Abstract
The propagation of low-frequency sound above an impedance plane in a vertically stratified medium is considered. The combined effects due to the vector wind and temperature gradients on sound propagation are studied. Recently, a WKB-type approximation has been combined with turning point theory and applied to the efficient computation of the height-dependent Green's function, which, in turn, has been used in the fast field program (FFP). Although this method is applied to a temperature-stratified medium, it leads to a significant reduction in the computational time for predicting sound propagation outdoors. The present paper extends such a WKB-type approximation to include vector wind. Attention is focused on the development of efficient algorithms for numerical evaluation of the inverse Fourier transform and on considerations of numerical stability. The limitations of the approximation are examined for logarithmic profiles in particular.
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