Download or read book Experimental Study of Ship Generated Internal Waves and Associated Phenomena written by Huamin Ma and published by . This book was released on 1993 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical and Experimental Study of Internal Waves Generated by a Density Current Down a Sloping Bottom written by Michael Yachnis and published by . This book was released on 1968 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Ship Generated Water Waves written by P. C. Helwig and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Internal Waves from Ship Aircraft and Spacecraft written by Atlantic Oceanographic and Meteorological Laboratories. Ocean Remote Sensing Laboratory and published by . This book was released on 1978 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ocean Remote Sensing Laboratory (ORSL) has been studying internal waves using remote sensing techniques employing three different types of observational platforms: ships, aircraft, and spacecraft. Internal waves and their manifestations have been observed using the following techniques: Satellite multispectral scanning imagers (principally in the visible and near-infrared); Radar--both coherent imaging radar and standard meteorological radar (all from aircraft); Hand-held visible photography (from spacecraft, aircraft, and ship; Ship-towed thermistors; and STD and XBT casts.
Download or read book Oceanic Internal Waves from Ship Aircraft and Spacecraft written by Atlantic Oceanographic and Meteorological Laboratory. Ocean Remote Sensing Laboratory and published by . This book was released on 1978 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Qualitative Study of Internal Wave Ship Wakes written by and published by . This book was released on 1995 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the past several years the UK-US Radar Ocean Imaging Program has conducted a series of field experiments with the primary purpose of gathering real aperture radar (RAR) imagery at low grazing angle of ship-generated internal wave (IW) wakes. The first observations with RAR's were made in the 1989 Loch Linnhe experiment where it was observed that radar images at low grazing angles (LGA) of approximately six degrees had significantly higher modulation levels than SAR images made at higher grazing angles of 35 - 65 degrees. These initial observations have led to several more experiments designed to verify the phenomenon and to test its dependence on experimental and environmental conditions. A parallel effort began to develop theoretical models of the LGA imaging process. Through this series of experiments we have developed an extensive database of radar imagery and supporting environmental data. The objective of this report is twofold: (1) To describe the database and the associated space of parameters. We will look at the coverage of the parameter space within the database and at areas which should be covered. (2) To take an initial look at the dependence of qualitative modulation strength on the experimental and environmental parameters. This first look will indicate the strongest dependencies which can then be studied in more detail. Section 2 describes the experimental database and Section 3 discusses the parameter space, image quality, and their relationships based on the images in the database. In Section 4 we summarize our conclusions and make recommendations for both future analyses and experiments.
Download or read book Laboratory Investigation of Internal Wave Generation Models written by Lon E. Hachmeister and published by . This book was released on 1975 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous theoretical research shows that surface tides transfer energy to internal waves at continental shelf breaks. In an experimental study of the structure of the internal wave energy generated in this region, the authors allow a shallow water surface wave propagating on a linearly stratified fluid to interact with various continental terrace models. The experiments show that the internal wave energy produced both at the shelf-break and along the surface of the continental slope propagates away from the continental terrace in the form of beams of internal waves.
Download or read book Experiments on Internal Waves written by Prajvala Kishore Kurtakoti and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal waves are present both in the atmosphere and the oceans. Internal waves transport momentum across long distances and their breaking provides energy for mixing. The mechanisms of internal wave dissipation and breaking is not completely understood. We are interested in understanding how internal waves propagate and reflect off sloping topography such as the continental shelf and dissipation. We conducted a series of laboratory experiments to study the energy flux of propagating and reflecting mode-1 vertically trapped internal waves in a linearly stratified salt water fluid. The internal waves are generated by a wave generator that is capable of producing monochromatic vertical mode-1 internal waves. In our experiments, we record a video in a rectangular section of the tank where these waves propagate along the length of the tank (5m) and reflect back. We repeated this for 3 different types of end wall boundary conditions : no slope, supercritical slope and subcritical slope. Their quantitative measurements of the structure and amplitude of the internal waves are measured using an optical technique called synthetic schlieren from which we can extract the energy flux of the wave. We use a complex demodulation function called the Hilbert transform to filter out internal waves on the basis of the sign of their wave vector. We employ this technique to filter out the generated waves that are travelling left to right from their reflection that are travelling right to left. From the filtered data we can understand how much energy from incoming waves is present in reflected internal waves and how internal waves dissipate across experiments from all the cases and across different wave generator amplitudes. The analysis of energy flux of internal waves during propagation and reflection using Hilbert transform is helpful as it brings insight into phenomena that are difficult to observe during field studies. Comparison between the reflected energy efficiency across the 3 types of experiments improves our understanding of how waves reflect from different end boundaries, and also sheds light on the how dissipation changes when we change wave generator amplitude.
Download or read book Experimental and Theoretical Study of Internal Waves Generated by the Collapse of a Two Dimensional Mixed Region in a Density Gradient written by Defence Research Establishment Pacific and published by . This book was released on 1972 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observation of High Frequency Internal Waves in the Pacific Ocean written by Robert Libman Zalkan and published by . This book was released on 1968 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations of high frequency internal waves were made from 1 to 14 December 1966, in the deep sea off Baja, California. The fluctuations of the depth of an isotherm were measured with a three-element horizontal array attached to a stable platform. The waves are characterized as a broad band phenomenon with a continuous distribution in frequency. For short intervals of time, a narrow frequency band within the continuum is adequately described as a horizontally plane wave of a single vertical mode. Furthermore, this simplified structure is stationary over time spans of several days. High modes are present in the low frequency waves. Above 4 cycles per hour, however, the first mode predominates. The spectral shape is consistent with the shear limited equilibrium spectrum proposed by Phillips (1966). In addition, the predominance of the first mode at high frequencies further emphasizes the importance of shear instability in internal wave propagation. The horizontal properties of the wave field indicate well-defined directions of narrow-band propagation. These directions and the dispersive properties of the propagation have led to the identification of local topographic features in generating areas of internal waves. (Author).
Download or read book Experimental and Theoretical Study of Internal Waves Generated by the Collapse of a Two Dimensional Mixed Region in a Density Gradient written by Defence Research Establishment Pacific and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Research written by and published by . This book was released on 1969 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Twenty Second Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2000-03-02 with total page 1039 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.
Download or read book An Experimental Investigation of Interfacial Waves Generated by Low Frequency Internal Waves written by Ivan Bei Chou and published by . This book was released on 1975 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the density transition layer between salt and fresh water high frequency interfacial waves can be generated by the shear stresses created by finite amplitude internal waves at this interface. The conditions under which these waves occur are experimentally investigated in this thesis. Instantaneous Richardson number profiles at the crests and troughs of the finite amplitude internal waves were measured. The low frequency waves were mechanically generated by a hydraulically driven horizontal diaphragm. The experiments were performed in an internal wave facility with a test section eighty feet long, four feet high and two feed wide. (Author).
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Internal Waves in the Sea written by Owen S. Lee and published by . This book was released on 1965 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal waves exist in the ocean as a rule rather than an exception. Energy is transported by them in channels that are similar to sound channels. Their effect on naval exercises and equipment, particularly functions involving the use of underwater sound, can be expected to be more pronounced in these channels. Although theory and observation are still not adequate for a full understanding of the phenomenon, western literature prior to June 1963 contains more than 300 publications dealing with internal waves in the atmosphere, lakes, and seas. These publications are listed in the comprehensive bibliography which is part of this report. (Author).
Download or read book Laboratory and Numerical Studies of Internal Wave Generation and Propagation in the Ocean written by Benjamin Thomas King and published by . This book was released on 2010 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal waves are generated in the ocean by oscillating tidal flow over bottom topography such as ridges, seamounts, and continental slopes. They are similar to the more familiar surface waves, but not being constrained to move on the surface, propagate throughout the bulk of the world oceans. Internal waves transmit energy over thousands of kilometers, ultimately breaking and releasing their energy into turbulence and mixing. Where these internal waves are generated, as well as where and how they break and cause mixing, has important effects on the general circulation of the ocean, which is in turn a major component in earth's climate. As a first step in a more thorough understanding of the evolution of internal waves in the ocean, it is important to characterize their generation. The two-dimensional generation problem has been studied for four decades, with ample experimental, numerical, and theoretical results. Most of this past work has also been done using linear, inviscid approximations. However, wave generation in the ocean is three-dimensional (3D), and in many locations, nonlinear and viscous effects can be significant. Recent advances in experimental and numerical techniques are only now making the fully nonlinear, 3D generation process accessible. We utilize these new techniques to perform both laboratory experiments and numerical simulations on internal wave generation in 3D. We find that a significant component of the internal wave field generated by tidal flow over 3D topography is radiated in the direction perpendicular to the tidal forcing direction. This could lead to substantial improvements of global internal wave generation models. In addition, we have developed a new method for statistical analysis of ocean data sets, and have found large regions in the deep ocean where internal waves may not propagate. This will also have important effects on the way researchers study the propagation of internal waves, which, when propagating downward, were previously thought to always reflect from the sea floor.
