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Quantifying the Influence of Intra-Aggregate Concentration Gradients on Solute Transport

^a CSIRO Land and Water, Davies Lab., University Rd., Townsville, Australia

View larger version (12K): [in a new window]   Fig. 1 Schematic diagram showing the sequence of wet and dry periods imposed on a single spherical aggregate

View larger version (14K): [in a new window]   Fig. 2 Single Spherical Aggregate (SSA) model output showing the fraction leached as a function of t* for continuous leaching

View larger version (23K): [in a new window]   Fig. 3 Single Spherical Aggregate (SSA) model output showing the fraction leached as a function of t*L for various values of wet period duration (*). Note that * gives continuous leaching

View larger version (21K): [in a new window]   Fig. 4 Single Spherical Aggregate (SSA) model output showing the fraction leached as a function of t*L for various wet period frequencies. Note that */T* gives continuous leaching

View larger version (34K): [in a new window]   Fig. 5 Comparison between the Single Spherical Aggregate (SSA) model output and experimental data obtained with a column of packed spherical aggregates

View larger version (23K): [in a new window]   Fig. 6 Experimentally determined breakthrough curve for the Hydrosol as compared with ideal miscible displacement. These experimental data show very early breakthrough and pronounced tailing, both indicators of preferential flow

View larger version (19K): [in a new window]   Fig. 7 Comparison between the Single Spherical Aggregate (SSA) model output and experimental data for flow interrupted leaching experiments carried out on the Hydrosol core (Run 1)

View larger version (19K): [in a new window]   Fig. 8 Comparison between the Single Spherical Aggregate (SSA) model output and experimental data for flow interrupted leaching experiments carried out on the Hydrosol core (Run 2)

View larger version (18K): [in a new window]   Fig. 9 Comparison between experimental data for the flow interrupted leaching experiment (Run 1) and continuous leaching experiment (Run 3)