### ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

## 3aPAb2. Influence of turbulent intermittency on acoustic scattering in the
atmosphere.

**D. Keith Wilson
**

**
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*Dept. of Meteorol., Penn State Univ., 503 Walker Bldg., University Park, PA
16801
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The classical treatment of wave scattering by turbulence does not account
for the influence of turbulent intermittency. Intermittency causes quantities
such as the scattering cross section to vary in space and time. It is
particularly important to account for intermittency when there are energetic
eddies having dimensions larger than the scattering volume, as is typically the
case for scattering problems involving atmospheric turbulence. The
conditional-probability method developed by Gurvich and Kukharets for
incorporating intermittency effects will be discussed and applied to the problem
of acoustic wave scattering by atmospheric turbulence. It will be shown that
intermittency can dramatically increase the probability of measuring large
values of the scattered intensity. The effect of combined intermittency in the
temperature and velocity fields will also be considered.