createlfobj {lfstat} | R Documentation |
Create an low flow object for further Low Flow Analysis
Description
Generic function for creating a low flow object (class 'lfobj'
). Low flow objects can be
created from a time series of daily flow, a data.frame with columns
"flow", "day", "month" and "year".
Usage
createlfobj(x, ...)
## S3 method for class 'data.frame'
createlfobj(x, hyearstart = NULL, baseflow = TRUE,
meta = list(),...)
## S3 method for class 'ts'
createlfobj(x,
startdate,
dateformat = "%d/%m/%Y",
...)
## S3 method for class 'lfobj'
createlfobj(x, hyearstart = NULL, baseflow = NULL,
meta = NULL,...)
Arguments
x |
An object out of which an object of class |
hyearstart |
integer between 1 and 12, indicating the start of the hydrological year. |
baseflow |
logical, should the base flow curve be calculated? Needed, if you want
to apply functions |
meta |
A list of meta-information |
startdate |
start of the time-series |
dateformat |
Format of the start date |
... |
Additional arguments, passed on to |
Details
'hyearstart'
defines the starting month of the hydrological year. If
'hyearstart'
is greater then 6.5, the hydrological year starts earlier
then the actual date, e.g. hyearstart = 10
, then the 1st of October 2011
is part of the hydrological year 2012. If hyearstart = 4
, then the 31st
of March 2011 is part of the hydrological year 2010.
When creating an object of class lfobj
with the aforementioned functions, eventually createlfobj.data.frame
is called.
Value
An object of class 'lfobj'
.
Author(s)
Daniel Koffler and Gregor Laaha
References
Gustard, A. & Demuth, S. (2009) (Eds) Manual on Low-flow Estimation and Prediction. Operational Hydrology Report No. 50, WNO-No. 1029, 136p.
See Also
Examples
# Creating a lfobj from a timeseries
# Some sample data:
somevalues <- rexp(365)
# Convert to time series:
time <- ts(somevalues)
# Lets say our data contains values from one hydrological year (Oct-Sep)
# starting on 1. Oct. 1992:
myriver <- createlfobj(time, startdate = "01/10/1992",hyearstart = 10)
# Add meta-data
createlfobj(myriver, meta = list(river = "myriver"))