tools:::Rd_package_description("lfstat")
tools:::Rd_package_author("lfstat")
Maintainer: tools:::Rd_package_maintainer("lfstat")
lfobj (Low-Flow-Objects)The package calculates indices and makes graphics for low flow
analysis. It brings its own class 'lfobj', a special data.frame format
with columns 'day', 'month', 'year', 'flow', 'hyear' and possibly 'baseflow'.
'day', 'month' and 'year' refer to the date, 'flow' is the measured
runoff (unit-independent), 'baseflow' the calculated base flow.
'hyear' refers to the hydrological year. When creating the 'lfobj' you
define the month where the stations hydrological year starts. If annual indices are
calculated or single years are plotted, the 'hyear' is taken.
Basically there are to options to create an low flow object:
If you have special data format, e.g. GRDC, you can use the function
readlfdata, see ?readlfdata to see which formats are currently
supported.
Otherwise you can use createlfobj. You can apply it for new data in
one of two ways:
1) You create a data.frame with columns: 'day', 'month', 'year' and
'flow'.
2) You create a time-series ('ts') from 'flow' and give the start date of
the series when calling 'createlfobj'.
lfstat does not need to know the unit of the flow, but you might want it
to appear in your plots. You can use setlfunit to define how units are
labelled in your graphics. Examples are given in '?setlfunit'.
Please check for NA-values using lfnacheck, indices and plots are made
as if series were complete. See the manual on how to deal with missing
values and, if reasonable, use lfnainterpolate.
meanflow
Qxx
MAM (mean annual minima)
BFI
recession (recession constant)
streamdef (Streamflow deficit)
tyears (Extreme value - T-years event)
seasratio
seasindex
multistationsreport
hydrograph
recessionplot (Diagnosis for recession)
fdc (Flow-duration-curve)
sbplot (seasonal bar chart)
seglenplot (select recession length for recession)
streamdefplot (Streamflow deficit)
rfa (Regional frequency analysis)
dmcurve (Double mass curve)
tools:::Rd_package_indices("lfstat")
Gustard, A. & Demuth, S. (2009) (Eds) Manual on Low-flow Estimation and Prediction. Operational Hydrology Report No. 50, WNO-No. 1029, 136p. https://library.wmo.int/doc_num.php?explnum_id=7699