Download or read book An Experimental Investigation of Low mode Internal Wave Generation and Interaction with Shelf Topography written by Abigail Clarke Mitchell and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of laboratory experiments were performed to examine the generation of low-mode internal waves and their interaction with an idealized continental shelf/slope topography. A tunable wave generator was utilized to produce a high-quality mode-1 wave field in a linearly stratified fluid. Modal analysis results indicate the generation of a high-quality mode-1 wave which transforms into higher modes as the wave interacts with the topography. The wave-slope interactions produced a range of responses including the formation of upslope-surging internal boluses that propagated across the shelf flat. Bolus formation was primarily dependent on the wave Froude number and the ratio of the topographic slope to the internal wave characteristic slope. Boundary layer thickness and finite water depth are also shown to effect bolus formation and propagation. These results compare well to the two-dimensional numerical simulations of Venayagamoorthy and Fringer (2007) with some deviations which may be attributable to the effects of the three-dimensionality of these experiments. Comparisons are also made to experiments (Moore et al., 2015, JFM in review) performed in a two-layer stratification where internal boluses were observed.
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 Internal Wave Generation Over Rough Sloped Topography written by Lauren E. Eberly and published by . This book was released on 2012 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal waves exist everywhere in stratified fluids - fluids whose density changes with depth. The two largest bodies of stratified fluid are the atmosphere and ocean. Internal waves are generated from a variety of mechanisms. One common mechanism is wind forcing over re- peated sinusoidal topography, like a series of hills. When modeling these waves, linear theory has been employed due to its ease and low computational cost. However, recent research has shown that non-linear effects, such as boundary layer separation, may have a dramatic impact on wave generation. This research has consisted of experimentation on sloped, sinusoidal hills. As of yet, no experimental research has been done to characterize internal wave generation when repeated sinusoidal hills lie on a sloped surface such as a continental slope or a foothill. In order to perform this experiment, a laboratory was built which employed the synthetic schlieren method of wave visualization. Measurements were taken to find wind speed, boundary layer thickness, and density perturbation. From these data, an analysis was performed on wave propagation angle, wave am- plitude, and pressure drag. The result of the analysis shows that when wind blows across a series of sloped sinusoidal hills, fluid becomes trapped in the troughs of the hills resulting in a lower apparent forcing amplitude. The generated waves contain less energy than linear predictions. Ad- ditionally, the sloped hills produce waves which propagate at an angle away from the viewer. A necessary correction, which shifts from the reference frame of the observer to the reference plane of the waves is described. When this correction is applied, it is shown that linear theory may only be applied for low Froude numbers. At high Froude numbers, the effect of the boundary layer is great enough that the wave characteristics deviate significantly from linear theory predictions. The analyzed data agrees well with previous studies which show a similar deviation from linear theory.
Download or read book Ocean Mixing written by Michael Meredith and published by Elsevier. This book was released on 2021-09-16 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean Mixing: Drivers, Mechanisms and Impacts presents a broad panorama of one of the most rapidly-developing areas of marine science. It highlights the state-of-the-art concerning knowledge of the causes of ocean mixing, and a perspective on the implications for ocean circulation, climate, biogeochemistry and the marine ecosystem. This edited volume places a particular emphasis on elucidating the key future questions relating to ocean mixing, and emerging ideas and activities to address them, including innovative technology developments and advances in methodology. Ocean Mixing is a key reference for those entering the field, and for those seeking a comprehensive overview of how the key current issues are being addressed and what the priorities for future research are. Each chapter is written by established leaders in ocean mixing research; the volume is thus suitable for those seeking specific detailed information on sub-topics, as well as those seeking a broad synopsis of current understanding. It provides useful ammunition for those pursuing funding for specific future research campaigns, by being an authoritative source concerning key scientific goals in the short, medium and long term. Additionally, the chapters contain bespoke and informative graphics that can be used in teaching and science communication to convey the complex concepts and phenomena in easily accessible ways. - Presents a coherent overview of the state-of-the-art research concerning ocean mixing - Provides an in-depth discussion of how ocean mixing impacts all scales of the planetary system - Includes elucidation of the grand challenges in ocean mixing, and how they might be addressed
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 Journal of Physical Oceanography written by and published by . This book was released on 1999-09 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fjord Oceanography written by Howard Freeland and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 691 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fjords are deep, glacia11y carved estuaries that are pecu1iar to certain coast1ines, and have severa1 characteristics that dist inguish them from sha110wer embayments. At higher latitudes they indent the western coast1ines of Scandinavia, North and South America, and New Zea1and. They are a1so a common feature of much of the arctic coast1ine. The papers contained in this vo1ume were presented at a workshop funded by the NATO Advanced Studies Institute in Victoria, British Co1umbia. It may seem curious to the reader that this specia1 c1ass of estuaries shou1d have attracted an international gathering of oceanographers from severa1 different discip1ines. The reas on for this interest stems from both practica1 and scientific considerations. On the one hand, fjords are a feature common to the coast1ines of severa1 countries that depend heavi1y on the oceans for communication, fisheries and other resources. The impact of man's activities on these coasts has created a demand for new know1edge of the physica1, bio10gica1 and chemica1 aspects of fjords. Sometimes man's inf1uence on the ocean is intentiona1 as, for examp1e, in the artificia1 contro1 of ice cover; often it is the more insidious bui1d-up of toxic wastes that is of concern. These prob1ems are particu1ar1y acute where the conf1icting demands of fisheries, industria1 deve10pment and re creation meet in a sing1e fjord; and indeed, this is a common occurence a10ng severa1 of the fjords in Scandinavia and Canada.
Download or read book International Journal of Offshore and Polar Engineering written by and published by . This book was released on 2007 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts written by and published by . This book was released on 1997 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Interaction of Ocean Waves and Wind written by Peter Janssen and published by Cambridge University Press. This book was released on 2004-10-28 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was published in 2004. The Interaction of Ocean Waves and Wind describes in detail the two-way interaction between wind and ocean waves and shows how ocean waves affect weather forecasting on timescales of 5 to 90 days. Winds generate ocean waves, but at the same time airflow is modified due to the loss of energy and momentum to the waves; thus, momentum loss from the atmosphere to the ocean depends on the state of the waves. This volume discusses ocean wave evolution according to the energy balance equation. An extensive overview of nonlinear transfer is given, and as a by-product the role of four-wave interactions in the generation of extreme events, such as freak waves, is discussed. Effects on ocean circulation are described. Coupled ocean-wave, atmosphere modelling gives improved weather and wave forecasts. This volume will interest ocean wave modellers, physicists and applied mathematicians, and engineers interested in shipping and coastal protection.
Download or read book Observations of Resonant Internal Wave Interactions Over a Range of Driving Frequencies written by Lon E. Hachmeister and published by . This book was released on 1973 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of the stability of a progressive internal wave of mode 3 propagating down a long tank filled with a lienarly stratified salt solution was conducted over the range 0.45
Download or read book Baroclinic Processes on Continental Shelves written by Christopher N. K. Mooers and published by American Geophysical Union. This book was released on 1986 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Coastal and Estuarine Sciences, Volume 3. The AGU Monograph Series on Coastal and Estuarine Regimes provides timely summaries and reviews of major process and regional studies, both observational and theoretical, and of theoretical and numerical models. It grew out of an IAPSO/SCOR/ECOR working group initiative several years ago intended to enhance scientific communications on this topic. The series' authors and editors are drawn from the international community. The ultimate goal is to stimulate bringing the theory, observations, and modeling of coastal and estuarine regimes together on the global scale.
Download or read book Izvestiia written by Akademii͡a nauk SSSR. and published by . This book was released on 1977 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Weakly Nonlinear Interactions of Instability Waves in a Non Self similar Boundary Layer on an Airfoil written by Dieter W. Sartorius and published by . This book was released on 2007 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Izvestiya written by Академия наук СССР and published by . This book was released on 1976 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt:
