The present paper describes the relationship between the thickness of a water layer and its attenuation effect
on blast waves. The blast waves passing through the water layer were measured using piezoelectric sensors.
The results show that peak overpressures and scaled impulses were reduced by approximately 97% and 87%,
respectively at a scaled depth of 11.3m·kg-1/3. The water layer is confirmed to be extremely
effective in attenuating blast waves.
The impedance mismatch method was employed in order to estimate the blast wave pressure. It was found that the blast
wave pressure could be estimated by the impedance mismatch method for scaled depths deeper than 4m·kg-1/3.