Regional Frequency Analysis {RFA} | R Documentation |
The regional and at-site distribution are estimated via the Index Flood model. This is achieved with the regional L-moments.
regdist(lmom, loc, main, xlab, ylab, xliminf, xlimsup, draw.site = TRUE, ...) locdist(param.reg, mu, data, main, xlab, ylab, xlimsup, draw.data = TRUE, ...)
lmom |
A list. Typically, return of function
lmomreg . |
param.reg |
Vector of length 3 giving the value of the parameter of the regional distribution. |
mu |
Numeric. The mean number of events per year. |
loc |
Optional numeric. If present, the location parameter is fixed to this value. |
data |
Vector of the at-site sample. |
main, xlab, ylab, xliminf, xlimsup |
Optional. Specifies the title, labels for the x and y axis and the lower and upper bound for the x-axis. |
index.flood |
A function who compute the index flood in functions of the at-site sample. The default is to compute the sample mean. |
draw.site, draw.data |
Logical. Should adimensional distribution of all site and at-site sample be plotted. The default is to plot it. |
... |
Optional parameters to be passed to the
plot function. |
The Index Flood model [Dalrymple, 1960] states that all distribution within a homogeneous region are the same up to a normalisation by a constant - namely, the Index Flood. So, estimate the distribution of a specified site can be performed in two step:
The regional distribution is estimated with the mean of L-moments of each site weighted with the record length [Hosking and Wallis, 1997].
The program return the parameter estimate of the regional and at-site distribution. Optionally, return level plots are displayed.
Mathieu Ribatet
Dalrymple, T. (1960) Flood Frequency Analysis. Water Supply Paper.
Hosking, J. R. M. and Wallis, J. R. (1997) Regional Frequency Analysis. Cambridge University Press.