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Airborne Acoustic Method to Determine the Volumetric Water Content of Unsaturated Sands

This paper describes a new experimental approach for the determination of volumetric water content of porous materials such as sands using acoustic measurement of the surface admittance. The proposed technique is non-destructive, non-invasive and produces measurements within seconds. A model has been proposed and validated. The coefficients in the proposed model can easily be determined using standard testing or predicted for a broad range of sands. The proposed technique is very useful for measurement of water saturation which is a key parameter required for accurate modelling of unsaturated soil behaviour and contaminant transport.