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Natural hazards in the mountainous region of Rio de Janeiro state, Brazil: rainfall erosivity as an early warning index
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  • Geovane Alves,
  • Carlos de Mello,
  • Li Guo,
  • Michael Thebaldi
Geovane Alves
Universidade Federal de Lavras
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Carlos de Mello
Universidade Federal de Lavras
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Li Guo
Sichuan University
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Michael Thebaldi
Universidade Federal de Lavras
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Abstract

Rainfall erosivity is defined as the potential of rain to cause erosion. It has great potential for application in studies related to landslides and floods, in addition to water erosion. The objectives of this study were: i) to model the Rday using a seasonal model for the Mountainous Region of the State of Rio de Janeiro (MRRJ); ii) to adjust thresholds of the Rday index based on catastrophic events which occurred in the last two decades; and iii) to map the maximum daily rainfall erosivity (Rmaxday) to assess the region’s susceptibility to rainfall hazards according to the established Rday limits. The fitted Rday model presented a satisfactory result, thereby enabling its application as an estimator of the daily rainfall erosivity in MRRJ. Events that resulted in Rday > 1,500 MJ.ha-1.mm.h-1.day-1 were those with the highest number of fatalities. The spatial distribution of Rmaxday showed that the entire MRRJ has presented values that can cause major rainfall. The Rday index proved to be a promising indicator of rainfall hazards, which is more effective than those normally used that are only based on quantity (mm) and/or intensity (mm.h-1) of the rain.

Peer review status:UNDER REVIEW

24 Jun 2021Submitted to Land Degradation & Development
25 Jun 2021Assigned to Editor
25 Jun 2021Submission Checks Completed
28 Jun 2021Reviewer(s) Assigned
06 Aug 2021Review(s) Completed, Editorial Evaluation Pending