The Borehole function models water flow through a borehole. Its simplicity and quick evaluation makes it a commonly used function for testing a wide variety of methods in computer experiments.
The response is water flow rate, in m3/yr.
Input Domain and Distributions:The input variables and their usual input ranges are:
|rw ∈ [0.05, 0.15]||radius of borehole (m)|
|r ∈ [100, 50000]||radius of influence (m)|
|Tu ∈ [63070, 115600]||transmissivity of upper aquifer (m2/yr)|
|Hu ∈ [990, 1110]||potentiometric head of upper aquifer (m)|
|Tl ∈ [63.1, 116]||transmissivity of lower aquifer (m2/yr)|
|Hl ∈ [700, 820]||potentiometric head of lower aquifer (m)|
|L ∈ [1120, 1680]||length of borehole (m)|
|Kw ∈ [9855, 12045]||hydraulic conductivity of borehole (m/yr)|
For the purposes of uncertainty quantification, the distributions of the input random variables are:
|rw ~ N(μ=0.10, σ=0.0161812)|
|r ~ Lognormal(μ=7.71, σ=1.0056)|
|Tu ~ Uniform[63070, 115600]|
|Hu ~ Uniform[990, 1110]|
|Tl ~ Uniform[63.1, 116]|
|Hl ~ Uniform[700, 820]|
|L ~ Uniform[1120, 1680]|
|Kw ~ Uniform[9855, 12045]|
Above, N(μ, σ) is the Normal distribution with mean μ and variance σ2. Lognormal(μ, σ) is the Lognormal distribution of a variable, such that the natural logarithm of the variable has a N(μ, σ) distribution.
Modifications and Alternative Forms:The range of Kw may be changed to [1500, 15 000], creating a more nonlinear and non-additive function, as in Morris et al. (1993) and Xiong et al. (2013).
In the context of emulating computer models with both quantitative and qualitative factors, Zhou et al. (2011) use the qualitative factors z1 = r, z2 = Hu–Hl and z3 = Kw, each at three levels. The remaining four variables are used as quantitative factors.
For the purpose of input variable screening, Moon (2010) and Moon et al. (2012) add 12 inert input variables.
For the purpose of multi-fidelity simulation, Xiong et al. (2013) use the following function for the lower fidelity code:
MATLAB Implementation, Lower Fidelity
R Implementation, Lower Fidelity
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For questions or comments, please email Derek Bingham at: firstname.lastname@example.org.