University of Oulu

Hasanzadeh Saray, M., Eslamian, S.S., Klöve, B. et al. Regionalization of potential evapotranspiration using a modified region of influence. Theor Appl Climatol 140, 115–127 (2020).

Regionalization of potential evapotranspiration using a modified region of influence

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Author: Hasanzadeh Saray, Marzieh1,2; Eslamian, Seyed Saeid1; Klöve, Björn2;
Organizations: 1Department of Water Engineering, College of Agriculture, Isfahan University of Technology, Isfahan, 8415683111, Iran
2Water Resources and Environmental Engineering Research Unit, Faculty of Technology, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Springer Nature, 2020
Publish Date: 2020-05-18


This study examined the effect of different attributes on regionalization of potential evapotranspiration (ETp) in Urmia Lake Basin (ULB), Iran, using the region of influence (RoI) framework. Data for the period 1997–2016 from 30 weather stations were selected for the analysis. To achieve similarity between stations, climate, geographical, and statistical attributes were selected. To determine the effect of each attribute, the Shannon entropy weighting method was used. The results showed that attribute weighting had a significant impact on ETp clustering. Among the groups studied, the most significant effect of weighting was observed in the statistical attributes category. Among all attributes, skewness coefficient (CS) was the most useful in determining similarity between stations. Based on the results, ULB can be divided into three homogeneous regions. Proximity of weather stations did not always indicate similarity between them, but by weighting the stations in addition to weighting the attributes, more accurate estimates of ETp in the basin were obtained. Overall, the results demonstrate potential for application of the RoI approach in regionalization of ETp, by assigning a weight to weather stations and to influencing attributes.

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Series: Theoretical and applied climatology
ISSN: 0177-798X
ISSN-E: 1434-4483
ISSN-L: 0177-798X
Volume: 140
Issue: 1-2
Pages: 115 - 127
DOI: 10.1007/s00704-019-03078-2
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
1172 Environmental sciences
Funding: Open access funding provided by University of Oulu including Oulu University Hospital.
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