Modifying Annual Precipitation Mean Concerning the Effects of Heteroscedasticity in Different Climatic Regions of Iran

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HOLISAZ A.; SAFIKHANI S.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2020 | Volume:15 | Issue:4 Page(s): 171-186

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Title

Modifying Annual Precipitation Mean Concerning the Effects of Heteroscedasticity in Different Climatic Regions of Iran

Author(s)

HOLISAZ A. | SAFIKHANI S. | Issue Writer Certificate

Keywords

HeteroscedasticityQ2

IranQ1

Levene TestQ1

Masoodian Climatic RegionQ1

Precipitation MeanQ1

Abstract

Heteroscedasticity as determining concept challenges the calculation and efficiency of mean precipitation at the extent of Iran territory. This inefficiency leads to emergence of error during calculation of annual water budget and of problem in water resources of country. Accordingly, in this study, building on the Masoodian climatic classification and investigating the precipitation data from146 synoptic stations at four temporal scales-heavy rain, semi-heavy rain, pre-precipitation, and low rain-the effect of Heteroscedasticity on mean precipitation were investigated by Levene Test. The results showed that besides the precipitation data have a normal distribution across all climatic regions, but the existence of limiting precipitations as outliers data, very high-variances and the variation of precipitation regimes from some station of a climatic region, resulted in rejection of null hypothesis of Levene Test and most of climatic regions are encountered Heteroscedasticity. Consequently, use of mean index could not provide complete recognition of precipitation status and precipitation distribution. Hence, to achieve an efficient mean of annual precipitation in country, it is necessary to do practice to enhance the calculated mean precipitation in climatic extent, with avoiding calculating mean at territory extent, and by accomplishment of improved climatic classification at watershed basin scale, gains better recognition of precipitation behavior at any climatic extent, and at whole territory extent in Iran.

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APA: Copy

HOLISAZ, A., & SAFIKHANI, S.. (2020). Modifying Annual Precipitation Mean Concerning the Effects of Heteroscedasticity in Different Climatic Regions of Iran. IRAN-WATER RESOURCES RESEARCH, 15(4 ), 171-186. SID. https://sid.ir/paper/99988/en

Vancouver: Copy

HOLISAZ A., SAFIKHANI S.. Modifying Annual Precipitation Mean Concerning the Effects of Heteroscedasticity in Different Climatic Regions of Iran. IRAN-WATER RESOURCES RESEARCH[Internet]. 2020;15(4 ):171-186. Available from: https://sid.ir/paper/99988/en

IEEE: Copy

A. HOLISAZ, and S. SAFIKHANI, “Modifying Annual Precipitation Mean Concerning the Effects of Heteroscedasticity in Different Climatic Regions of Iran,” IRAN-WATER RESOURCES RESEARCH, vol. 15, no. 4 , pp. 171–186, 2020, [Online]. Available: https://sid.ir/paper/99988/en

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