## 2aAO12. Modeling internal gravity waves in a range-dependent medium.

### Session: Tuesday Morning, December 3

### Time: 11:00

**Author: Joseph F. Lingevitch**

**Location: Naval Res. Lab., Washington, DC 20375**

**Author: Michael D. Collins**

**Location: Naval Res. Lab., Washington, DC 20375**

**Author: William L. Siegmann**

**Location: Rensselaer Polytechnic Inst., Troy, NY 12180**

**Abstract:**

The parabolic equation (PE) method is a useful approach for solving
range-dependent ocean acoustics problems. The PE method can also be used to
model the propagation of internal gravity waves in the ocean. One of the
possible applications of a range-dependent gravity wave model to ocean acoustics
would be to generate a model-based noise spectrum that could be used as an
alternative or complement to the empirical spectrum of Garrett and Munk [J.
Geophys. Res. 80, 291--297 (1975)]. This could be done using the approach of
Kuperman and Ingenito for modeling surface-generated acoustic noise [J. Acoust.
Soc. Am. 67, 1988--1996 (1980)] for an appropriate distribution of gravity wave
sources. The mathematical details of a PE for gravity waves will be discussed.
Examples will be presented to illustrate the propagation of gravity waves in
range-dependent environments. [Work supported by ONR.]

ASA 132nd meeting - Hawaii, December 1996