mfi: Modified Fournier Index

In ClimInd: Climate Indices

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 = ∑_{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)

Example output

Loading required package: SPEI
Loading required package: lmomco
Loading required package: parallel
Loading required package: ggplot2
# Package SPEI (1.7) loaded [try SPEINews()].
Loading required package: chron
Loading required package: weathermetrics
    2050     2051     2052     2053     2054     2055     2056     2057 
      NA       NA       NA       NA       NA       NA       NA       NA 
    2058     2059     2060     2061     2062     2063     2064     2065 
      NA       NA       NA       NA       NA       NA       NA       NA 
    2066     2067     2068     1969     1970     1971     1972     1973 
      NA       NA       NA       NA       NA       NA       NA       NA 
    1974     1975     1976     1977     1978     1979     1980     1981 
      NA       NA       NA       NA       NA       NA 51.07613 55.77621 
    1982     1983     1984     1985     1986     1987     1988     1989 
53.52549 73.62745 75.93658 42.47148 55.61707 55.51285 97.43407 67.05664 
    1990     1991     1992     1993     1994     1995     1996     1997 
44.37907 48.48964 55.39864 43.96017 41.11256 48.23518 61.08996 64.65239 
    1998     1999     2000     2001     2002     2003     2004     2005 
58.31919 42.65964 43.05315 37.74063 57.59642 62.57652 52.75712 38.28674 
    2006     2007     2008     2009     2010     2011     2012     2013 
38.14268 55.86993 88.46836 46.17033 52.59139 52.01735 52.87880 57.12944 
    2014     2015     2016     2017 
47.15659 47.59849 55.78659 37.96288 

ClimInd documentation built on April 10, 2021, 1:06 a.m.