NICOP - Stochastic variability of fish school scattering and attenuation fluctuationeffects based on collective animal behavior modeling
Abstract
The research proposed here is specifically aimed at addressing current issues resulting from spatial and temporal fluctuations in SO"NAR reverberation and attenuation produced by large aggregations of schooling fish, in order to optimize SONAR target detection and" identification applications.Schools of swim bladder fish frequently exhibit large spatial and temporal variations in fish density" and distribution, as well in the school shape. At near-resonance frequencies, multiple scattering between fish, and interference in""teractions of their scattered fields, combine to produce a medium within the fish school which profoundly affects acoustic attenuati""on and scattering, and their spatio-temporal variability.An effective approach to this problem is available through self-consistent"" mathematical techniques. The formalism used is based upon the solution of sets of coupled differential equations, and incorporates" a verified swim bladder scattering kernel for an individual fish. This approach has been shown to provide accurate predictions of t"he ensemble properties, such as transmission and attenuation through, as well as scattering from, schools of swim bladder fish.This" research is directed towards achieving a better understanding of the physical reasons for stochastic variations in fish school scat"tering and attenuation, and target strength; and aims to achieve an accurate statistical characterization of these objects. It imple"ments a new dynamic fish school behavioral model for achieving this end. This work would foster the improvement of propagation/rever"beration codes used by the Navy, by incorporating boundary-interference effects and oceanographic variability.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 20, 2017
- Source ID
- N629091812016
Entities
People
- Christopher Feuillade
Organizations
- Office of Naval Research
- Pontifical Catholic University of Chile
- United States Navy