社団法人　物理探査学会
第116回(平成19年度春季)学術講演会

講演要旨(和文) 講演要旨(英文) We examined the infiltration pattern and monitored infiltration process in an undisturbed filed soil using a combined method of dye tracer test and electrical resistivity tomography. A homogeneous matrix flow was observed in the surface soil (A horizon) but a preferential flow along macropores such as crack and residual rock structure such as vein was the dominant infiltration pattern. The saturated interflow along the slopping boundaries of A and C1 horizons and of upper sandy layer and lower thin clay layer in C horizon was also observed. The result of electrical resistivity tomography (ERT) showed that matrix flow started first in A horizon and then the infiltration was followed by the preferential flows along the sloping interfaces and macropores. The ERT did not showed as detail as the dye stain image for the preferential flow. However, the area with the higher staining density for the preferential flow showed the relative lower electrical resistivity. The result of this study indicates that ERT has a high applicability in the monitoring of solute transportation in vados zone.