seglenplot | R Documentation |
Plots a bar chart to find a good value for argument 'seglength'
when using
recession
.
seglenplot(lfobj, threslevel = 70, thresbreaks = c("fixed","monthly","seasonal"), thresbreakdays = NULL, rainpeaklevel = 0.95, na.rm = TRUE)
lfobj |
An object of class |
threslevel |
The threshold level (70 means Q70) |
thresbreaks |
|
thresbreakdays |
Needed if |
rainpeaklevel |
A level between 0 and 1 or a logical vector, see details. |
na.rm |
Should NAs in the series be ignored? |
For recession analysis it is necessary to define flood discharge peaks
(rain peaks) in the hydrograph. Argument rainpeaklevel
defines a day to be a
discharge peak, if rainpeaklevel * flow > flow[day before]
and
rainpeaklevel * flow > flow[day after]
.
If 'thresbreakdays'
or 'seasonbreakdays'
is a single day, e.g. '01/06'
, the start of the hydrological year is taken as the second break day. If more than two seasons are to be specified, a vector of all break days is needed.
A bar chart
Other then in the manual, we implemented a bar chart instead of a histogram. To save space, empty bars are not plotted!
Daniel Koffler and Gregor Laaha
Gustard, A. & Demuth, S. (2009) (Eds) Manual on Low-flow Estimation and Prediction. Operational Hydrology Report No. 50, WNO-No. 1029, 136p.
recession
data(ngaruroro) seglenplot(ngaruroro)
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