A
combined method of electrical resistivity tomography
and dye tracer test was tested for monitoring of water infiltration in an
undisturbed forest soil developed from granite. A 1 m * 1 m acryl frame was
installed on the leveled surface and 3 lines of electrodes were installed in
the framed area. The framed area was flooded with 300 L of Brilliant Blue FCF
solution at 5 g L-1 and the electrical resistivity
was measured before and after the flooding. After 3 days of the flooding, the
framed profile was vertically excavated at 10 cm interval and the vertical
stain image was also recorded using a digital camera. The dye stain images revealed
4 types of infiltration patterns in the profile: matrix flow in A horizon, lateral flow at the interface of A and C horizons,
fingering in the upper part of C horizon and macropore
flow in C horizon. The stain images and the electrical resistivity
images were matched very well. The result of this study indicates that the
electrical resistivity tomography can be utilized for
the monitoring of water infiltration in a soil profile.