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Abstract. The study of water movement in soils is of fundamental\udimportance in hydrologic science. It is generally\udaccepted that in most soils, water and solutes flow through\udunsaturated zones via preferential paths or fingers. This\udpaper combines magnetic resonance imaging (MRI) with\udboth fractal and multifractal theory to characterize preferential\udflow in three dimensions. A cubic double-layer column\udfilled with fine and coarse textured sand was placed\udinto a 500 gauss MRI system. Water infiltration through\udthe column (0.15×0.15×0.15m3) was recorded in steady\udstate conditions. Twelve sections with a voxel volume\ud0.1×0.1×10mm3 each were obtained and characterized using\udfractal and multifractal theory. The MRI system provided\uda detailed description of the preferential flow under steady\udstate conditions and was also useful in understanding the dynamics\udof the formation of the fingers. The f ( ) multifractal\udspectrum was very sensitive to the variation encountered\udat each horizontally-oriented slice of the column and provided\uda suitable characterization of the dynamics of the process\udidentifying four spatial domains. In conclusion, MRI\udand fractal and multifractal analysis were able to characterize\udand describe the preferential flow process in soils. Used\udtogether, the two methods provide a good alternative to study\udflow transport phenomena in soils and in porous media.CIDA-Canada through the ALTAGRO ProjectFAPESP (07/58561-7

Characterizing water fingering phenomena in soils using magnetic resonance imaging and multifractal theory