Ultrasonic studies of liquid/solid seimoacoustic wave phenomena
Abstract
New ultrasonic modeling findings are presented contributing to ten fundamental problems related to low-frequency seismoacoustic wave phenomena resulting from the interaction of underwater acoustic waves with heterogeneous elastic boundaries such as the ice cover and/or ocean bottom. The results are described in ten independent sections covering the following problems: (1) backscattering of Scholte waves and grazing underwater acoustic waves by a trench at a liquid/solid interface; (2) explanation for observed underwater acoustic backscatter from the Canada Basin near 73.2 deg N, 139 deg W where recent bathymetric charts do not reveal the existence of large bathymetric highs nearby; (3) effect of a thin low-velocity layer underneath a floating plate on flexural wave dispersion; (4) effect of viscous waves from suspended particles in a thin layer under sea ice on low-frequency underwater acoustic wave reflectivity; (5) comparison of experimental and theoretical results on the dispersion of antisymmetric edge waves along apex of truncated elastic wedge; (6) wave propagation along apex of free and immersed elastic wedge with range-dependent apex angle and cross section; (7) shear wave coupling to ice cores; (8) ultrasonic characterization of sea ice cores; (9) monostatic seismic profiling using scattering from 45 deg oblique cylindrical hole in ice plate using one compressional transducer; and (10) sea ice finger-rafting and ice thickness.
- Publication:
-
Final Report
- Pub Date:
- November 1994
- Bibcode:
- 1994saur.rept.....C
- Keywords:
-
- Backscattering;
- Bathymeters;
- Charts;
- Floating;
- Heterogeneity;
- Ice;
- Low Frequencies;
- Low Speed;
- Ocean Bottom;
- Sound Waves;
- Underwater Acoustics;
- Wave Dispersion;
- Holes (Mechanics);
- Reflectance;
- S Waves;
- Scattering;
- Transducers;
- Wave Propagation;
- Acoustics