This chapter presents a conceptually straightforward treatment of spatial correlations of “random” heterogeneous media, but does not intend to capture at this point even a majority of the actual behavior. A great deal of work still needs to be done since what has been accomplished so far neglects the expected geological complications due to patterns of deposition (on a wide range of scales), dewatering, alteration, deformation, and fracture. A fundamental point of this chapter will be that, even if a medium itself does not exhibit correlations, the transport properties of this medium will be correlated over distances which can be very large. In fact a simple physical result emerges, namely that the length scale of correlations in the measurement of a conduction process is directly proportional to the size of the volume of measurement (Hunt [1], given in Sect. 9.3 here), known in the hydrologic community as the “support” volume. This result is observed over 3–4 orders of magnitude of length, i.e., over 10+ orders of magnitude of the volume [2]. Although there is no proof yet that the percolation theoretical prediction is at the root of this experimental result, it is certainly a viable candidate.
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References
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Hunt, A., Ewing, R. (2009). Applications of the Cluster Statistics. In: Percolation Theory for Flow in Porous Media. Lecture Notes in Physics, vol 771. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89790-3_9
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