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FIG. 9. . Two-dimensional spatial distribution of Br concentration in the soil solution at the end of the experiments on Day 140 (7 May 1997) of transect 2 for (a) observations (DATA), and simulations obtained with (b) the two-dimensional single porosity model (2D-SPM), (c) the two-dimensional dual-permeability model (2D-DPERM) for the soil matrix (SM) domain, (d) the 2D-DPERM for the preferential flow (PF) domain, and (e) the 2D-DPERM composite Br concentration (related to bulk soil volume, Eq. [1d]). The 2D-DPERM simulations assumed Br application in the SM domain only and relatively low mass transfer rate coefficient.
