Abstract
We study the infiltration flow in a soil-model. Our question is how the flow decides the direction under the soil. The soil model consists of glass beads between two thin glass plates. We use 2.0mm diameters of glass beads whose diameters is similar to real sand constituting a granule. The meandering is typical flow pattern of the infiltration. The precursor of the flow direction is observed of the front edges of the flow by using the image processing. It is a thin film on the plates. The influence of single bead for meandering flow is studied. The angle between the center of bead and the front edge of droplet is measured when the droplet puts on a bead gently. The angle changed with the diameter of bead.
