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NOTES

Scale Dependency of the Effective Matrix Diffusion Coefficient

Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
^* Corresponding author (hhliu{at}lbl.gov).

Received 10 July 2003.

It has been recognized that matrix diffusion is an important process for retarding solute transport in fractured rock. Based on analyses of tracer transport data from a number of field tests, we demonstrate for the first time that the effective matrix-diffusion coefficient may be scale dependent and generally increases with test scale. A preliminary theoretical explanation of this scale dependency is also presented, based on the hypothesis that solute travel paths within a fracture network are fractals.

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