Estimate of rain erosivity in the Alto Sertão Alagoano through mathematical models
DOI:
https://doi.org/10.5016/geografia.v49i1.18080Abstract
Erosivity is defined as the potential of rain to cause soil erosion and is exclusively a function of the physical characteristics of the rain itself. The present study aimed to estimate the erosivity of rainfall based on rainfall data in the micro-regions that make up the high hinterland of Alagoas in the period from 1913 to 1985, based on three mathematical models proposed by Lombardi Netto; Moldenhauer (1992); Morais et al. (1991); and Rufino et al. (1993), rainfall data from six municipalities in the Alto Sertão of Alagoas were analyzed. The Serrana Microregion of Alto Sertão Alagoano, obtained the highest mean values of erosivity and Canapi, the lowest. The average monthly rainfall for the municipalities that make up the Serrana Microregion of Alto Sertão Alagoano was approximately 82.81 mm for Água Branca, 51.97 mm for Mata Grande and 47.55 mm for Canapi. The highest average monthly erosivity values were found in the Serrana Microregion of Alto Sertão Alagoano. The Sertão do São Francisco Alagoas Microregion presented the lowest erosivity and precipitation indices. The models showed a good correlation in all municipalities that make up the region of the high hinterland of Alagoas.
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