Ocean Reverberation

1. Front Matter

   Pages i-xii

   PDF

2. Scattering Mechanisms

   1. Front Matter

      Pages 1-1

      PDF

   2. Sea Surface Reverberation

      • Suzanne T. McDaniel

      Pages 3-10

   3. Properties of Bubble Distributions Relevant to Surface Reverberation

      • David M. Farmer

      Pages 11-24

   4. Sound Scattering from Microbubble Distributions Near the Sea Surface

      • William M. Carey, Ronald A. Roy

      Pages 25-43

   5. Theoretical Modeling of Low Frequency Acoustic Scattering from Subsurface Bubble Structures

      • R. F. Gragg, D. Wurmser

      Pages 45-50

   6. Discrete Backscatter Can be Dominant in Rough Bottom Reverberation

      • Ira Dyer, Arthur B. Baggeroer, Henrik Schmidt, J. Robert Fricke, Nazan Ozluer, Dominique Giannoni

      Pages 51-57

   7. Sea-Bottom Reverberation: The Role of Volume Inhomogeneities of the Sediment

      • M. Gensane

      Pages 59-64

   8. The Perturbation Characterization of Ocean Reverberations

      • E. Y. T. Kuo

      Pages 65-70

   9. The Reduction of Surface Backscatter and Ambient Noise by Monomolecular Films on the Ocean Surface

      • Jim Rohr, Robert Kolesar, Frank Ryan

      Pages 71-76

3. High Frequency Measurements and Mechanisms

   1. Front Matter

      Pages 77-77

      PDF

   2. High Frequency Acoustic Bottom Backscatter Mechanisms at Shallow Grazing Angles

      • Nicholas P. Chotiros

      Pages 79-84

   3. Measurements of High Frequency Reverberation in Shallow Water

      • J. G. Kelly, R. N. Carpenter, M. Buffman, E. R. Levine

      Pages 85-90

   4. Frequency Response Measurements on Backscattering from a Shallow Sea Floor, Using a Parametric Source

      • T. G. Muir, L. A. Thompson, J. A. Shooter, T. E. DeMary, R. J. Wyber

      Pages 91-96

   5. Measurements of Acoustic Backscattering of the Near-Surface Layer

      • Bernd Nützel, Heinz Herwig

      Pages 97-102

4. Reverberation Modelling

   1. Front Matter

      Pages 103-103

      PDF

   2. Numerical Modeling of Three-Dimensional Reverberation from Bottom Facets

      • Henrik Schmidt

      Pages 105-112

   3. Numerical Simulations of Lower-Frequency Acoustic Propagation and Backscatter from Solitary Internal Waves in a Shallow Water Environment

      • Stanley A. Chin-Bing, David B. King, Joseph E. Murphy

      Pages 113-118

   4. Reverberation Modeling with the Two-Way Parabolic Equation

      • M. D. Collins, G. J. Orris, W. A. Kuperman

      Pages 119-124

   5. Calculations of Ocean Bottom and Sub-Bottom Backscattering Using a Time-Domain Finite-Difference Code

      • Dale D. Ellis, Nikolaos A. Kampanis, Ralph A. Stephen

      Pages 125-130

During the past decade there has been a renewed interest in active sonar systems at both low and medium frequencies. More recently this interest has been extended to very high frequencies in shallow water. Reverberation often limits the detection performance of these systems, and there is a need to understand the underlying mechanisms that cause the scattering. With more emphasis being given to reverberation phenomena in the Scientific Program of Work at the SACLANT Undersea Research Centre, it was considered an opportune time to host a meeting, bringing together scientists from NATO countries to foster cross-disciplinary dialogue and generate ideas for new research directions. Consequently the Ocean Reverberation Symposium was held 25-29 May 1992 in La Spezia, Italy. Over 60 presentations were made on a diverse selection of topics, of which ten papers will be published as a SACLANTCEN Conference Proceedings. The papers in this volume are grouped into 8 sections, usually in the same order as presented at the corresponding session of the Symposium: Section 1 - Scattering Mechanisms Section 2 - High Frequency Measurements and Mechanisms Section 3 - Reverberation Modelling Section 4 - ARSRP Mid-Atlantic Ridge Experiment Section 5 - Low Frequency Measurements Section 6 - Volume Scattering Section 7 - Signal Processing Issues Section 8 - Applications Taken together the papers show some emerging trends in the research.

• detection
• extraction
• information
• measurement
• mechanism
• mechanisms
• modeling
• modelling
• ocean
• processing
• research
• scattering
• signal
• signal processing
• tracking
• remote sensing/photogrammetry

• SACLANT Undersea Research Centre, La Spezia, Italy

  Dale D. Ellis, John R. Preston, Heinz G. Urban

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