3d models of sound propagating in shallow water

3D models of sound propagating in shallow water

Alexander Tshoidze

Voronezh State University

50-200 m

Antenna

VerticalLinear array(VLA)at two depths

Range 10-100 km

source60-600Hz

Horizontallinear array (HLA)

Scheme of the shallow water problem model

What model do we construct

Acoustical model

of intensity fluctuations

of sound propagating

in presence of

temperature front,

internal waves,

depth slopes

and other

waveguide obstacles.

Polar front in the Barents sea

Oceanographic data was given by James F. Lynch fromWoods Hole Oceanographic Institution, MA, USA

The chart of horizontal refraction in the area close to temperature front

Arctic current

Northern-Atlantic current

My publications on the topic

1. B. Katsnelson, J. Lynch, A. Tshoidze Space-frequency distribution of sound field intensity in the neighborhood of a temperature front in shallow water // Acoustics Journal, August, 2007.

2. B. Katsnelson. A.Tshoidze, J.Lynch, Ta-Wei WangSpace frequency sound field distribution in the neighborhood of a temperature front // 147 Meeting Acoustical Society of America, San Diego, JASA, Vol. 116, Issue 4, 2004, Pp.2535-2536. 3. B. Katsnelson, J. Lynch, A. Tshoidze Space-frequency distribution of sound field intensity in the neighborhood of a temperature front in shallow water // XVII session of the Russian Acoustical Society, Moscow, Akustika Okeana, 2006, Pp. 92-95.

B. Katsnelson, A. Tshoidze – Voronezh State University, RussiaJ. Lynch, Ta-Wei Wang - Woods Hole Oceanographic Institution, Woods Hole, MA, USA

My speech at the meeting on the topic

Propagating of complex signal

My publications on the topic

1. B. Katsnelson, M. Badiey, J. Lynch, A. Tshoidze Low frequency sound pulses propagation in shallow water // Proceedings of the 8th European conference on Underwater Acoustics, Portugal, 8th ECUA, 2006, Pp. 217-222с. 2. B. Katsnelson, M. Badiey, A. Song, A. Tshoidze Propagation of modulated pulses in shallow water // 150th Meeting Acoustical Society of America, Providence, USA, JASA, Vol. 119, Issue 5, 2006, p. 3346.

B. Katsnelson, A. Tshoidze – Voronezh State University, RussiaM. Badiey, A. Song - University of Delaware, DE, USA J. Lynch - Woods Hole Oceanographic Institution, Woods Hole, MA, USA

Link to experiment Shallow Water Acoustic Remote

Measurements (SWARM’95)

New Jersey continental shelf, USA

A kind of data fromour American colleagues

Correlation of our model with the experiment

Data processing …… and results!

Delaware workshop on SWARM’95

April, 2005

Delaware workshop is going on

Future work

1. Creating complex sound field model, especially

phasefront model2. Comparing results of our

model with data of the experiment SWARM’06

Supported by CRDF VZ-010-0, RFFR 03-05-64568