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. Author manuscript; available in PMC: 2018 Dec 15.
Published in final edited form as: J Environ Manage. 2017 Apr 20;204(Pt 2):709–720. doi: 10.1016/j.jenvman.2017.04.033

Figure 2.

Figure 2

In many fractured-rock systems it is useful to conceptualize the rock as comprising two domains: (1) the mobile porosity (blue) consisting of connected permeable fractures, and (2) the immobile porosity (red) consisting of dead-end, disconnected or impermeable fractures and the rock matrix. Advection of solutes occurs only in the mobile porosity, and exchange occurs locally between the two domains according to various forms of diffusive rate-limited mass transfer (Carrera et al., 1998).