Abstract
The impact of ground physical parameters variations on the previsions of recent outdoor sound propagation numerical models can be substantial. Among these parameters, the air flow resistivity and the effective thickness of numerous soil types (in particular grass lawns) have to be characterized in situ. Thus, a two-microphone technique and a semi-automatic procedure have been developed in order to estimate the ground impedance parameters. The estimation method is based on a narrow-band fitting between the experimental sound level attenuation spectra and the analytical solutions for the measurement configuration. This approach is applied to three types of ground, both in winter and summer conditions. Results are analyzed and discussed in terms of space and time variabilities as well as the impact of such spatial and seasonal variations on sound pressure levels.
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