Influence of turbulence on train noise.

The subject of this paper is the long distance propagation of train noise. The sound exposure level of train noise L AE was measured. To describe the results of measurements, a semi-analytical model was used. It takes into account the wave-front divergence, air absorption, ground effect, and the turbulence destroying the coherent nature of the ground effect. The model contains three adjustable parameters that must be estimated at the site. To verify the model, we performed measurements of L AE at the distance D = 450 m from the train track center. The difference between the calculated and measured mean values of L AE equals 1.3 dB. [ABSTRACT FROM AUTHOR]