• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Applied Ocean Physics and Engineering (AOP&E)
    • View Item
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Applied Ocean Physics and Engineering (AOP&E)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Sound scattering by several zooplankton groups. II. Scattering models

    Thumbnail
    View/Open
    JASA_Stanton-1998a.pdf (355.5Kb)
    Date
    1998-01
    Author
    Stanton, Timothy K.  Concept link
    Chu, Dezhang  Concept link
    Wiebe, Peter H.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/2515
    As published
    https://doi.org/10.1121/1.421110
    DOI
    10.1121/1.421110
    Keyword
     Backscatter; Acoustic wave scattering; Bioacoustics 
    Abstract
    Mathematical scattering models are derived and compared with data from zooplankton from several gross anatomical groups—fluidlike, elastic shelled, and gas bearing. The models are based upon the acoustically inferred boundary conditions determined from laboratory backscattering data presented in part I of this series [Stanton et al., J. Acoust. Soc. Am. 103, 225–235 (1998)]. The models use a combination of ray theory, modal-series solution, and distorted wave Born approximation (DWBA). The formulations, which are inherently approximate, are designed to include only the dominant scattering mechanisms as determined from the experiments. The models for the fluidlike animals (euphausiids in this case) ranged from the simplest case involving two rays, which could qualitatively describe the structure of target strength versus frequency for single pings, to the most complex case involving a rough inhomogeneous asymmetrically tapered bent cylinder using the DWBA-based formulation which could predict echo levels over all angles of incidence (including the difficult region of end-on incidence). The model for the elastic shelled body (gastropods in this case) involved development of an analytical model which takes into account irregularities and discontinuities of the shell. The model for gas-bearing animals (siphonophores) is a hybrid model which is composed of the summation of the exact solution to the gas sphere and the approximate DWBA-based formulation for arbitrarily shaped fluidlike bodies. There is also a simplified ray-based model for the siphonophore. The models are applied to data involving single pings, ping-to-ping variability, and echoes averaged over many pings. There is reasonable qualitative agreement between the predictions and single ping data, and reasonable quantitative agreement between the predictions and variability and averages of echo data.
    Description
    Author Posting. © Acoustical Society of America, 1998. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 103 (1998): 236-253, doi:10.1121/1.421110.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Biology
    Suggested Citation
    Journal of the Acoustical Society of America 103 (1998): 236-253
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      Differences between sound scattering by weakly scattering spheres and finite-length cylinders with applications to sound scattering by zooplankton 

      Stanton, Timothy K.; Wiebe, Peter H.; Chu, Dezhang (Acoustical Society of America, 1998-01)
      A modeling study was conducted to determine the conditions under which fluidlike zooplankton of the same volume but different shapes (spherical/cylindrical) have similar or dramatically different scattering properties. ...
    • Thumbnail

      Sound scattering by several zooplankton groups. I. Experimental determination of dominant scattering mechanisms 

      Stanton, Timothy K.; Chu, Dezhang; Wiebe, Peter H.; Martin, Linda V.; Eastwood, Robert L. (Acoustical Society of America, 1998-01)
      The acoustic scattering properties of live individual zooplankton from several gross anatomical groups have been investigated. The groups involve (1) euphausiids (Meganyctiphanes norvegica) whose bodies behave acoustically ...
    • Thumbnail

      A phase-compensated distorted wave Born approximation representation of the bistatic scattering by weakly scattering objects : application to zooplankton 

      Chu, Dezhang; Ye, Zhen (Acoustical Society of America, 1999-10)
      The distorted wave Born approximation (DWBA) method has been successfully used in modeling the acoustic backscattering by weakly scattering zooplankton [Stanton et al., J. Acoust. Soc. Am. 94, 3463–3472 (1993), Wiebe et ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo