Mathematical Modeling of Space-Time Variations in Acoustic Transmission and Scattering from Schools of Swim Bladder Fish (FY11 Annual Report)
PONTIFICIA UNIVERSIDAD CATOLICA DE CHILE SANTIAGO FACULTAD DE FISICA
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The goal is the development of a time-domain acoustical method for investigating the spatial and temporal stochastic variations in fish density within fish schools, and thereby study the statistical fluctuations in the scattering of sound from these objects. The objective of this research is to develop a complete time-domain theory of acoustic scattering from, and propagation through, schools of swim bladder fish at and near the swim bladder resonance frequency, including multiple scattering and coherent interaction effects between the individual fish. This should then lead to a prescriptive capability for modeling the evolution of sound pulses as they are scattered from, and pass through, fish schools. Subsequently, it should be possible to identify discrete segments of the signal with different sections of the fish school, and enable an enhanced understanding of signal scattering, and extinction, by the school, and the fluctuations in these properties.