This function computes and plots the Flow Duration Curve (FDC) for observed and simulated discharge data. If multiple simulations are provided, a shaded band (min–max) and median line are shown. If only one simulation is provided, a single line is plotted.
Usage
plot_fdc(
sim,
obs,
run_ids = NULL,
scale_log = TRUE,
x_label = "Exceedance Probability (%)",
y_label = "Discharge (log scale)",
title = "Flow Duration Curve: Observed vs Simulated"
)Arguments
- sim
A data frame or matrix of simulated discharge time series. Columns are assumed to represent different simulation runs, and one column should be named "date" for the date/time information. If only one simulation is provided, it will be plotted as a single line.
- obs
A data frame with two columns: "date" and "discharge", where "date" contains the date/time information and "discharge" contains the observed discharge values.
- run_ids
Optional. A character, numeric or a vector of character strings specifying which simulation run IDs to include (e.g.,
c("0001", "0002")). Matching is done by name, so exact character matching is recommended.- scale_log
Logical. If
TRUE(default), a log-10 transformation is applied to the y-axis.- x_label
Label for the x-axis. Defaults to "Exceedance Probability (%)".
- y_label
Label for the y-axis. Defaults to "Discharge (log scale)".
- title
Plot title. Defaults to "Flow Duration Curve: Observed vs Simulated".
Examples
if (FALSE) {
# Example with simulated and observed time series
plot_fdc(sim = sim_data, obs = obs_data, run_ids = c("0001", "0002"))
}