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Updated: Mar 18, 2026

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
Published on: February 13, 2018
Measured depth-dependence of waveguide invariant in shallow water with a summer profile
Altan Turgut1, Laurie T Fialkowski1, Jeffrey A Schindall1
1Acoustics Division, Naval Research Laboratory, Code 7160, Washington, DC 20375, USA altan.turgut@nrl.navy.mil, laurie.fialkowski@nrl.navy.mil, Jeff.Schindall@nrl.navy.mil.
Abstract:
Acoustic-intensity striation patterns were measured in the time-frequency domain using an L-shaped array and two simultaneously towed broadband (350-650 Hz) sources at depths above and below the thermocline under summer profile conditions. Distributions of the waveguide invariant parameter β, extracted from the acoustic striation patterns, peak at different values when receivers are above or below the thermocline for a source that is below the thermocline. However, the distributions show similar characteristics when the source is above the thermocline. Experimental results are verified by a numerical analysis of phase slowness, group slowness, and relative amplitudes of acoustic modes.
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