THE IMPACT OF THE NUMBER OF ADJOINING WET DAYS ON THE DISTRIBUTION OF RAINFALL AMOUNTS

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ABABAEI BEHNAM; SOHRABI TEYMOUR; MIRZAEI FARHAD

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Journal: Journal of Irrigation Sciences and Engineering Year:2011 | Volume:34 | Issue:1 Page(s): 25-34

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Title

THE IMPACT OF THE NUMBER OF ADJOINING WET DAYS ON THE DISTRIBUTION OF RAINFALL AMOUNTS

Author(s)

ABABAEI BEHNAM | SOHRABI TEYMOUR | MIRZAEI FARHAD | Issue Writer Certificate

Keywords

RAINFALL CLASSESQ2

RAINFALL AMOUNTS DISTRIBUTIONQ2

ADJOINING WET DAYSQ2

LOG LIKELIHOOD RATIO TESTQ2

Abstract

The amount of daily rainfall for a solitary wet day (Class 0) is normally less than the rainfall for a wet day that is enclosed by wet days on either side (Class 2). The same characteristics hold true for the case of the first or last day of wet spells (Class 1) and there fore the rainfall here is found to be smaller than the Class 2 rainfall. In many regions, there exist large differences between these RAINFALL CLASSES. In this study, the daily rainfall data from 5 rain gauge stations in the north and northwest of Iran are classified to classes 0, 1 and 2 according to the number of ADJOINING WET DAYS. To examine the impact of ADJOINING WET DAYS on the distribution of rainfall amounts, different distributions were tested with 3 different data sets: (1) all RAINFALL CLASSES grouped together, (2) solitary wet days fitted separately from other wet days, and finally (3) all RAINFALL CLASSES separately. The results showed that the models which treat the RAINFALL CLASSES separately are a better fit for all the 5 stations. The Akaike Information Criterion (AIC) values are significantly reduced as the rainfall data are split into RAINFALL CLASSES. Also, among 4 different distributions considered (Gamma, Lognormal, Mixed Exponential and Weibul), mixed exponential distribution in most cases and lognormal distribution in one case showed better performances.

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APA: Copy

ABABAEI, BEHNAM, SOHRABI, TEYMOUR, & MIRZAEI, FARHAD. (2011). THE IMPACT OF THE NUMBER OF ADJOINING WET DAYS ON THE DISTRIBUTION OF RAINFALL AMOUNTS. IRRIGATION SCIENCES AND ENGINEERING (JISE) (SCIENTIFIC JOURNAL OF AGRICULTURE), 34(1), 25-34. SID. https://sid.ir/paper/217257/en

Vancouver: Copy

ABABAEI BEHNAM, SOHRABI TEYMOUR, MIRZAEI FARHAD. THE IMPACT OF THE NUMBER OF ADJOINING WET DAYS ON THE DISTRIBUTION OF RAINFALL AMOUNTS. IRRIGATION SCIENCES AND ENGINEERING (JISE) (SCIENTIFIC JOURNAL OF AGRICULTURE)[Internet]. 2011;34(1):25-34. Available from: https://sid.ir/paper/217257/en

IEEE: Copy

BEHNAM ABABAEI, TEYMOUR SOHRABI, and FARHAD MIRZAEI, “THE IMPACT OF THE NUMBER OF ADJOINING WET DAYS ON THE DISTRIBUTION OF RAINFALL AMOUNTS,” IRRIGATION SCIENCES AND ENGINEERING (JISE) (SCIENTIFIC JOURNAL OF AGRICULTURE), vol. 34, no. 1, pp. 25–34, 2011, [Online]. Available: https://sid.ir/paper/217257/en

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