Abstract:

Realizations of atmospheric turbulence, used as input for parabolic equation (PE) calculations, are commonly generated using a two-dimensional Fourier representation of the spatial fluctuations in refractive index, i.e., the turbulence field. A number of factors affect the nature of the generated turbulence and determine the character of the acoustic propagation. These factors include the turbulence spectrum (e.g., Gaussian, Kolmogorov, or von Karman spectra) and the number of Fourier modes included in the representation. The Green's function PE is used to calculate sound field characteristics in the case of upward refraction above an impedance plane using different turbulence fields.