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Acoustics of the Seabed as a Poroelastic Medium
This book presents a concise description of the acoustics of ocean sediment acoustics, including the latest developments that address the discrepancies between theoretical models and experimental measurements. This work should be of interest to ocean acoustic engineers and physicists, as well as graduate students and course instructors. The seabed is neither a liquid nor a solid, but a fluid saturated porous material that obeys the wave equations of a poroelastic medium, which are significantly more complicated than the equations of either a liquid or a solid. This volume presents a model of seabed acoustics with input parameters that allow the model to cover a wide range of sediment types. The author includes example reflection and transmission curves which may be used as typical for a range of sediment types. The contents of this book will allow the reader to understand the physical processes involved in the reflection, propagation, and attenuation of sound and shear waves in ocean sediments and to model the acoustic properties for a wide range of applications.
Oceanography and Mine Warfare
Environmental information is important for successful planning and execution of naval operations. A thorough understanding of environmental variability greatly increases the likelihood of mission success. To ensure that naval forces have the most up-to-date capabilities, the Office of Naval Research (ONR) has an extensive environmental research program. This research, to be of greatest use to the warfighter, needs to be directed towards assisting and solving battlefield problems. To increase research community understanding of the operational demands placed on naval operators and to facilitate discussion between these two groups, the National Research Council's (NRC) Ocean Studies Board (OSB...
Ocean Reverberation
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 ...
Distributed Remote Sensing for Naval Undersea Warfare
The widespread availability of quiet, diesel electric submarines and inexpensive mines is posing a growing threat to global access by the U.S. Navy. In response, the Navy has expanded its undersea warfare efforts and put particular emphasis on the potential for new distributed remote sensing (DRS) approaches. To assist with this effort, the former Chief of Naval Operations requested the NRC to conduct an assessment of DRS for naval undersea warfare. This report provides a clear, near-term path by which useful DRS systems can be applied rapidly to pressing naval USW problems, and by which ongoing science and technology efforts can be directed toward the most useful options. The report contains information as described in 5 U.S.C. 552(b) and therefore could not be released to the public in its entirety. The public version consists of the front matter and executive summary.
Poromechanics
This text features 105 papers dealing with the fundamentals and the applications of poromechanics from the Biot conference of 1998, held in Louvain-la-Neuve. Topics include: wave propogation; numerical modelling; identification of poromechanical parameters; and constitutive modelling.
Technology for the United States Navy and Marine Corps., 2000-2035
This study was inspired by the vast transformation over the past decade in the international strategic landscape facing the U.S., and in the missions and perspectives of the U.S. Navy and Marine Corps (N&MC) as implementing arms of U.S. national security strategy. A thorough examination of the impact of advancing technology on the form and capability of the naval forces to the year 2035. Pays specific attention to: info. and electronic warfare, and the use of surveillance assets; mine and submarine warfare; N&MC weaponry in the context of effectiveness on target; and issues in caring for and maximizing effectiveness of N&MC human resources.
