Mathematical Simulation of Infrasonic Waves Propagation Through Vegetation into Ground

In this paper, the processes of propagation the infrasonic acoustic waves in the lower atmosphere are investigated if a vegetable layer is presence. Analysis can carry out using 2D-simulation (instead 3D-simulation) due to enough large distance of from a source to forest massif. A three-layer model “Air-vegetation layer-ground” is considered. Authors study the problem of an interaction the acoustic waves falling at a given angle on the ground with vegetable layer and seismic waves arising in the ground. A question about the vegetation influence to amplitudes of the acoustic and seismic waves excited in the ground is investigated. The influence of a friction coefficient to the attenuation velocity of the acoustic oscillations in the vegetation is also estimated. An algorithm and a program for calculation the acoustic pressure levels in different media using wave equations for air, Euler's gas dynamics equations for vegetable layer and elasticity equation for the ground have been implemented and realized.