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

Seyed Sadeghi () and Zeinab Hazbavi

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2015, vol. 77, issue 1, 383-404

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. Copyright Springer Science+Business Media Dordrecht 2015

Keywords: Erosivity index; R factor; Soil conservation; Soil erosion; Time scales; USLE (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
http://hdl.handle.net/10.1007/s11069-015-1607-z (text/html)
Access to full text is restricted to subscribers.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:nathaz:v:77:y:2015:i:1:p:383-404

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/11069

DOI: 10.1007/s11069-015-1607-z

Access Statistics for this article

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards is currently edited by Thomas Glade, Tad S. Murty and Vladimír Schenk

More articles in Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards from Springer, International Society for the Prevention and Mitigation of Natural Hazards
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().