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 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 Encyclopedia of Remote Sensing written by Eni Njoku and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This first encyclopaedic reference on remote sensing describes the concepts, techniques, instrumentation, data analysis, interpretation, and applications of remote sensing, both airborne and space-based. Scientists, engineers, academics, and students can quickly access answers to their reference questions and direction for further study.
Download or read book Internal Gravity Waves in the Shallow Seas written by Stanisław R. Massel and published by Springer. This book was released on 2015-07-07 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a comprehensive study of the internal ocean waves, which play a very important role in ocean physics providing mechanisms for ocean water mixing and circulation, as well as the transportation of gases, nutrients, and a very large number of marine organisms in the ocean body. In contrast to surface waves, the literature on internal waves is not so numerous, mainly due to the difficulties in experimental data collection and in the mathematical description of internal wave propagation. In this book, the basic mathematical principles, a physical description of the observed phenomena, and practical theoretical methods of determination of wave parameters as well as the original method of observation using moving sensors are presented. Special attention is paid to internal wave propagation over changing bottom topographies in shallow seas such as the Baltic Sea. The book is supplemented with an extended list of relevant and extended bibliographies, a subject index, and an author index.
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 Internal Gravity Waves written by Bruce R. Sutherland and published by Cambridge University Press. This book was released on 2010-09-02 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of internal gravity waves provides many challenges: they move along interfaces as well as in fully three-dimensional space, at relatively fast temporal and small spatial scales, making them difficult to observe and resolve in weather and climate models. Solving the equations describing their evolution poses various mathematical challenges associated with singular boundary value problems and large amplitude dynamics. This book provides the first comprehensive treatment of the theory for small and large amplitude internal gravity waves. Over 120 schematics, numerical simulations and laboratory images illustrate the theory and mathematical techniques, and 130 exercises enable the reader to apply their understanding of the theory. This is an invaluable single resource for academic researchers and graduate students studying the motion of waves within the atmosphere and ocean, and also mathematicians, physicists and engineers interested in the properties of propagating, growing and breaking waves.
Download or read book Arctic Internal Waves Experiment AIWEX Hydrographic Data March 24 April 25 1985 written by George Cameron Anderson and published by . This book was released on 1990 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Internal Gravity Waves written by Bruce Sutherland and published by Cambridge University Press. This book was released on 2010-09-02 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive treatment of the theory for small and large amplitude internal gravity waves, with illustrative examples and exercises.
Download or read book Nonlinear Internal Waves in Lakes written by Kolumban Hutter and published by Springer Science & Business Media. This book was released on 2011-11-25 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal wave dynamics in lakes (and oceans) is an important physical component of geophysical fluid mechanics of ‘quiescent’ water bodies of the Globe. The formation of internal waves requires seasonal stratification of the water bodies and generation by (primarily) wind forces. Because they propagate in basins of variable depth, a generated wave field often experiences transformation from large basin-wide scales to smaller scales. As long as this fission is hydrodynamically stable, nothing dramatic will happen. However, if vertical density gradients and shearing of the horizontal currents in the metalimnion combine to a Richardson number sufficiently small (
Download or read book Internal Gravity Waves in the Ocean written by Jo Roberts and published by . This book was released on 1975 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Internal Gravity Waves in the Ocean written by Yu.Z. Miropol'sky and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph creates a systematic interpretation of the theoretical and the most actual experimental aspects of the internal wave dynamics in the ocean. Firstly, it draws attention to the important physical effects from an oceanographical point of view which are presented in mathematical descriptions. Secondly, the book serves as an introduction to the range of modern ideas and the methods in the study of wave processes in dispersive media. The book is meant for specialists in physics of the ocean, oceanography, geophysics, hydroacoustics.
Download or read book Oceanic Internal Waves from Ship Aircraft and Spacecraft written by John R. Proni and published by . This book was released on 1974 with total page 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 Laboratory experiments and numerical simulations of inertial waves in a rotating spherical shell written by Sandy Dahley and published by Cuvillier Verlag. This book was released on 2016-02-01 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geo- und astrophysikalisch motivierte Strömungen, wie sie in der Atmosphäre, in den Ozeanen oder im Inneren von Planeten auftreten, lassen sich in rotierenden Experimenten mit homogenen Fluiden untersuchen. In dieser Arbeit werden Untersuchungen zu Trägheitswellen und Wellenattraktoren in einer Kugelschale und einem rechteckigen Tank gezeigt. Viele geophysikalische Anwendungen mit planetaren Skalen motivieren den Einsatz von sphärischen Geometrien. Mit dem Kugelspaltexperiment, bestehend aus zwei rotierenden konzentrisch angeordneten Kugelschalen, werden die Anregung und Ausbildung verschiedener Wellenphänomene sowie der internen Grenzschichten untersucht. Durch eine Modulation der Rotationsgeschwindigkeit an der Innenkugel in Form einer Sinuskurve werden Wellen erzeugt, die an den gekrümmten Rändern des Modells mehrfach reflektiert werden und somit bestimmten Bahnen folgen. Für den Vergleich mit numerischen Untersuchungen werden unterschiedliche Visualisierungen und Messtechniken spezifiziert. Die numerische Simulation erlaubt dabei die Untersuchung in Parameterbereichen mit Instabilitäten, die für die experimentelle Untersuchung schwer zugänglich sind.
Download or read book Dynamics of Internal Gravity Waves in the Ocean written by Yu.Z. Miropol'sky and published by Springer Science & Business Media. This book was released on 2001-04-30 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph creates a systematic interpretation of the theoretical and the most actual experimental aspects of the internal wave dynamics in the ocean. Firstly, it draws attention to the important physical effects from an oceanographical point of view which are presented in mathematical descriptions. Secondly, the book serves as an introduction to the range of modern ideas and the methods in the study of wave processes in dispersive media. The book is meant for specialists in physics of the ocean, oceanography, geophysics, hydroacoustics.
Download or read book Internal Waves in the SESAME II Experiment Speed Direction and Effect on Acoustic Transmission written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SESAME II experiment was conducted off the northwestern coast of Scotland in July-August 1996. Three vertical arrays (named 'the deep array, ' the shallow array, ' and 'the temperature array') containing thermal sensors and hydrophones were deployed. An analysis of temperature and sound speed data from the experiment over a 5 days span reveals that the relatively long period variations can be identified with the M2 tidal cycles (principal lunar tides with period 12.42 h). Short period events (of about 10 min duration) on the shallow array are usually accompanied by similar, though not identical, events on the temperature array, delayed by 2-10 min. Such correspondence was found to be rare between the deep array and the shallow array. The time delays correspond to a range of internal wave (IW) speeds of 0.15-0.35 m/s. During the 5 days period, a search for prominent short-period events (soliton-like events) in which the isospeed contour dips from a depth of about 50 m to a depth of over 120 m on both arrays, reveals several candidates at days 215.35, 217.6, 218.65, 218.97, 219.48, 219.6, and 219.74. Among these, the event at day 217.6 seems closest to being soliton-like because it retained its shape more perfectly than others while traveling from the shallow array to the temperature array. Assuming its direction (the wave vector direction) to be approximately toward southeast with compass angle 105 deg (the average value obtained from analysis of current-meter data), its speed would be 0.3 m/s, in excellent agreement with the value of 0.35 m/s, also obtained from current-meter data. During the middle period of this soliton-like event, the sound speed profile has been found to possess approximately constant gradient. According to a well known theorem, such a constant gradient sound speed profile should cause refraction of the sound energy passing through the IW.
