551.596The problem of acoustic radiation propagation through a lower 500-m plane-stratified turbulent atmospheric layer has been solved by the Monte Carlo method. Statistical estimates of the contribution of multiply scattered radiation to the transmitted acoustic radiation intensity are obtained. A point omnidirectional source of monochromatic acoustic radiation was placed at a height of 35 m above the absorbing Earth's surface. Statistical estimates of the contribution of multiply scattered radiation to the transmitted radiation intensity have shown that it does not exceed 15% for the outer scale of atmospheric turbulence L 0 = 10 m and sound frequency F = 1700 Hz, reaches 30% for L 0 = 20 m, and increases to 90% for L 0 = 80 m. A comparison of the calculated results with the available experimental data demonstrates their satisfactory agreement.
A problem of acoustic radiation propagation through a 500-m layer of the plane-stratified turbulent atmosphere is solved by the Monte Carlo method. Quantitative estimates of variations of the multiple scattering contribution to the transmitted radiation intensity are presented. Calculations were performed for mid-latitude regional models of the atmosphere in winter and summer in clear and cloudy days for a point-sized omnidirectional source placed at altitudes H s = 5-35 m above the Earth's surface. Results of calculations for sound frequencies in range F = 500-4000 Hz with a step of 500 Hz and for outer scale of turbulence L 0 = 1-5 m with a step of 1 m and 10-100 m with a step of 10 m demonstrate significant regional and seasonal variability of the multiple scattering contribution.
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