boulton_solution_dlogt: boulton_solution_dlogt

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

Description

Function to calculate the derivative of the drawdown with respect to the log of time using the Boulton solution

Usage

boulton_solution_dlogt(ptest, a, t0, t1, phi, t)

Arguments

ptest	value
a	Slope of the straight line fitted to the drawdown data using the Cooper-Jacob approach
t0	Intercept of the straight line fitted to the drawdown data using the Cooper-Jacob approach (early time)
t1	Intercept of the straight line fitted to the drawdown data using the Cooper-Jacob approach (late time)
phi	Delay parameter. Dimensionless parameter defined as φ = \frac{α_{1} r^{2} S}{T} where α_{1} is a fitting parameter without a physical estimation, r is the distance between the pumping and observation well, S is the storage coefficient and T is the transmissivity.
t	value

Value

This function returns

Author(s)

Oscar Garcia-Cabrejo [e-mail]

References

Boulton, N. The drawdown of the water-table under non-steady conditions near a pumped well in an unconfined formation. Proceedings of the Institution of Civil Engineers, 1954, 3, 564-579

See Also

Other boulton functions: boulton_WF_LT, boulton_calculate_parameters, boulton_solution, boulton_well_function

Examples

data(boulton)
ptest <- pumping_test('Well1', Q = 0.03, r = 20, t = boulton$t, s = boulton$s)
boulton.sol <- boulton_solution_initial(ptest)
boulton.dsol <- boulton_solution_dlogt(ptest, boulton.sol$a, boulton.sol$t0,
                boulton.sol$t1, boulton.sol$phi, boulton$t)

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