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

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• 作者：Seyed Hamid Reza Sadeghi ; Zeinab Hazbavi
• 关键词：Erosivity index ; R factor ; Soil conservation ; Soil erosion ; Time scales ; USLE
• 刊名：Natural Hazards
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：77
• 期：1
• 页码：383-404
• 全文大小：2,284 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geophysics and Geodesy
  Geotechnical Engineering
  Civil Engineering
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-0840

文摘

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 (1970-992) 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, ?3 and ?.316.