IDFcurves: Obtain Intensity-Duration-Frequency curves

In climatol: Climate Tools (Series Homogenization and Derived Products)

Obtain Intensity-Duration-Frequency curves

Description

Intensity-Duration-Frequency curves are obtained from a sub-hourly time series of precipitation by adjusting Generalized Extreme Value distribution to annual maxima of different time intervals.

Usage

IDFcurves(prdat, stname, clmn=1:2, tz='utc', na.code=NA,
prunits='mm', mindpy=0.8, gumbel=TRUE, timeaggr=c(10,20,30,60,120,180,360,720),
retper=c(5,10,20,30,50,75,100),...)

Arguments

prdat	Data frame with Time (as POSIXct) and sub-hourly precipitation data.
stname	Station name.
clmn	Columns where Time and precipitation data are located in prdat.
tz	Time zone ['utc' by default].
na.code	Numeric missing data code.
prunits	Precipitation units [mm].
mindpy	Minimum available data proportion to process data in any year.
gumbel	Adjust a Gumbel distribution? [TRUE].
timeaggr	Time intervals (in minutes) on which to aggregate precipitation.
retper	Return periods (in years) for extreme precipitation estimation.
...	Additional graphic parameters.

Details

The precipitation time series must be provided as a data frame with POSIXct times in the first column and precipitation in the second. However, these data can be in other columns of a wider data frame if the columns containing these variables are defined in the parameter clmn.

When setting gumbel=FALSE a Generalized Extreme Value distribution will be adjusted instead of the particular case of a Gumbel distribution.

Value

A table of maximum precipitation accumulations (totals, not mm/h as in the graphic) is returned invisibly.

Examples

## Not run: 
data(climatol_data)
tab <- IDFcurves(prec10min,'My airport',cex.axis=1.2,cex.lab=1.2) #IDF plot

## See the maximum precipitation accumulations in the different time intervals:
tab

## End(Not run)

climatol documentation built on June 22, 2024, 11:07 a.m.