Related Experiment Video
Updated: Apr 1, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
Passive acoustic observations of tide height in the Iroise Sea using ambient noise
G Bazile Kinda1, Julien Bonnel1
1Lab-STICC, UMR CNRS 6285, ENSTA Bretagne, Universite Europeenne de Bretagne, 2 rue Francois Verny, 29806 Brest Cedex 9, France bazile.kinda@gmail.com, julien.bonnel@ensta-bretagne.fr.
Abstract:
Considering a broadband motionless source in a waveguide with a depth that varies with time, the time-frequency representation of the acoustic intensity shows a striation pattern than can be explained using the depth-frequency waveguide invariant. This phenomenon is used here to describe acoustic data recorded in the Iroise Sea, where intense tides occur. The originality of this study is that the acoustic data consist of only ambient noise. The best hypothesis is that these striations are created by distant marine traffic in the Bay of Brest, and the results suggest that tide height can be monitored using long-term passive acoustics.
Related Concept Videos
Sound as Pressure Waves
The pressure fluctuation depends on the difference in displacements between the successive points in the...
Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Standing Waves
Tidal Forces
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
Echo
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...

