seasonality: Calculate seasonality of discharge

In hydrostats: Hydrologic Indices for Daily Time Series Data

Calculate seasonality of discharge

Description

Returns statistics decribing seasonal variation in runoff.

Usage

seasonality(flow.ts, monthly.range = FALSE)

Arguments

flow.ts	Dataframe with date and discharge data in columns named "Date" and "Q" respectively. Date must be in POSIX format (see ts.format). Missing values are ignored.
monthly.range	logical. If FALSE (default), the function returns the percentage of runoff occurring during the average driest 6 month period (as defined across all years). If true, additional statistics describing cumulative average monthly flows, the range between the runoff in the wettest and driest months, and the average number of months between the wettest and driest periods of runoff.

Value

If monthly.range=FALSE (default) the function returns a dataframe with one column with the percentage of annual runoff delivered during the average driest 6 month period.

If monthly.range=TRUE, the function returns a list with the following elements:

seasonality	The percentage of annual runoff delivered during the driest 6 months
monthly.means	Average flow in each month of the year
avg.ann.month.range	Average difference between the monthly minimum and maximum
max.min.time.dif	Average number of months between the highest and lowest monthly runoff

Author(s)

Nick Bond <[e-mail]>

Examples

data(Cooper)
Cooper<-ts.format(Cooper)

seasonality(Cooper, monthly.range=TRUE)

hydrostats documentation built on June 1, 2022, 9:06 a.m.