MODEL STUDY OF SOUND-PROPAGATION OVER GROUND OF FINITE IMPEDANCE

Experimental results are presented for the sound level distribution at different distances from the source when the sound waves propagate over ground with finite impedance. The measurements have been carried out in an anechoic chamber using a point source and using materials that can be used to model both reflecting and absorbing surfaces. The results from the measurements are compared with the theoretically calculated ones. The latter are obtained making use of a one-parameter ground model to allow for the presence of the finite impedance of the ground.