Influence d'une turbulence thermique sur la propagation du son dans l'atmosphère en présence d'une zone d'ombre

A numerical technique for simulating the acoustic wave propagation through a turbulent atmosphere is introduced. We first generate a random homogeneous and isotropic medium by creating N independent realizations in terms of discrete Fourier modes. Then, for each realization, we solve a parabolic equation using a Split step Padé algorithm. Finally, we calculate the mean intensity of the acoustic field and its phase and amplitude fluctuations. Our numerical results are compared with outdoor measurements