Reference evapotranspiration prediction using Artificial Neural Networks

Authors

  • Raquel Salazar-Moreno Universidad Autónoma Chapingo, Posgrado en Ingeniería Agrícola y Uso Integral del Agua, carretera México-Texcoco km 38.5, Chapingo, Estado de México, México, C. P. 56230. https://orcid.org/0000-0001-6429-3824
  • Irineo Lorenzo López-Cruz Universidad Autónoma Chapingo, Posgrado en Ingeniería Agrícola y Uso Integral del Agua, carretera México-Texcoco km 38.5, Chapingo, Estado de México, México, C. P. 56230.
  • Efrén Fitz-Rodríguez Universidad Autónoma Chapingo, Posgrado en Ingeniería Agrícola y Uso Integral del Agua, carretera México-Texcoco km 38.5, Chapingo, Estado de México, México, C. P. 56230.

DOI:

https://doi.org/10.29059/cienciauat.v17i2.1708

Keywords:

neural networks, evapotranspiration, FFNN, ERNN, NARX

Abstract

Reference evapotranspiration (ETo) is a hydrological variable of great importance in irrigation management. Its estimation is carried out with the Penman-Montieth (PM) equation that requires many meteorological variables and that are sometimes not available. Since ETo is a nonlinear and complex variable, in recent years alternative methods have emerged for its estimation, such as artificial neural networks (ANN). The objective of this work was to estimate the reference evapotranspiration (ETo) using the Penman-Montieth equation, in order to develop artificial neural network (ANN) models that allow ETo to be predicted in regions with limited climatological information, and in turn to compare the performance of three RNA models: FFNN, ERNN and NARX. Daily informtion was used during the January 1, 2007 to December 31, 2018 period, for the ENP8 and ENP4 meteorological stations in Mexico city. Based on the correlation analysis and the Garson sensitivity analysis, 2 cases were studied for the 3 ANN models: 1) ANN with 6 inputs: solar radiation (Rad), maximum and minimum temperature (Tmax, Tmin), maximum and minimum relative humidity (RHmax, RHmin), and wind speed (u), and 2) RNA with 2 inputs (Rad and Tmax). The output variable was the ETo, calculated with the PM equation. In all cases, the performance of the 3 ANNs was very similar. The most notable difference is that the dynamic networks (ERNN and NARX) require fewer iterations to achieve the optimum performance. ANNs trained only with radiation and maximum temperature as inputs were able to predict a long-term ETo for 440 at another nearby meteorological station (ENP4), with efficiencies greater than 90 %.

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Published

2023-01-31

How to Cite

Salazar-Moreno, R. ., López-Cruz, I. L., & Fitz-Rodríguez, E. (2023). Reference evapotranspiration prediction using Artificial Neural Networks. CienciaUAT, 17(2), 181-196. https://doi.org/10.29059/cienciauat.v17i2.1708

Issue

Section

Biotechnology and Agricultural Sciences