Skip to Main content Skip to Navigation
Journal articles

Ultra slow acoustic energy transport in dense fish aggregates

Abstract : A dramatic slowing down of acoustic wave transport in dense fish shoals is observed in open-sea fish cages. By employing a multi-beam ultrasonic antenna, we observe the coherent backscattering phenomenon. We extract key parameters of wave transport such as the transport mean free path and the energy transport velocity of diffusive waves from diffusion theory fits to the experimental data. The energy transport velocity is found to be about 10 times smaller than the speed of sound in water, a value that is exceptionally low compared with most observations in acoustics. By studying different models of the fish body, we explain the basic mechanism responsible for the observed very slow transport of ultrasonic waves in dense fish shoals. Our results show that, while the fish swim bladder plays an important role in wave scattering, other organs have to be considered to explain ultra-low energy transport velocities.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03363272
Contributor : Sergey Skipetrov Connect in order to contact the contributor
Submitted on : Sunday, October 3, 2021 - 5:44:37 PM
Last modification on : Wednesday, November 24, 2021 - 11:26:49 AM

File

Ultra_Slow_Acoustic_Energy_Tra...
Files produced by the author(s)

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Benoit Tallon, Philippe Roux, Guillaume Matte, Jean Guillard, John Page, et al.. Ultra slow acoustic energy transport in dense fish aggregates. Scientific Reports, Nature Publishing Group, 2021, 11 (1), pp.17541. ⟨10.1038/s41598-021-97062-4⟩. ⟨hal-03363272⟩

Share

Metrics

Record views

85

Files downloads

63