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In 1988, the R-factor at approximately 850 locations was published as part of the rainfall erosivity evaluation conducted by ICONA (1988).
The goal was not only to obtain a representative sample of the geography throughout mainland Spain, but also to characterize the broad rainfall erosivity range previously identified by ICONA.
Rainfall data were employed to perform a regression analysis between R-factor values reported by ICONA and the four estimators presented in Section 2.
These values were then correlated with the single computed R-factor reported by ICONA (1988) for each station.
The slope obtained for R-ICONA suggests that the current regression model proposed by ICONA (Eqs.
5, in which the vertical axis represents measured R-factor reported by ICONA (Table 1) and the horizontal axis represents predicted R-factor.
Validation of the regression model proposed by ICONA
It was found that most of the points fell below the identity line, which indicated the regression model proposed by ICONA overpredicted the R-factor.
Al comparar ambas adaptaciones de erosividad, se nota claramente que los valores generados de R con el IFM resultan ser mayores a los generados por ICONA.
El analisis univariado se presenta en la tabla V, de acuerdo al promedio, ambas adaptaciones de erosividad presentaron valores bajos, por su parte la erosividad de ICONA presento valores de desviacion y coeficiente de variacion superiores a la erosividad con IFM, lo que se interpreta como mayor variabilidad de este factor en el periodo de evaluacion.
a) se observa que el metodo de estimacion de erosividad utilizando la ecuacion de ICONA mostro mayor variacion de los datos con respecto a los valores generados utilizando el IFM.
Con base a la ecuacion de erosividad utilizando la aproximacion de Arnoldus (IFM) (1980) que se correlaciona con el valor de erosividad de ICONA (1988)se pueden plantear algunas limitaciones con relacion a las diferencias, la primera de ellas es la dependencia de la ecuacion al origen de las precipitaciones en Espana y a la localizacion de los ensayos.