flow_dimension: flow_dimension

In khaors/pumpingtest: R Package for the analysis and evaluation of pumping tests

Description

Function to calculate the flow dimension using different approaches

Usage

flow_dimension(t, s, d = 2, method = "central")

Arguments

t	Numeric vector with time values
s	Numeric vector with drawdown values
d	Derivative parameter. if method equals to bourdet then d is equal to the number of adjacent values used in the derivative calculation. If method is equal to spline then d is equal to the number of knots used in the interpolation of the drawdown data. In this case a value of d=20 to d=30 is recommended. If method is equal to spane then d is equal to the number of points used in the linear regression approach.
method	Method to calculate the derivative. See log_derivative

Value

This function returns a list with components:

• x: Numeric vector with times at which the second derivative is evaluated

• y: Numeric vector with the values of the second derivative of drawdown

• n: Numeric vector with the flow dimension values evaluated at each time

Author(s)

Oscar Garcia-Cabrejo, [e-mail]

Examples

data(boulton)
t <- boulton$t
s <- boulton$s
boulton.fdim <- flow_dimension(t,s, method = "smoothspline")
plot(boulton.fdim$x, boulton.fdim$n, type = "p", log = "x", 
ylim = c(0, 10))

khaors/pumpingtest documentation built on Nov. 15, 2019, 8:10 p.m.