ASA 124th Meeting New Orleans 1992 October

3pUW4. Application of the vector Bragg scattering wave-number condition to obtaining turbulent field variables.

Louis Goodman

Naval Undersea Warfare Ctr., Newport, RI

John Oeschger

Univ. of Rhode Island, Kingston, RI

Diane Szargowicz

Naval Undersea Warfare Ctr., Newport, RI

Peter Hebda

Americom Corp., Middletown, RI

Using the concept of the vector Bragg wave-number scattering condition, described in the previous presentation, the results of laboratory experiments on high-frequency broad bandwidth bistatic acoustic scattering from a buoyant turbulent plume are described. Estimates of a variety of characteristics of the turbulent field are made. These include a real time estimate of the spatial structure and wave-number spectra of the turbulent temperature field, and a simultaneous and real time estimate of the velocity field and the velocity variance field. Examination into the occurrence of organized structure will be made. Discussion of the appropriateness of classical turbulence theory to the results will be made with emphasis given to the issue of inhomogeneity and anisotropy.