Abstract
Effective description of flow and transport in irregular porous media, adequate understanding and reliable estimation of the uncertainty, all require stochastic approach. The primary problem is finding the relations between the non-random functionals of the unknown and the given random fields, that is moments, distribution functions, probability density distributions, etc. This paper considers the process of transport of non-reactive admixture in random media and attempts to develop a method for finding the probability density function of the concentration of the solute. We introduce the random functional p(x, t; c), the density distribution function (DDF) of the local random concentration c(x, t) in the one-dimensional phase space of its possible values c, where parameter x is multi-dimensional vector, and parameter t is time. By using the stochastic transport equation in the (x, t) space, one can write the so-called stochastic Liouville equation for the functional p(x, t; c) and this equation bears the form of the transport equation in the (x, t; c) space. The averaging of the new transport equation in the (x, t; c) space leads to equations for P(x, t; c) = 〈 p(x, t; c) 〉 – the probability density function (PDF) for c(x, t) and the corresponding power moments. We present the analysis examples of PDFs for the concentration c(x, t) in several different cases of flow velocity field and initial concentration distribution.
Similar content being viewed by others
References
Courant, R.: 1962, Partial Differential Equations, Interscience, New York.
Cramer, H.: 1963, Mathematical Methods of Statistics, Princeton University Press, Princeton, NJ.
Indelman, P. V. and Shvidler, M. I.: 1985, Averaging of stochastic evolution equations of transport in porous media, Fluid Dyn. 20(5), 775–784.
Klyatskin, V. I.: 1980, Stochastic Equations and Waves in Randomly Inhomogeneous Media, Nauka, Moscow (in Russian).
Shvidler, M. I.: 1985, Statistical Hydrodynamics of Porous Media, Nedra, Moscow(in Russian).
Shvidler, M. and Karasaki, K.: 1995, Exact averaging of stochastic equations for transport in porous media, Abstracts for the AGU Fall Meeting, San Francisco.
Shvidler, M. and Karasaki, K.: 1996, Averaged description of transport in random fields, Abstracts for the AGU Fall Meeting, San Francisco.
Shvidler, M. and Karasaki, K.: 1997, Probability density functions for solute transport in porous media, Abstracts for the AGU Fall Meeting, San Francisco.
Shvidler, M. and Karasaki, K.: 2003, Exact averaging of stochastic equations for transport in random velocity fields, Transport in Porous Media 50(3), 223–241.
Yaglom, A. M.: 1987, Correlation Theory of Stationary and Related Random Functions, Vols. I and II, Springer-Verlag, New York.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Shvidler, M., Karasaki, K. Probability Density Functions for Solute Transport in Random Field. Transport in Porous Media 50, 243–266 (2003). https://doi.org/10.1023/A:1021129325701
Issue Date:
DOI: https://doi.org/10.1023/A:1021129325701