MODIFICATION OF STANDARDIZED PRECIPITATION INDEX (SPI) BASED ON RELEVANT PROBABILITY DISTRIBUTION FUNCTION

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MOSAEDI A.; GHABAEI SOUGH M.

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Journal: Journal of Water and Soil Year:2012 | Volume:25 | Issue:5 Page(s): 1206-1216

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Information Journal Paper

Title

MODIFICATION OF STANDARDIZED PRECIPITATION INDEX (SPI) BASED ON RELEVANT PROBABILITY DISTRIBUTION FUNCTION

Author(s)

MOSAEDI A. | GHABAEI SOUGH M. | Issue Writer Certificate

Keywords

STANDARDIZED PRECIPITATION INDEX (SPI)Q2

GAMMA DISTRIBUTIONQ3

EQUI-PROBABILITY TRANSFORMATIONQ3

DISPLACEMENT OF DIFFERENT CLASSESQ2

IRANQ2

Abstract

SPI is based on fitting a GAMMA DISTRIBUTION to precipitation amounts in selected periods. Based on current research, the GAMMA DISTRIBUTION may not be fitted to annual precipitation of some regions. In order to evaluate this subject, annual precipitation have been used during 1958- 2007 at 11 Synoptic Stations in IRAN. In first step, values of SPI and frequency of different classes of drought severity were calculated. The Kolmogorov–Smirnov test is used to assess the goodness of fitting most appropriate distribution function to annual precipitation. Then, according to EQUI-PROBABILITY TRANSFORMATION the values of SPI were modified. The impact of applying most appropriate distribution function was evaluated to change the frequency of different classes of drought severity in Modified Standardized Precipitation Index (MSPI). The results showed that annual precipitation in all stations do not fallow GAMMA DISTRIBUTION as appropriate distribution function except for Rasht station. Using appropriate distribution function in a MSPI leads to changing the frequency and/or DISPLACEMENT OF DIFFERENT CLASSES in SPI. So displacements occurred in all classes of drought severity at Tehran and Gorgan synoptic stations. The Gorgan station with 15 events has the most changes in frequency classes.

Cites

DESIGN PROCESS OF SELECTING APPROPRIATE DROUGHT INDEX BASED ON MONITORING MULTIVARIATE METEORS IN SOME STATIONS OF ARID AND SEMI-ARID REGIONS, IRAN

References

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APA: Copy

MOSAEDI, A., & GHABAEI SOUGH, M.. (2012). MODIFICATION OF STANDARDIZED PRECIPITATION INDEX (SPI) BASED ON RELEVANT PROBABILITY DISTRIBUTION FUNCTION. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), 25(5), 1206-1216. SID. https://sid.ir/paper/141273/en

Vancouver: Copy

MOSAEDI A., GHABAEI SOUGH M.. MODIFICATION OF STANDARDIZED PRECIPITATION INDEX (SPI) BASED ON RELEVANT PROBABILITY DISTRIBUTION FUNCTION. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)[Internet]. 2012;25(5):1206-1216. Available from: https://sid.ir/paper/141273/en

IEEE: Copy

A. MOSAEDI, and M. GHABAEI SOUGH, “MODIFICATION OF STANDARDIZED PRECIPITATION INDEX (SPI) BASED ON RELEVANT PROBABILITY DISTRIBUTION FUNCTION,” JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), vol. 25, no. 5, pp. 1206–1216, 2012, [Online]. Available: https://sid.ir/paper/141273/en

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