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Full Field Inversion Methods in Ocean and Seismo-Acoustics : Modern Approaches in Geophysics - Orest Diachok

Full Field Inversion Methods in Ocean and Seismo-Acoustics

Modern Approaches in Geophysics

By: Orest Diachok (Editor), Andrea Caiti (Editor), Peter Gerstoft (Editor), Henrik Schmidt (Editor)

Hardcover Published: May 1995
ISBN: 9780792334590
Number Of Pages: 421

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Recent advances in the power of inversion methods, the accuracy of acoustic field prediction codes, and the speed of digital computers have made the full field inversion of ocean and seismic parameters on a large scale a practical possibility. These methods exploit amplitude and phase information detected on hydrophone/geophone arrays, thereby extending traditional inversion schemes based on time of flight measurements. Full field inversion methods provide environmental information by minimising the mismatch between measured and predicted acoustic fields through a global search of possible environmental parameters. Full Field Inversion Methods in Ocean and Seismo-Acoustics is the formal record of a conference held in Italy in June 1994, sponsored by NATO SACLANT Undersea Research Centre. It includes papers by NATO specialists and others. Topics covered include: · speed and accuracy of acoustic field prediction codes · signal processing strategies · global inversion algorithms · search spaces of environmental parameters · environmental stochastic limitations · special purpose computer architectures · measurement geometries · source and receiving sensor technologies.

Model validation for direct and inverse problems (Invited paper)p. 3
Parallelism in ocean acoustic computations (Invited paper)p. 9
Propagation and inversion in complex ocean environments (Invited paper)p. 15
Fast and accurate finite element methods for the numerical prediction of the acoustic fieldp. 21
Direct wave propagation in the frequency domain via the Dirichlet-to-Neumann operator symbolp. 27
Efficient acoustic field computation for estimating geoacoustic bottom parameters using matched-field inversionp. 33
Weakly divergent bundles of rays and their possible use in inverse methods of ocean acousticsp. 39
Parallel implementation of a 3-D range-dependent ray model for replica field generationp. 45
Some improvement of the shortest path ray tracing algorithmp. 51
A three-dimensional, broadband, coupled normal mode sound propagation modeling approachp. 57
Development of an acoustic field predictor in a three-dimensional oceanic environmentp. 63
Three-dimensional sound propagation in an ocean overlaying an elastic bottomp. 69
Parameter estimation theory bounds and the accuracy of full field inversions (Invited paper)p. 79
Physics-imposed resolution and robustness issues in seismo-acoustic parameter inversionp. 85
Statistical approach to ocean acoustic tomography. Cramer-Rao bounds for accuracy of sound-speed field reconstructionp. 91
Statistical formulation of Ray interference and mode acoustic tomography and its potential accuracy evaluationp. 97
Precision and sensitivity of coherent and incoherent inversion methods: a comparative studyp. 103
A sensitivity study for full-field inversion of geoacoustic data with a towed array in shallow waterp. 109
Optimizing environmental parametrization and experimental design for shallow water sound speed inversionp. 115
Iterative full-field inversion using simulated annealingp. 121
A comparative study of two wave-theoretic inversion schemes in ocean acoustic tomographyp. 127
Direct inverse estimation for a fluctuating shallow water environmentp. 133
Null space reduction in the linearized tomographic inversionp. 139
Non-linear inversion of seismic data by successive approximation of model parameter probability distribution functionsp. 147
Experimental confirmation of focalizationp. 153
Estimation of bottom parameters from real data by genetic algorithmsp. 159
Matched field inversion for geoacoustic properties of young ocean crust (Invited paper)p. 165
Determination of the geoacoustical parameters of a sedimentary layer from surface acoustic waves: a neural network approachp. 171
Seafloor parameter estimation: approximating the inverse map through RBF networksp. 177
Feature extraction and classification of underwater acoustic signalsp. 183
Model-based matched filter processing: a broadband approach to shallow-water inversionp. 189
Model-based inversion for a shallow ocean applicationp. 195
A large dynamic range vertical array of acoustic sensors (Invited paper)p. 205
Low-frequency transducer technology in Ukraine (Invited paper)p. 211
Low-frequency sources for ocean acoustic tomographyp. 217
Transducers for low-frequency communicationsp. 223
A low diffraction beam technique for scanning in the shallow oceanp. 229
Forward modeling of the Barents Sea tomography vertical line array data and inversion highlights (Invited paper)p. 237
Long vertical arrays in acoustical sounding of the oceanp. 243
Study of the significance of an improvement in tomography methodology through a joint assessment of arrival angles and timesp. 249
Acoustic modeling and measurements in the Bay of Biscay in a double sofar channelp. 255
A full field inversion method for acoustic tomography of ocean currentsp. 261
Depth variation of acoustic horizontal refraction through a cold-core ocean eddyp. 267
Stochastic bathymetric effects on matched field processingp. 273
Matched-field inversion for source location and equivalent bathymetryp. 279
The inversion kernel in group travel time tomographyp. 285
Travel time inversion of marine seismic data for ocean sound speed reconstructionp. 291
Waveform inversion for geoacoustic parameters of the ocean bottom in shallow water: matched mode methodp. 299
A review of modal inversion methods for inferring geoacoustic properties in shallow water (Invited paper)p. 305
Experimental techniques for bottom parameter inversion in shallow water (Invited paper)p. 311
Global inversion of acoustic field data in shallow water using genetic algorithmsp. 317
Improving the sensitivity of full-field geoacoustic inversion for estimating bottom sound speed profilesp. 323
Modal analysis of data from synthetic aperture arrays in a shallow water waveguide using a non linear multidimensional parametric methodp. 329
Matched field 3-D tomographic inversion (Invited paper)p. 335
Experimental horizontal wave number spectra and implication for full field processingp. 341
Inverting ambient noise in shallow water for the bottom geo-acoustic parameters (Invited paper)p. 347
Inversion and sandy ocean sedimentsp. 353
Bottom parameter estimations in shallow water by means of field inversion methodsp. 359
Influences of sediment variability on broadband acoustic wave propagation in shallow waterp. 365
Shear wave properties from inversion of Scholte wave datap. 371
Full waveform inversion of seismic interface wave datap. 377
Detection of high shear wave velocities in marine sediment by inversion with simulated annealingp. 383
Modeling and inversion of the elasto-dynamic equations (Invited paper)p. 389
Linearized inversion in viscoelastic mediap. 395
Inverting sea bed acoustic parameters from reverberation datap. 401
List of participantsp. 407
Indexp. 417
Table of Contents provided by Blackwell. All Rights Reserved.

ISBN: 9780792334590
ISBN-10: 0792334590
Series: Modern Approaches in Geophysics
Audience: General
Format: Hardcover
Language: English
Number Of Pages: 421
Published: May 1995
Country of Publication: NL
Dimensions (cm): 23.11 x 15.49  x 3.05
Weight (kg): 0.75

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