Derivation of regression models for pan evaporation estimation

Document Type : Research Paper

Authors

1 university of Tabriz, water resources management, Tabriz. IRAN

2 Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Iran

Abstract

Evaporation is an essential component of hydrological cycle. Several meteorological
factors play role in the amount of pan evaporation. These factors are often related to each
other. In this study, a multiple linear regression (MLR) in conjunction with Principal
Component Analysis (PCA) was used for modeling of pan evaporation. After the
standardization of the variables, independent components were obtained using the (PCA).
The series of principal component scores were used as input in multiple linear regression
models. This method was applied to four stations in East Azerbaijan Province in the North
West of Iran. Mathematical models of pan evaporation were derived for each station. The
results showed that the first three components in all four stations account for more than
90% of the data variance. Performance criteria, namely coefficient of determination (R2)
and root mean square error (RMSE), were calculated for models in each station. The results
showed that in all the PCA-MLR models, the R2 value was greater than 0.74 (significant at
the 5% level) and the RMSE was less than 0.52 mm per day. In general, the results showed
an improvement in the results using combination of PCA and MLR models for pan
evaporation estimation.

Keywords

Main Subjects

References

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Environmental Resources Research
Volume 7, Issue 1
July 2019
Pages 29-42

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