ClimInd (version 0.1-2)

mfi: Modified Fournier Index

Description

The precipitation concentration index is frequently associated to erosion risk. Values: 0-60 very low; 60-90 Low; 90-120 moderate; 120-160 high; > 160 very high.

Usage

mfi(data, data_names = NULL, na.rm = FALSE, ...)

Arguments

data

precipitation

data_names

names of each period of time

na.rm

logical. Should missing values (including NaN) be removed?

...

...

Value

MFI

Formula

$$MFI = \sum_{i=1}^{12} \frac{P_i ^ 2} {P_t}$$

References

Fournier F. 1960. Climat et Erosion. PUF: Paris. Arnoldus HM. 1980. An approximation of the rainfall factor in the Uni-versal Soil Loss Equation. In Assessments of Erosion, de Boodts M,Gabriels D (eds). John Wiley and Sons Ltd, Chichester 127<U+2013>132. De Luis M., Gonz<U+00E1>lez-Hidalgo J.C., Longares L.A. Is rainfal erosivity increasing in the Mediterranean Iberian Peninsula?. Land Degradation & Development, 21: 139-144.

Examples

# NOT RUN {
data(data_all)
mfi(data = data_all$rr)
# }