for the region because of the relative ease of data generation associated with its computation. 

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2010 IRPN Publishers