PROPAGATION OF ACOUSTIC WAVES THROUGH PERMEABLE OBSTACLES
In this article, the authors performed mathematical simulation of infrasound acoustic waves propagation in the lower atmosphere across a vegetation taking into account the frictional force. In this case, the analysis was carried out for the 2D model because a source was at a distance much greater than an acoustic wavelength and acoustic wave front is assumed to be locally flat. The problem of the interaction of acoustic wave falling at a given angle to the ground with a vegetation layer on the surface and seismic waves arising in the ground in the “air-vegetable layer-ground” model is considered. The question of the influence of the vegetable layer on amplitudes of acoustic and seis-mic waves excited in the ground is investigated. Including the influence of the friction coefficient on the rate of acoustic oscillations attenuation in a vegetable medium is estimated. The algorithm and a program for calculating acoustic pressure levels in different media using the wave equation for the atmosphere, Euler's gas dynamics equations for vegetable layer and the elasticity equation for the ground have been developed and implemented.