Effective hydraulic conductivity of nonstationary aquifers |
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| Authors: | Loaiciga H. A. Leipnik R. B. Hudak P. F. Marino M. A. |
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| Affiliation: | (1) Department of Geography and Environmental Studies, University of California, 93106 Santa Barbara, CA, USA;(2) Department of Mathematics, University of California, 93106 Santa Barbara, CA, USA;(3) Department of Geography, University of North Texas, 76203 Denton, TX, USA;(4) Department of Land, Air and Water Resources and Department of Civil Engineering, University of California, 95616 Davis, CA, USA |
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| Abstract: | Assuming that the ln hydraulic conductivity in an aquifer is mathematically approximated by a spatial deterministic  surface , or trend, plus a stationary random noise, we treat the problem of finding what the effective hydraulic conductivity of that aquifer is. This problem is tackled by spectral methods applied to a type of diffusion equation of groundwater flow, together with suitable coordinate transformations. Analytical (exact) solutions in terms of elementary functions are presented for one- and three-dimensional finite and infinite domains. Stability criteria are obtained for the solutions, in terms of a critical parameter, that turns out to involve the product of correlation scale and trend gradient. For the case of finite and symmetrical domains, additional provisions to insure the stability of numerical calculations of effective hydraulic conductivity are provided. Effective hydraulic conductivity is an important property, with potential applications in the calibrations of groundwater and transport numerical models. |
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| Keywords: | Stochastic diffusion equations effective hydraulic conductivity correlation scale heterogeneous aquifers spectral representation |
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