Calculation of meteorological conditions effects on outdoor sound propagation using parabolic equation

摘要

For long distance sound propagation, the variation of the atmospheric conditions can produce large modification on the sound pressure level (SPL) at the receiver. With respect to homogeneous conditions i.e when wind and temperature effects are negligible, the range of SPL variation due to vertical wind and temperature gradients can exceed several decibels. When simple sites (flat, without obstacle, etc...) have to be studied, analytical model are sufficiently accurate to predict long distance SPL. When complex environments have to be considered, only numerical models permit to consider all the parameters in a global approach. The Parabolic Equation (PE) method are one of these. In this study, we solve our problem through the Split-Step Pade (SSP) approach and the discrete random Fourier modes technique, method which seems to be very powerful and reliable for traffic noise prediction.