get_ROI: Estimate the radius of influence of a well

In gopalpenny/anem: Analytical element models for simple aquifers

Description

Estimate the radius of influence of a well

Usage

get_ROI(..., method)

Arguments

...	Variable parameters, depending on the method used. Single numbers or vectors (of equal length)
method	String containing the name of the desired method

Value

A numeric value indicating the horizontal radius of influence of the well.

Methods

The methods below are taken from Fileccia (2015). Acque Sotterranee - Italian Journal of Groundwater (http://www.doi.org/10.7343/AS-117-15-0144). The following strings can be input for the method variable, and must be accompanied by the corresponding variables as part of the ... input:

"cooper-jacob":

R=√{2.25 Tr t / S}, for confined aquifer after short pumping period. (Cooper and Jacob, 1946)

"aravin-numerov":

R=√{1.9 Ksat h t / n}, for unconfined aquifers (Aravin and Numerov, 1953)

"sichardt":

R=3000 s √{Ksat}, Sichardt formula for unconfined aquifers (Cashman and Preene, 2001)

Where:

• R = radius of influence [m]

• Tr = transmissivity [m^2/s]

• t = time [s]

• S = storage

• h = height of the water table above substratum [m]

• n = effective porosity

• Ksat = saturated hydraulic conductivity [m/s]

• s = drawdown in the borehole [m]

These inputs can be single numbers or vectors of equal length.

Examples

get_ROI(Tr=0.01,t=3600*12,S=1,method="cooper-jacob")
get_ROI(Ksat=0.0001,h=50,t=3600*12,n=0.4,method="aravin-numerov")
get_ROI(Ksat=0.0001,s=10,method="sichardt")

gopalpenny/anem documentation built on Dec. 20, 2020, 5:27 a.m.