Abstract
Empirical models such as the universal soil loss equation (USLE) are used to measure sediment production. Applying the USLE requires determining the rainfall erosivity factor R. This factor is calculated from the EI30 value, which is based on semi-hourly rainfalls that are costly to obtain. In this study, a model for transposing the R factor from regions with semi-hourly rainfall data to regions with only daily rainfall data is proposed. EI30 values were calculated and related to the rainfall coefficient Rc. Potential correlation model was fitted to these data and transposed to a second area within the same climatic region. Observed rainfall data in this area yielded an EI30 of 9937.44 MJ mm ha−1 h−1. The transposed model gave an EI30 of 11,052.04 MJ mm ha−1 h−1. The error is 10.08%, which indicates that the methodology is suitable for estimating erosivity factors for locations that lack semi-hourly rainfall data.
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The data obtained and/or analysed during the study are available from the corresponding author upon request by e-mail.
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Acknowledgements
The authors would like to thank ANA and INMET for kindly providing rainfall data for current analysis. The authors would like to thank the Coordination for the Improvement of Higher Education Personnel—Brazil (CAPES)—Finance Code 001 and Amazon Foundation for Studies and Research Support (FAPESPA). The second author would like to thank the CNPq for funding a research productivity Grant (Process 308147/2021-9). We would like to thank the office for research (PROPESP) and the Foundation for Research Development (FADESP) of the Federal University of Pará through Grant no. PAPQ 2022.
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da Silva Barbosa, A.J.S., Blanco, C.J.C., de Melo, A.M.Q. et al. Model of transferability for the rainfall erosivity factor. Sustain. Water Resour. Manag. 9, 52 (2023). https://doi.org/10.1007/s40899-023-00833-2
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DOI: https://doi.org/10.1007/s40899-023-00833-2