This volume contains the collection of papers from the second workshop on Experimental Acoustic Inversion Techniques for Exploration of the Shallow Water Environment. Acoustic techniques provide the most effective means for remote sensing of ocean and sea floor processes, and for probing the structure beneath the sea floor. No other energy propagates as efficiently in the ocean: radio waves and visible light are severely limited in range because the ocean is a highly conductive medium. However, sound from breaking waves and coastal shipping can be heard throughout the ocean, and marine mammals communicate acoustically over basin scale distances. The papers in this book indicate a high level of research interest that has generated significant progress in development and application of experimental acoustic inversion techniques. The applications span a broad scope in geosciences, from geophysical, biological and even geochemical research. The list includes: estimation of geotechnical properties of sea bed materials; navigation and mapping of the sea floor; fisheries, aquaculture and sea bed habitat assessment; monitoring of marine mammals; sediment transport; and investigation of natural geohazards in marine sediments. Audience This book is primarily intended for physicists and engineers working in underwater acoustics and oceanic engineering. It will also be of interest to marine biologists, geophysicists and oceanographers as potential users of the methodologies and techniques described in the book contributions.

InhaltsangabeOn the assessment of geoacoustic parameters in shallow water environments / Jean-Claude Le Gac, Yann Stéphan, Thierry Garlan, N. Weber.- Bayesian inversion of seabed reflection data / Stan E. Dosso, Charles W. Holland- Backpropagation techniques in ocean acoustic inversion: time reversal, retrogation and adjoint modelling - a review / Matthias Meyer, Jean-Pierre Hermand.- Acoustic inversion at low kHz frequencies using an active, vertical line array / Paul C. Hines, Matt Coffin.- Dispersion of broadband acoustic normal modes in the context of long range sediment tomography / Gopu Potty, James Miller- Characterization of local seabed properties using synthetized horizontal array data / Peter L. Nielsen, Mark Fallat, Christopher Harrison.- Characterization of a range-dependent environment from towed array data / Mark Fallat, Peter Nielsen, Stan E. Dosso, Martin Siderius.- Accounting for bias in horizontal wavenumber estimates due to source motion / Kyle M. Becker.- Acoustic clutter from buried submarine mud volcanoes / Charles W. Holland, Anthony L. Gerig, Piero Boni.- Nonlinear acoustical methods in the detection of gassy sediments / Jaroslaw Tegowski, Zygmunt Klusek, Jaromir Jakacki.- Acoustic scattering from submerged and buried objects / Ilkka Karasalo, Patrik Skogqvist.- High-frequency bistatic scattering experiments using proud and buried targets / Philippe Blondel, Peter F. Dobbins, Nic Jayasundere, Mario Cosci.- A sediment probe for the rapid assessment of seabed characteristics / John Osler, Arnold Furlong, Harold Christian.- Continuous acoustic monitoring of physiological and environmental processes in seagrass prairies with focus on photosynthesis / Jean-Pierre Hermand.- Shallow water tomography in a highly variable scenario / Cristiano Soares, Sergio M. Jesus, Emanuel Coelho.- Inversions of reflection loss measumements of a smooth water/sand interface / Marcia J. Isakson, Tracianne Neilsen, AndrewWorley.-Estimation of transmission loss and its uncertainty / Peter Gerstoft, Chen-Fen Huang, William Hodgkiss.- A forward model for geoacoustic inversion based on ray tracing and plane-wave refection coefficients / Jens M. Hovem, Hefeng Dong, Xiukun Li.- Inversion of the propeller harmonics from a light aircraft for the geoacoustic properties of marine sediments / Michael J. Buckingham, Eric M. Giddens, Fernardo Simonet.- Inversion of shallow water ambient noise data by means of differential evolution as a global search method / Dick G. Simons, Camiel van Moll, Chris H. Harrison.- Reflection Loss and Sub-bottom Profiling with Ambient Noise / Chris Harrison.- Inversion of geoacoustic model parameters using ship radiated noise / Ross N. Chapman, Reza M. Dizaji, R. Lyn Kirlin.- Matched-field processing of humpback whale song off eastern Australia / Aaron Thode, Peter Gerstoft, Melanie Guerra, M. Dale Stokes, Michael Noad, Douglas Cato.- Inversions of horizontal and vertical line array data for the estimation of geoacoustic model parameters / Dag Tollefsen, Michael J. Wilmut, Ross N. Chapman.- Issues of enrironment variability in inverse problems in ocean acoustics / David P. Knobles, M. Gray, Robert A. Koch, Adam Cook