Modeling low‐frequency acoustic scattering from densely populated fish schools

2004 ◽  
Vol 116 (4) ◽  
pp. 2488-2488
Author(s):  
Thomas R. Hahn
Keyword(s):  
Acoustic Scattering ◽  
Low Frequency ◽  
Fish Schools

The low‐frequency scattering action of fish schools

1994 ◽  
Vol 95 (5) ◽  
pp. 3020-3020
Author(s):  
Joel Garrelick ◽  
Miguel C. Junger ◽  
Mary L. Lamberton
Keyword(s):  
Low Frequency ◽  
Fish Schools

scholarly journals Simulation and analysis on low-frequency scattering characteristics of the finite cylindrical shell in shallow water

2019 ◽  
Vol 283 ◽  
pp. 03007
Author(s):  
Jinyu Li ◽  
Dejiang Shang ◽  
Yan Xiao
Keyword(s):  
Cylindrical Shell ◽  
Free Space ◽  
Acoustic Scattering ◽  
Low Frequency ◽  
Target Strength ◽  
Wave Direction ◽  
Scattering Field ◽  
Simulation Results ◽  
Finite Cylindrical Shell ◽  
Target Locations

Low-frequency acoustic scatterings from a finite cylindrical shell are numerically analyzed by FEM. The simulation results show that the acoustic-scattering field in waveguide has lots of frequency-related sidelobes, while no sidelobes exist in free space at low frequencies. The simulation also indicates that the module value in waveguide can be almost 20 dB larger than that in free space at low frequency, which is caused by the ocean boundaries. We also demonstrate that when the incident wave direction is normal to the target at low frequency, the target strength will be maximum and the distribution of the acoustic-scattering field is axisymmetric about the incident waving direction. Meanwhile, the acoustic-scattering field is also related to the impedance of the seabed, and the change of the impedance makes just a little contribution to the scattering field. Finally, the influence of different target locations is analyzed, including the targets near the sea surface, seabed and the middle region of the ocean waveguide, respectively. From simulation results, it is evident that the distribution of the acoustic-scattering field at low frequency has a little difference, which is smaller than 0.5 dB with various target locations, and the change is frequency and boundary-related.

scholarly journals Low frequency scattering from fish schools: A comparison of two models

2014 ◽  
Author(s):  
Maria P. Raveau ◽  
Christopher Feuillade
Keyword(s):  
Low Frequency ◽  
Fish Schools

Low frequency scattering from fish schools: A comparison of two models

2013 ◽  
Vol 134 (5) ◽  
pp. 3990-3990
Author(s):  
Maria P. Raveau ◽  
Christopher Feuillade
Keyword(s):  
Low Frequency ◽  
Fish Schools
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