wtf: Water Table Rises

In USGS-R/DVstats: Functions to manipulate daily-values data

Water Table Rises

Description

Identify hypothetical groundwater rises based on extrapolated antecedent recession rates in hydrographs of daily values.

Usage

wtf(x, Dates, Start = NULL, End = NULL, MPelev = NULL,
  STAID = "Unknown")

Arguments

x	the daily value data to be summarized. Missing values are not permitted within the time specified by Start and end.
Dates	the date for each x, should be of class "Date." Missing values are not permitted.
Start	the start date for the analysis, can be either a character string or class "Date."
End	the end date for the analysis, can be either a character string or class "Date."
MPelev	the measuring point elevation. Required if x is a depth below land surface or measuring point.
STAID	the station identifier for the data.

Value

an object of class "rise" and inherits class "data.frame" of the selected data, a data frame of the recession information, and other information about the analysis.

Note

Healy and Cook (2002) descibe the water-table fluctuation method for estimating recharge.

The antecedent recession is modeled as log-linear recession, the projected recession is a fixed fraction of the current recession. The fraction is based on the last 8 days of the recession or extrapolated if the recession is less than 8 days and at least 4 days in length. If the recession is less than 4 days in length, the previous recession rate is carried forward. For any rises occuring before the first recession of at least 4 days, the recession rate is 0, which replicates the rise function.

References

Healy, R.W., and Cook, P.G., 2002, Using ground-water levels to estimate recharge. Hydrogeology Journal, v. 10, p. 91–109.

Examples

## Not run: 
library(smwrData)
data(GlacialRidge)
with(GlacialRidge, wtf(G12, datetime, MPelev=1126.42, STAID="G12"))

## End(Not run)

USGS-R/DVstats documentation built on Oct. 11, 2022, 6:03 a.m.