Download or read book The Regeneration of Surface Waves by Wind in Interactions with Internal Gravity Waves written by Owen M. Phillips and published by . This book was released on 1973 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rates of Growth and Decay of Wind Waves Under Conditions of Unsteady Wind written by Jin Wu and published by . This book was released on 1973 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wind Wave and Current Interactions written by Ana Beatriz de Fiegueiredo Melo Villas Bôas and published by . This book was released on 2020 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface gravity waves play a major role in the exchange of momentum, heat, energy, and gases between the ocean and the atmosphere. Strong winds blowing over long fetches give rise to long-period waves, known as swell, that can propagate great distances from their source; hence, the surface wave field in a given region results from the combined response to both local and remote wind forcing. Surface winds off the California coast are marked by strong seasonality and regional scale variability associated with the coastal orography. As a consequence, a particular aspect of the surface wave variability in this region is the influence of these regional-scale high wind events that occur during spring and summer. These alongshore "expansion fan" winds have average speeds of ∼10 m/s and are the dominant forcing for waves off central/northern California, leading to relatively short period waves (8-10 s) that come predominantly from the north-northwest. Waves are also modulated by ocean currents via wave-current interactions, which lead to variations in their direction, frequency, and amplitude. The surface current field in the California Current system (CCS) region is mostly dominated by balanced (rotational) motions in late winter/spring, while divergence is stronger in late summer/fall. Here, we propose a theoretical framework based on ray theory to assess the effects of current divergence and vorticity in the diffusion of wave action density. We show that the potential (divergent) component of the flow has no contribution to the diffusion of wave action. In a separate study, we analyze a large ensemble of numerical experiments using the wave model WAVEWATCH III forced with idealized currents to investigate the role of divergent and rotational flows in modifying wave properties, including direction, period, directional spreading, and significant wave height (Hs). Finally, the results obtained using idealized currents are used to interpret the response of surface waves to realistic currents by running an additional set of simulations using the llc4320 MITgcm output in the CCS region.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Internal Gravity Waves and Their Interaction with the Mean Wind written by Roger Hamilton James Grimshaw and published by . This book was released on 1975 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Response of Wind Ripples to Long Surface Waves written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Further refinement of the rate of wave amplification by wind has resulted from laboratory measurements and numerical calculations. Calculations of the nonlinear interactions in the capillary-gravity range have been extended. We developed a new comfortable method for description of the nonlinear gravity waves interactions on deep water. A Boltzmann's collision term in the Hasselmann's equation was replaced by a nonlinear diffusive operator. The model equation has the same constants of motion as the exact equation and gives correct expressions for weak turbulent Kolmogorov spectra. A numerical simulation of the new model demostrates a pretty good coincidence with the results of solution of the Hasselmann equation. The new model can be efficiently used in the study of physical mechanisms of air-sea interaction. We studied numerically the weak turbulence of capillary waves on deep water. By a direct solution of the Euler equation in approximation of small angles we found that stationary spectra of capillary waves obey the Kolmogorov law KA(.19/4) which is exact solution of kinetic equation for waves. In situation when the turbulence is realized in finite-size tank there is completely new effect of "frozen" turbulence which could be realized at very low levels of the excitations of capillary waves. At "frozen" turbulence regime there is no energy flux from low wavenumbers of pumping toward high wavenumbers of damping.
Download or read book Surface Effects written by Owen M. Phillips and published by . This book was released on 1974 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report analyzes and reviews the processes involved in the generation of modulations in short wave structure by internal waves. The emphasis is on field conditions where, in general, there is wind blowing, a mean current with vertical structure, long and short waves at different directions to the internal wave and possibly surface films. The applicability or otherwise of theoretical analyses and laboratory experiments to field situations is discussed, the problem being the variety of interacting phenomena found under natural conditions. Chapter headings are the following: Mean velocity structure above the thermocline; The variations in surface velocity resulting from internal waves; Surface films; Energy modulations in a surface wave train produced by direct interaction; Wave breaking.
Download or read book Wind Waves Their Generation and Propagation on the Ocean Surface written by Blair Kinsman and published by . This book was released on 1965 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mathematics in Remote Sensing written by S. R. Brooks and published by Oxford University Press, USA. This book was released on 1989 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents an up-to-date survey of the mathematical techniques of use in the generation of data and extraction of information from satellite observation. It presents a state-of-the-art account of what is possible with today's mathematical tools and offers a perspective on the capabilities of future remote sensing systems.
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 2009-09-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describing in detail the two-way interaction between wind and ocean waves, this book discusses ocean wave evolution in accordance with the energy balance equation. An extensive overview of nonlinear transfer is given, and the role of four-wave interactions in the generation of extreme events as well as the effects on ocean circulation is included. The volume will interest ocean wave modellers, physicists, applied mathematicians, and engineers.
Download or read book The Johns Hopkins Oceanographic Studies written by Robert C. Beal and published by . This book was released on 1962 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Conservational Approach to the Interaction of Internal Wave and Surface Waves written by Denny R. S. Ko and published by . This book was released on 1971 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, a linearized solution to the wave and energy conservation equations has been obtained for the case of a one-dimensional internal wave train interacting with a single frequency surface wave train moving in the same direction. The results show a distinct difference from the theory of Hartle and Zachariasen. Favorable comparisons with the experimental results of Lewis are obtained. The so-called "steady state" solutions of Phillips is shown to be a special case of the present solution.
Download or read book The Influence of Surface Waves on Water Circulation in a Mid Atlantic Continental shelf Region written by Charles H. Whitlock and published by . This book was released on 1974 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influences of Surface Waves on the Open Ocean Wind Stress Vector written by Karl Frederik Rieder and published by . This book was released on 1996 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts with Indexes written by and published by . This book was released on 1981 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Application of Gravity Capillary Wave Fourier Analysis for the Study of Air Sea Interaction Physics written by Nathan J.M. Laxague and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Short ocean waves play a crucial role in the physical coupling between the ocean and the atmosphere. This is particularly true for gravity-capillary waves, waves of a scale (O(0.01-0.1) m) such that they are similarly restored to equilibrium by gravitational and interfacial tension (capillary) effects. These waves are inextricably linked to the turbulent boundary layer processes which characterize near-interfacial flows, acting as mediators of the momentum, gas, and heat fluxes which bear greatly on surface material transport, tropical storms, and climatic processes. The observation of these waves and the fluid mechanical phenomena which govern their behavior has long posed challenges to the would-be observer. This is due in no small part to the delicacy of centimeter-scale waves and the sensitivity of their properties to disruption via tactile measurement. With the ever-growing interest in satellite remote sensing, direct observations of short wave characteristics are needed along coastal margins. These zones are characterized by a diversity of physical processes which can affect the short-scale sea surface topography that is directly sensed via radar backscatter. In a related vein, these observations are needed to more fully understand the specific hydrodynamic relationship between young, wind-generated gravity-capillary waves and longer gravity waves. Furthermore, understanding of the full oceanic current profile is hampered by a lack of observations in the near-surface domain (z = O(0.01-0.1) m), where flows can differ greatly from those at depth. Here I present the development of analytical techniques for describing gravity-capillary ocean surface waves in order to better understand their role in the mechanical coupling between the atmosphere and ocean. This is divided amongst a number of research topics, each connecting short ocean surface waves to a physical forcing process via the transfer of momentum. One involves the examination of the sensitivity of short ocean surface waves to atmospheric forcing. Another is the exploration of long wave-short wave interactions and their effects on air-sea interaction vis-à-vis hydrodynamic modulation. The third and final topic is the characterization of the gravity-capillary regime of the wavenumber-frequency spectrum for the purpose of retrieving near-surface, wind-driven current. All of these fit as part of the desire to more fully describe the mechanism by which momentum is transferred across the air-sea interface and to discuss the consequences of this flux in the very near-surface layer of the ocean. Gravity-capillary waves are found to have an outsize share of ocean surface roughness, with short wave spectral peaks showing a connection to turbulent atmospheric stress. Short wave modulation is found to occur strongest at high wavenumbers at the lowest wind speeds, with peak modulation occurring immediately downwind of the long wave crest. Furthermore, short scale roughness enhancement is found to occur upwind of the long wave crest for increasing wind forcing magnitude. Observations of the near-surface current profile show that flows retrieved via this method agree well with the results of camera-tracked dye. Application of this method to data collected in the mouth of the Columbia River (MCR) indicates the presence of a near-surface current component that departs considerably from the tidal flow and orients into the wind stress direction. These observations demonstrate that wind speed-based parameterizations may not be sufficient to estimate wind drift and hold implications for the way in which surface material (e.g., debris or spilled oil) transport is estimated when atmospheric stress is of relatively high magnitude or is steered off the mean wind direction.
