| mfi {ClimInd} | R Documentation |
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 |
daily precipitation, mm |
data_names |
names of each period of time |
na.rm |
logical. Should missing values (including NaN) be removed? |
... |
further arguments passed to or from other methods |
Value
index value
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 127–132. De Luis M., González-Hidalgo J.C., Longares L.A. Is rainfal erosivity increasing in the Mediterranean Iberian Peninsula?. Land Degradation & Development, 21: 139-144.
Examples
data(data_all)
mfi(data = data_all$rr)