COMPARATIVE EVALUATION OF TEMPORAL AND SPATIAL FREQUENCY DISTRIBUTION FOR RAINFALL EROSIVITY IN FEW IRANIAN CLIMATOLOGICAL STATIONS

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SADEGHI H.R.; GHAZANFARPOUR N.

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Journal: Agricultural Sciences and Technology Year:2007 | Volume:21 | Issue:2 (SPECIAL ISSUE IN SOIL, WATER AND AIR) Page(s): 55-66

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Title

COMPARATIVE EVALUATION OF TEMPORAL AND SPATIAL FREQUENCY DISTRIBUTION FOR RAINFALL EROSIVITY IN FEW IRANIAN CLIMATOLOGICAL STATIONS

Author(s)

SADEGHI H.R. | GHAZANFARPOUR N. | Issue Writer Certificate

Keywords

RAINFALL EROSIVITYQ3

STATISTICAL DISTRIBUTIONQ3

TEMPORAL VARIATIONQ2

SPATIAL VARIATIONQ3

CLIMATOLOGICAL STATIONQ3

Abstract

The present study has been conducted to investigate the spatial and TEMPORAL VARIATION of fitted distributions to the erosivity index. In order to detelmine the Erosivity Index proposed by Wischmeier and Smith, kinetic energy was firstly calculated for the study storms and then interacted with the maximum 30 minutes intensity. To achieve the study purposes, six meteorological stations viz.Kassilian, Babolsar, Kashan, Bostan, Booshehr and Gachsaran were selected for a common period of 19 years. The Erosivity Index was then calculated in monthly, seasonal and annual time scales.The different STATISTICAL DISTRIBUTIONs were fitted to the calculated values using SMADA software.The goodness of fit of study distributions was assessed based on RSS in different time scales. The final evaluation was then made with the help of factor scoring and classification of RSS. The results of the study revealed that the best fitted distribution for erosivity index in monthly, seasonal and annual time scales were Log Normal and Gumbel, 3 Parameter Log Normal, Pearson and Gumbel, and Log Pearson, Gumbel and Pearson, respectivly. The results of the study also showed that the spatial distribution of erosivity data significantly affected the type of the distribution fitted to the data calculated for each particular meteorological study station.

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APA: Copy

SADEGHI, H.R., & GHAZANFARPOUR, N.. (2007). COMPARATIVE EVALUATION OF TEMPORAL AND SPATIAL FREQUENCY DISTRIBUTION FOR RAINFALL EROSIVITY IN FEW IRANIAN CLIMATOLOGICAL STATIONS. AGRICULTURAL SCIENCES AND TECHNOLOGY, 21(2 (SPECIAL ISSUE IN SOIL, WATER AND AIR)), 55-66. SID. https://sid.ir/paper/22486/en

Vancouver: Copy

SADEGHI H.R., GHAZANFARPOUR N.. COMPARATIVE EVALUATION OF TEMPORAL AND SPATIAL FREQUENCY DISTRIBUTION FOR RAINFALL EROSIVITY IN FEW IRANIAN CLIMATOLOGICAL STATIONS. AGRICULTURAL SCIENCES AND TECHNOLOGY[Internet]. 2007;21(2 (SPECIAL ISSUE IN SOIL, WATER AND AIR)):55-66. Available from: https://sid.ir/paper/22486/en

IEEE: Copy

H.R. SADEGHI, and N. GHAZANFARPOUR, “COMPARATIVE EVALUATION OF TEMPORAL AND SPATIAL FREQUENCY DISTRIBUTION FOR RAINFALL EROSIVITY IN FEW IRANIAN CLIMATOLOGICAL STATIONS,” AGRICULTURAL SCIENCES AND TECHNOLOGY, vol. 21, no. 2 (SPECIAL ISSUE IN SOIL, WATER AND AIR), pp. 55–66, 2007, [Online]. Available: https://sid.ir/paper/22486/en

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