Rev. Bras. Ciênc. Solo.2002;26(3):695-703.

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Rainfall, runoff, and rainfall-runoff erosivity parameters correlated with soil losses of a haplargids, Paraiba state, Brazil

A. W. Albuquerque, F. Lombardi Neto, A. Cataneo, V. S. Srinivasan, J. R. Santos

01/Sep/2002

DOI: 10.1590/S0100-06832002000300014

Simple linear, multiple linear and nonlinear correlations between rainfall, runoff and rainfall-runoff erosivity parameters were studied, as well as soil losses caused by erosive rainfall on a Haplargids. Data were obtained in the period from 1986 to 1990 at the Experimental Station in Sumé, which belongs to the Universidade Federal da Paraíba – UFPB, Paraíba State, Brazil. Individual rainfalls registered in 136 rain gauges were analyzed for the determination of rainfall, runoff and rainfall-runoff erosivity parameters. The runoff volume, single or combined with rainfall characteristics improved the estimated soil losses of individual rainfall significantly. The erosivity parameters for rainfall-runoff a(V_u α I₃₀)^b; a(V_u α I₅)^b; a(EIA)^b and runoff a(V_u)^b were best fit to estimate soil losses caused by individual storms. The rainfall erosivity parameters that included the product of rainfall volume at a maximum intensity for thirty minutes (VrI₃₀) were the ones that correlated best with soil losses.