Regional probability distribution of the annual reference evapotranspiration and its effective parameters in Iran

The reference evapotranspiration (ET 0 ) plays an important role in water management plans in arid or semi-arid countries such as Iran. For this reason, the regional analysis of this parameter is important. But, ET 0 process is affected by several meteorological parameters such as wind speed, solar...

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Bibliographic Details
Published in:Theoretical and applied climatology 2018-10, Vol.134 (1-2), p.411-422
Main Authors: Khanmohammadi, Neda, Rezaie, Hossein, Montaseri, Majid, Behmanesh, Javad
Format: Article
Language:English
Subjects:
Annual
Aquatic Pollution
Arid regions
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Climate science
Climatology
Correlation coefficient
Correlation coefficients
Distribution
Distribution (Probability theory)
Earth and Environmental Science
Earth Sciences
Evapotranspiration
Meteorological parameters
Methods
Original Paper
Parameters
Probability distribution
Probability theory
Regional analysis
Regional planning
Relative humidity
Solar radiation
Temperature effects
Test procedures
Waste Water Technology
Water Management
Water Pollution Control
Wind speed
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Summary:The reference evapotranspiration (ET 0 ) plays an important role in water management plans in arid or semi-arid countries such as Iran. For this reason, the regional analysis of this parameter is important. But, ET 0 process is affected by several meteorological parameters such as wind speed, solar radiation, temperature and relative humidity. Therefore, the effect of distribution type of effective meteorological variables on ET 0 distribution was analyzed. For this purpose, the regional probability distribution of the annual ET 0 and its effective parameters were selected. Used data in this research was recorded data at 30 synoptic stations of Iran during 1960–2014. Using the probability plot correlation coefficient (PPCC) test and the L-moment method, five common distributions were compared and the best distribution was selected. The results of PPCC test and L-moment diagram indicated that the Pearson type III distribution was the best probability distribution for fitting annual ET 0 and its four effective parameters. The results of RMSE showed that the ability of the PPCC test and L-moment method for regional analysis of reference evapotranspiration and its effective parameters was similar. The results also showed that the distribution type of the parameters which affected ET 0 values can affect the distribution of reference evapotranspiration.
ISSN:0177-798X
1434-4483
DOI:10.1007/s00704-017-2283-6