INVESTIGATING THE EFFECT OF DISTRIBUTION FUNCTION AND POTENTIAL EVAPOTRANSPIRATION ASSESSMENT METHOD IN DETERMINING RECONNAISSANCE DROUGHT INDEX

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REZAIE H.; KHANMOHAMMADI N.; MONTASERI M.; BEHMANESH J.

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Paper Information

Journal: Journal of Irrigation Sciences and Engineering Year:2017 | Volume:40 | Issue:SUPPLEMENT 1/1 Page(s): 167-183

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Title

INVESTIGATING THE EFFECT OF DISTRIBUTION FUNCTION AND POTENTIAL EVAPOTRANSPIRATION ASSESSMENT METHOD IN DETERMINING RECONNAISSANCE DROUGHT INDEX

Author(s)

REZAIE H. | KHANMOHAMMADI N. | MONTASERI M. | BEHMANESH J. | Issue Writer Certificate

Keywords

RECONNAISSANCE DROUGHT INDEXQ1

EVAPOTRANSPIRATIONQ1

LOG-NORMAL DISTRIBUTIONQ1

DROUGHTQ2

Abstract

Iran is located in arid and semi-arid regions in the world and therefore, DROUGHT monitoring has an important role in there. DROUGHT assessment is conventionally based on DROUGHT indices such as DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX (RDI). On the basis of definition, DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX is estimated by fitting LOG-NORMAL DISTRIBUTION on the ratio of precipitation to potential EVAPOTRANSPIRATION (calculated by Thornthwaite method). In this research, the effect of the change of distribution function and potential EVAPOTRANSPIRATION calculation method was investigated in estimating DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX in Iran. For this purpose, meteorological data of 30 synoptic stations were used in the period of 1960-2014. The potential EVAPOTRANSPIRATION was calculated using the FAO Penman-Monteith as standard method. Beside standard method, 20 different methods were used to calculate EVAPOTRANSPIRATION value. The superior EVAPOTRANSPIRATION calculating method was obtained using Root Mean Square Error statistic. Then, the DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX values were calculated using different EVAPOTRANSPIRATION values and by fitting several probability distribution functions. On the basis of obtained results, the change of probability distribution function and EVAPOTRANSPIRATION calculation method can affect the determining DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX. Also, the comparison results of the calculated DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX based on the fitting the superior probability distribution function on the ratio of precipitation to potential EVAPOTRANSPIRATION which was calculated using superior and standard methods showed that the FAO Penman-Monteith method should be used in 90% of the studied stations to calculate DROUGHT INDEX/fa?page=1&sort=1&ftyp=all&fgrp=all&fyrs=all" target="_blank">RECONNAISSANCE DROUGHT INDEX in cases of data available.

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APA: Copy

REZAIE, H., KHANMOHAMMADI, N., MONTASERI, M., & BEHMANESH, J.. (2017). INVESTIGATING THE EFFECT OF DISTRIBUTION FUNCTION AND POTENTIAL EVAPOTRANSPIRATION ASSESSMENT METHOD IN DETERMINING RECONNAISSANCE DROUGHT INDEX. IRRIGATION SCIENCES AND ENGINEERING (JISE) (SCIENTIFIC JOURNAL OF AGRICULTURE), 40(SUPPLEMENT 1/1 ), 167-183. SID. https://sid.ir/paper/216924/en

Vancouver: Copy

REZAIE H., KHANMOHAMMADI N., MONTASERI M., BEHMANESH J.. INVESTIGATING THE EFFECT OF DISTRIBUTION FUNCTION AND POTENTIAL EVAPOTRANSPIRATION ASSESSMENT METHOD IN DETERMINING RECONNAISSANCE DROUGHT INDEX. IRRIGATION SCIENCES AND ENGINEERING (JISE) (SCIENTIFIC JOURNAL OF AGRICULTURE)[Internet]. 2017;40(SUPPLEMENT 1/1 ):167-183. Available from: https://sid.ir/paper/216924/en

IEEE: Copy

H. REZAIE, N. KHANMOHAMMADI, M. MONTASERI, and J. BEHMANESH, “INVESTIGATING THE EFFECT OF DISTRIBUTION FUNCTION AND POTENTIAL EVAPOTRANSPIRATION ASSESSMENT METHOD IN DETERMINING RECONNAISSANCE DROUGHT INDEX,” IRRIGATION SCIENCES AND ENGINEERING (JISE) (SCIENTIFIC JOURNAL OF AGRICULTURE), vol. 40, no. SUPPLEMENT 1/1 , pp. 167–183, 2017, [Online]. Available: https://sid.ir/paper/216924/en

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