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Trend analysis of the rainfall erosivity index at different time scales in Iran

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Abstract

The minute study of the magnitude of changeability and the trend of the rainfall erosivity index has not been taken carried out yet in Iran. The present research therefore aimed to analyze the trends of the rainfall erosivity index as an initial step in the study of the consequences of climatic change on soil environments. The trend analyses were done at three time scales, viz., monthly, seasonal and annual, by the Mann–Kendall (M–K) nonparametric statistical test. The study was conducted for 18 synoptic stations distributed throughout Iran with a 23-year (1970–1992) common data period. The results of the application of the M–K test considering the weighted area on a monthly basis showed that all months except August and December had decreasing trends in the rainfall erosivity index for the study period, while only June (p value = 0.06) and November (p value = 0.01) had a significant decreasing trend in the rainfall erosivity index at a confidence level beyond 94 %. According to the results, there was also a small general decreasing trend in the seasonal rainfall erosivity index in all time series, but not all were statistically significant. The result of the M–K test ultimately verified a significant trend in the annual rainfall erosivity index for the entire country with respective p, Kendall’s statistic and Kendall’s tau values of 0.042, −73 and −0.316.

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Acknowledgments

The authors wish to express their gratitude to anonymous reviewers for their helpful and constructive comments and suggestions, which resulted in an improved paper.

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Authors and Affiliations

  1. Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, 46417-76489, Noor, Mazandaran, Islamic Republic of Iran

    Seyed Hamid Reza Sadeghi & Zeinab Hazbavi

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  1. Seyed Hamid Reza Sadeghi
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  2. Zeinab Hazbavi
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Correspondence to Seyed Hamid Reza Sadeghi.

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Sadeghi, S.H.R., Hazbavi, Z. Trend analysis of the rainfall erosivity index at different time scales in Iran. Nat Hazards 77, 383–404 (2015). https://doi.org/10.1007/s11069-015-1607-z

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  • DOI: https://doi.org/10.1007/s11069-015-1607-z

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