Abstract
Sending acoustic pulses through soil columns, one obtains information on the soil’s elasticity characteristics and therefore on its state of humidity. In this laboratory water flow was investigated through 30×30×100-cm3 columns of undisturbed and unsaturated soil. The initial peak of the sound wave arriving at the detector is assumed to be ballistically transmitted through the soil. Its frequency is 10 kHz, thus a spatial resolution of about 6 cm is expected. The present aim is to obtain spatial and temporal information about the soil water distribution by a tomography technique. On this poster acoustic absorption and propagation time measurements during water infiltration are presented. The data are compared with conventional soil humidity measurements by time domain reflectometry.
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