Shallow Water Acoustics

Time-Domain Simulations of Acoustic Propagation Through Shallow Water

Shira Lynn Broschat, John B. Schneider, and Patrick J. Flynn

shira@eecs.wsu.edu, schneidj@eecs.wsu.edu, flynn@er4.eng.ohio-state.edu

Washington State University
Electrical Engineering & Computer Science
PO Box 642752
Pullman, WA 99164-2752
FAX: (509) 335-3818

This research was supported by the Office of Naval Research (Code 321OA).

These animations show the acoustic pressure found within a 36.00 m by 6.075 m (118.11' by 19.9311') computational domain. Four separate simulations are presented. In each simulation the source consists of a twenty element phased array. Transient illumination is used and the center frequency is 7.5 kHz ( m). The average water depth is 5.28125 m (17.3269'). Each animation represents 25.0 ms of real-time data.

These animations are stored as MPEG files. You will need access to an MPEG player to view them.

The four simulations are as follows:

Flat.
- Flat pressure release air-sea interface.
- Flat hard bottom.
- No scatterer present.
- Flat
Flat & scatterer.
- Flat pressure release air-sea interface.
- Flat hard bottom.
- Hard scatterer present. Circular, radius = 0.3 m. Distance from source is approximately 22 m.
- Flat & scatterer
Rough.
- Randomly rough pressure release air-sea interface (one realization). , .
- Randomly rough hard bottom (one realization). , .
- No scatterer present.
- Rough
Rough & scatterer.
- Randomly rough pressure release air-sea interface (one realization). , .
- Randomly rough hard bottom (one realization). , .
- Hard scatterer present. Circular, radius = 0.3 m. Distance from source is approximately 22 m.
- Rough & Scatterer

Note that is the rms surface height and is the correlation length.