Estimating Evapotranspiration Using Artificial Neural Network and Minimum Climatological Data
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Volume 133, Issue 2
Abstract
The objective of this study was to test an artificial neural network (ANN) for estimating the reference evapotranspiration (ETo) as a function of the maximum and minimum air temperatures in the Campos dos Goytacazes county, State of Rio de Janeiro. The data used in the network training were obtained from a historical series (September 1996 to August 2002) of daily climatic data collected in Campos dos Goytacazes county. When testing the artificial neural network, two historical series were used (September 2002 to August 2003) relative to Campos dos Goytacazes, and Viçosa, State of Minas Gerais. The ANNs (multilayer perceptron type) were trained to estimate ETo as a function of the maximum and minimum air temperatures, extraterrestrial radiation, and the daylight hours; and the last two were previously calculated as a function of either the local latitude or the Julian date. According to the results obtained in this ANN testing phase, it is concluded that when taking into account just the maximum and minimum air temperatures, it is possible to estimate ETo in Campos dos Goytacazes.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 133 • Issue 2 • April 2007
Pages: 83 - 89
Copyright
© 2007 ASCE.
History
Received: Mar 11, 2005
Accepted: Jun 1, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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