Journal
NEURAL COMPUTING & APPLICATIONS
Volume 31, Issue 10, Pages 5843-5855Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00521-018-3410-8
Keywords
Evapotranspiration; Gene expression programming; Linear regression; Penman-Monteith
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Funding
- Deanship of Scientific Research, King Saud University, and Agriculture Research Center, College of Food and Agriculture Sciences
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In this study, reference evapotranspiration (ETo) is modeled as one of the major items of hydrological applications from different combinations of climatic variables using two different techniques: gene expression programming (GEP) and multiple linear regression (MLR). The data used in modeling were collected from weather stations in Egypt through the CLIMWAT database. The Penman-Monteith FAO-56 equation was considered as a reference target for ETo values depending on the entire climatic variables. The developed ETo models' performances were compared and evaluated with regard to their predictive abilities using statistical criteria to identify the superiority of one modeling approach over the others and determine climatic variables which have a significant effect on ETo. The results indicated that GEP and MLR models' contribution toward mean relative humidity and wind speed at 2 m height is greater compared to that of other variables. Meanwhile, when adding temperature data to models, solar radiation has a slight effect on increasing the accuracy of ETo estimate. Moreover, the lower statistical error criteria values of GEP models confirmed their better performance than MLR models and other empirical equations.
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