Analyzing the Trend of Crop Evapotranspirationin the Isfahan City, Case Study:Wheatcrop

Document Type : Original Article

Authors

1 Master Student in Water Engineering, Department of Water Sciences and Engineering, Tehran University., Tehran., Iran

2 PhD. Candidate in Water Engineering, Department of Water Sciences and Engineering, Ferdowsi University of Mashhad., Mashhad., Iran

3 Professor, Khavaran Environmental Research group., Mashhad., Iran

4 Professor, Department of Water Sciences and Engineering, Ferdowsi University of Mashhad., Mashhad., Iran

Abstract

Climate changeisone ofhumanity's today problems andis considered as a threat tothe planetso Identifyandpredictits elements, is very importantfor themanagement of crisis situations. Inthis study thetime variationprocess ofthe evapotranspiration parameterforwheat crop, along withthetemporal changesoftemperaturein Isfahancity, was studied. Therefore,data fromsynopticweatherstationsofthe47-year period(1964-2010) were usedandwith usingparametric, RegressionAnalysis and nonparametric,Mann-Kendall tests, significant formonthly and annualtime seriesof95and99percentsignificancelevelswas evaluated. The resultsshowed thatthetemporal variations ofevapotranspirationof wheathave been declining. The mostsignificantmonthlyevapotranspirationtrendwas observedinJuly andAugust, althoughthere was no significanttrendofincreasing temperature. Based on theannual time series, evapotranspirationshowed a significantdownward trendinthe level of 99percent, with a slopeof about29%, however,thetemperature increasewas not significant. Comparing theresults ofbothevapotranspirationand temperaturechangesby bothtestsindicatethatthisphenomenon ofevaporationparadoxexistedinIsfahancity.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 10, Issue 5 - Serial Number 59
November and December 2016
Pages 674-686

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