ASA 126th Meeting Denver 1993 October 4-8

5aPA8. Calculation of average turbulence effects on sound propagation based on a fast field program formulation.

Richard Raspet Wenliang Wu

Univ. of Mississippi, University, MS 38677

Daigle has published a series of papers in which he has applied the turbulent scattering theories of Chernov and Karavainikov to sound propagation over hard and finite impedance grounds. In these papers, Daigle has introduced the decorrelation in phase and amplitude due to turbulence along the direct and reflected path into the spherical wave reflection analysis for a nonrefracting atmosphere. The phase and amplitude decorrelation terms have been incorporated into the evaluation of the spectral integral of a fast field program for propagation in a refracting atmosphere. Although the calculation involves two significant approximations it reproduces Daigle's results for homogeneous atmospheres and compares well with the upward refraction measurement of Parkin and Scholes and with measurements taken under a variety of refractive conditions at Bondville, Illinois by the U.S. Army Construction Engineering Research Laboratory.