The invited contributions explore the use of acoustics to measure bottom properties and morphology, as well as to probe buried objects within the sediment. Within the water column, sound is applied to imaging of oceanographic features such as currents and tides or monitoring of marine life. Another key theme is the use of sound to solve geometric inverse problems for precise tracking of undersea vehicles.
Audience: This volume should be useful both to the novice seeking an introduction to the field and to advanced researchers interested in the latest developments in acoustic sensing of the ocean environment.
The workshop was sponsored by the Fundação para a Ciêcia e a Tecnologia (Portuguese Foundation for Science and Technology).
The pseudo-Stoneley wave is most sensitive to permeability: both the impedance and the attenuation are controlled by the fluid flow. Also from reflected-wave modes unique estimates for permeability and porosity can be obtained when the reflection coefficients of different reflected modes are combined. In this case the sensitivity to permeability is caused by subsurface heterogeneities generating mesoscopic fluid flow at seismic frequencies. The results of this thesis suggest that estimation of in-situ permeability is feasible, provided detection is carried out with multi-component measurements. The results of this thesis argely affect geotechnical and reservoir engineering practices.
The introductory chapters familiarise the reader with the world of the Antarctic Ice Sheet and its role in the global system, as well as discussing satellite remote sensing and geo-statistical methods at textbook level. Applications include detailed regional studies of 15 outlet glaciers of the inland ice, some of which are currently changing rapidly. Combinations with SAR data facilitate the study of surface structures and flow features.
Despite its state-of-the-art scientific accuracy, the Atlas of Antarctica is not only intended for use by researchers and students in glaciology, geophysics, remote sensing, cartography and Antarctic research, but also informative and enjoyable for any reader interested in the seventh continent. The Atlas is accompanied by a CD-ROM containing all the atlas maps and elevation models – enabling the reader to discover a wealth of fascinating details in Antarctica!
Dr Michael Ainslie is eminently qualified to write this unique book. He has worked on sonar performance modeling problems since 1983. He has written many peer reviewed research articles and conference papers related to sonar performance modeling, making contributions in the fields of sound propagation and detection theory.