{"refrec":{"BRefID":215870,"RR":"<b>Papadakis, J.S.; Hermand, J.-P.; Flouri, E.T.; Meyer, M.</b> (2008). Geoacoustic adjoint-based inversion via the parabolic equation. <i>J. Acoust. Soc. Am. 123(5)</i>: 3511. <a href=\"http://dx.doi.org/10.1121/1.2934411\" target=\"_blank\">dx.doi.org/10.1121/1.2934411</a>","BEntID":207626,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Acoust. Soc. Am. 123(5)</i>: 3511. <a href=\"https://dx.doi.org/10.1121/1.2934411\" target=\"_blank\">https://dx.doi.org/10.1121/1.2934411</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Papadakis, J.S.; Hermand, J.-P.; Flouri, E.T.; Meyer, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Papadakis, J.S. <i>et al.</i>","Englishabstract":"In this paper an analytic method is exhibited for recovering the acoustic parameters of the sub-bottom region in the ocean. The acoustic propagation problem is modeled via the wide angle parabolic equation and the bottom boundary condition used is in the form of a Neumann to Dirichlet or Dirichlet to Neumann map. The sub-bottom region is assumed homogeneous or horizontally stratified with homogeneous layers. The inversion is modeled as an optimal control problem, and the solution is based on the adjoint method. Several cost functions are introduced which make use of the relative amplitude of the observed complex field. 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American Institute of Physics: New York.  ISSN 0001-4966; e-ISSN 1520-8524","StandardTitleSer":"The Journal of the Acoustical Society of America","ISSN":"0001-4966","AbbrevSer":"J. Acoust. Soc. 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