VulnToolkit (version 1.1.4)

fld.dur: Flooding duration

Description

Calculates the percent of time an elevation is submerged

Usage

fld.dur(z, level)

Arguments

z

elevation of interest

level

a numeric vector of water levels. Time interval between measurements must be uniform.

Value

value the decimal fraction of measurements in level that fall above z

Details

Calculates the percent of time an elevation is submerged

See Also

fld.frq

Examples

# NOT RUN {
data(NL_6min_2013)
a <- fld.dur(0.9117, NL_6min_2013[,2]); a # flooding duration at MHW
a * length(NL_6min_2013[,2]) / 10 # convert to hours per year

b <- fld.dur(0, NL_6min_2013[,2]); b # flooding duration at MLLW
b * length(NL_6min_2013[,2]) / 10 # hours per year

elev.dur <- data.frame(elev = seq(from = -0.5, to = 1.25, by = 0.005))
elev.dur$dur <- fld.dur(elev.dur$elev, NL_6min_2013[,2]) * length(NL_6min_2013[,2]) / 10 

plot(elev.dur$dur ~ elev.dur$elev, pch = 19, 
ylab = "flooding duration (hours per year)", xlab = "elevation (m; MLLW)")
# }