th1.2: Function to return the TH1 and TH2 hydrologic indicator...

In jlthomps/EflowStats: Returns HIT/HAT Hydrologic Indicator stats for a given set of data

Description

This function accepts a data frame that contains a column named "discharge" and calculates TH1; Julian date of annual maximum. Determine the Julian date that the maximum flow occurs for each year. Transform the dates to relative values on a circular scale (radians or degrees). Compute the x and y components for each year and average them across all years. Compute the mean angle as the arc tangent of y-mean divided by x-mean. Transform the resultant angle back to Julian date (Julian day-spatial). and TH2; Variability in Julian date of annual maxima. Compute the coefficient of variation for the mean x and y components and convert to a date (Julian days-spatial).

Usage

  th1.2(qfiletempf)

Arguments

qfiletempf

data frame containing a "discharge" column containing daily flow values

Value

th1.2 list containing TH1 and TH2 for the given data frame

Examples

qfiletempf<-sampleData
th1.2(qfiletempf)

jlthomps/EflowStats documentation built on May 19, 2019, 12:48 p.m.