Download or read book The Structure of Turbulent and Wave induced Wind Fields Over Open ocean Waves written by Scott Dennis Miller and published by . This book was released on 1998 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wind Over Wave Couplings written by S. G. Sajjadi and published by OUP Oxford. This book was released on 1999-04-29 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most familiar phenomena on the planet, water waves remain an elusive question for science. The way in which wind blows over water and causes waves is a very active area of research for applied mathematicians, as well as for oceanographers and engineers. The basic mechanisms are still a matter of controversy, although the use of modern techniques of asymptotic and non-linear analysis and large-scale computation, as well as experimental structures, are beginning to reveal the underlying mechanics. These studies are resulting in increasingly powerful methods of forecasting waves and of gauging and controlling their effects on such things as sediment, pollution, and offshore structures. This volume covers the wide range of current research on the relationship between wind and waves and includes contributions from many of the leading authorities in the field.
Download or read book Wind Over Waves written by S G Sajjadi and published by Elsevier. This book was released on 2003-07-01 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses ocean wave processes and turbulence as they affect oceanography, meteorology, marine and coastal engineering. It will enable applied mathematicians, seafarers, and all others affected by these phenomena to predict and control wave effects on shipping safety, weather forecasting, offshore structures, sediment pollution, and ice dynamics in polar regions. The focus is on analytical and computational methods for solving equations of motion and studying non-linear aspects of waves and turbulence. Results included show how sudden gusts and winds over waves can modify the mechanisms of wave-breaking and oceanic turbulence. The book records the proceedings of the Wind Over Waves conference of the Institute of Mathematics and its Applications at Churchill College, Cambridge. Co-sponsors with the IMA are the Institute of Civil Engineers and the Royal Meteorological Society. Addresses ocean wave processes and turbulence as they affect oceanography, meteorology, marine and coastal engineering Focuses on analytical and computational methods for solving equations of motion and studying non-linear aspects of waves and turbulence Records the proceedings of the Wind Over Waves conference of the Institute of Mathematics and its Applications at Churchill College, Cambridge
Download or read book An Experimental Investigation of the Structure of a Turbulent Wind Over Water Waves written by Susumu Karaki and published by . This book was released on 1968 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation presents experimental results from a study of the structure of a turbulent boundary layer developed by air flow over water waves in a lab wind-wave channel. It was demonstrated that the sheared flow region is two-layered, similar to rough wall boundary layers. The inner layer, adjacent to the wall, is describable by the 'law of the wall' and the outer flow by the 'defect law.' The data were taken in two-dimensional flow with small favorable pressure gradients. The first part of the two-part investigation involved air flow over an initially still water surface on which waves developed in response to wind excitation. In the second part, air was passed over water waves of a single frequency and varied amplitude. The results indicated that within the range of this study the water surface can be classed as aerodynamically rough at wind speeds greater than 12 fps and the flow structure of the boundary layer corresponds to that over a rough wall. The velocity decrement due to surface roughness is shown to be a function of the local root-mean-square wave height. The effect of wave-induced fluctuations in the air is limited to a very close neighborhood of the wavy surface. For the specific combination of wind and wave speeds of this study it was found that while the amplitudes of the horizontal components of the fluctuation decreased with increasing elevation, the vertical component increased. (Author).
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 Statistical Correlations of the Wave induced Atmospheric Turbulence Over the Sea written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The micro-meteorological processes that take place in the atmospheric surface layer over oceans can be broadly classified into two categories; transfer of momentum and energy from the wind to the water and, the perturbance of the wind field due to the propagation of waves. The purpose of this paper is to consider the latter process. When waves progress in water they induce an airflow in the initially still air close to the waves with the mean component in the direction of the waves. Over an open ocean, such a situation commonly occurs when waves with swell frequencies propagate in a locally calm meteorological condition. The influence of the swells will be felt even when there is a moderate wind locally. Another characteristic of the above process is the perturbations in the wind velocity fluctuations due to the presence of the waves. Data are reviewed from several theoretical and field studies on disturbances.
Download or read book Wind Stress Over the Ocean written by Ian S. F. Jones and published by Cambridge University Press. This book was released on 2001-09-24 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive 2001 volume for researchers and graduate students in oceanography, meteorology, fluid dynamics and coastal engineering.
Download or read book Wave induced Perturbations in a Turbulent Boundary Layer Over Progressive Water Waves written by Hsi Yen Yu and published by . This book was released on 1973 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structures of the wave-induced perturbations in a turbulent boundary layer over a mechanically generated monochromatic wave-train were experimentally investigated. Both the amplitude and phase of the wave-induced pressure and the two wave-induced velocity components were studied. The wave-induced Reynolds stress and the power input were computed. The magnitude of each term in the governing energy-balance equation was evaluated through the measured values. It was found that each of the wave-induced pressure and velocity components has certain phase and amplitude distribtuion with respect to the distance from the wave surface. Each also varies with the ratio of the mean wind speed and the wave celerity. An effort was made to evaluate the integral energy balance equation through the experimental data. (Modified author abstract).
Download or read book Ocean Wave Dynamics written by Ian Young and published by World Scientific. This book was released on 2020-03-20 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean Wave Dynamics is the most up-to-date book of its kind on the three main processes responsible for the generation and evolution of ocean waves: (i) atmospheric input from the wind, (ii) wave breaking and (iii) nonlinear interactions.Ocean waves are important for many reasons. They are the major environmental impact on in the design of coastal or offshore structures. Ocean waves are also fundamental to the processes of coastal flooding and beach erosion. They will play a major role in storm related coastal flooding which will rise in frequency as a result of sea level rise. Ocean waves are also an important part of the coupled ocean-atmosphere system. They determine the roughness of the ocean surface and hence have an impact on winds, fluxes of energy, gases and heat to the ocean and even the stability of ice sheets.Containing the latest research on ocean waves, it is a valuable resource for an overview of knowledge in this important field.Related Link(s)
Download or read book An Investigation of Wave induced Momentum Flux Through Phase Averaging of Open Ocean Wind and Wave Fields written by Suzanne Wendy Wetzel and published by . This book was released on 1996 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an investigation of the influence of the dominant, wind-driven, surface waves on the vertical flux of horizontal momentum in the marine surface layer over open ocean conditions. Through a procedure which involves phase averaging the wind fields at the period of the dominant waves, the wave-induced component of the atmospheric fluctuations is isolated and vertical profiles of mean wave-induced momentum flux are computed. Previous investigators have used phase averaging to remove the turbulence from an oscillatory signal, but the absence of a monochromatic wave field in open ocean conditions complicates this approach. This difficulty is overcome by choosing only the time periods characterized by the most monochromatic-like waves present and filtering those sections of wind data with a narrow band-pass filter centered around the dominant wave frequency before beginning the phase averaging process. The analysis is carried a step further by investigating the dependence of wave-induced momentum flux on sea state through bin averaging according to wave age. This results in a set of profiles which express the ratio of wave-induced momentum flux to the total flux as a function of the wave age parameter c/U10. These profiles all tend to zero with height, and remain negligible at all heights over fully developed seas. Over younger seas, this ratio becomes increasingly more positive (corresponding to a positive value for - uw) with decreasing wave age; while over older seas, this ratio becomes increasingly more negative with increasing wave age. This provides strong quantitative evidence that there is a significant flux of momentum to the atmosphere from decaying waves, and a transfer of atmospheric momentum to developing waves.
Download or read book A Study of the Turbulent Layer in the Water at an Air water Interface written by Tak Kee Cheung and published by . This book was released on 1985 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because global weather and ocean circulations are driven by energy transfers across the atmosphere-ocean interface, studies of it remain at the forefront of research in atmospheric sciences and oceanography. This experimental program was undertaken with the goal of learning how the energy, which is transferred from the wind, is distributed among the mean, wave, and turbulent flow fields in the water. Model test results show that the waves affect the mean flow, but the mean velocity profiles show logarithmic behavior. The wave field generally agrees with the prediction of a linear water-wave theory. In the wind-wave experiments, the turbulent quantities behave similar to those in flows over flat plates. In the mechanical-wave experiments, the turbulent quantities have different trends from those of the wind-wave cases, which suggests possible weak wave-related turbulence. The mean wave-induced shear stress is negative, which implies that the waves augment the mean flow. Thus, the waves can also transfer energy indirectly to turbulence via the mean flow. The turbulent field draws it energy from the mean flow through the mean turbulent shear stress and from the wave field via the wave-induced turbulent stresses. Keywords include: Ocean surface; and Laser doppler anemometer.
Download or read book Wind Generated Ocean Waves written by I.R. Young and published by Elsevier. This book was released on 1999-03-23 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goals of wind wave research are relatively well defined: to be able to predict the wind wave field and its effect on the environment. That environment could be natural (beaches, the atmosphere etc.) or imposed by human endeavour (ports, harbours, coastal settlements etc.). Although the goals are similar, the specific requirements of these various fields differ considerably. This book attempts to summarise the current state of this knowledge and to place this understanding into a common frame work. It attempts to take a balanced approach between the pragmatic engineering view of requiring a short term result and the scientific quest for detailed understanding. Thus, it attempts to provide a rigorous description of the physical processes involved as well as practical predictive tools.
Download or read book Wind Waves in Oceans written by Igor Lavrenov and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of sea waves has always been in the focus of mankind's atten tion. This is attributed not only to a desire to understand the behaviour in seas and oceans, but also, it has some practical necessity. Developing up-to date wind wave numerical methods requires detailed mathematical modelling, starting with wave generation, development, propagation and transformation on the surface in different water areas under quasi-stationary conditions, up to a synthesis of climatic features observed under different wave generation conditions in oceans, sea or coastal areas. The present monograph considers wind waves in terms of the most general formulation of the problem as a probable hydrodynamic process with wide spatial variability. It ranges between the global scale of the oceans, whose typical size is comparable with the Earth's radius, to the regional and local scales of the seas, including water areas limited in space with significant current or depth gradients in coastal zones, where waves cease their existence having propagated tens of thousand miles.
Download or read book Symposium on Boundary Layers and Turbulence written by and published by . This book was released on with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Operational Analysis and Prediction of Ocean Wind Waves written by Madhav L. Khandekar and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is an attempt to compile the present state of knowledge on ocean wave analysis and prediction. The emphasis of the monograph is on the development of ocean wave analysis and predic tion procedures and their utility for real-time operations and appli cations. Most of the material in the monograph is derived from journal articles, research reports and recent conference proceedings; some of the basic material is extracted from standard text books on physical oceanography and wind waves. Ocean wave analysis and prediction is becoming an important activity in the meteorological and oceanographic services of many countries. The present status of ocean wave prediction may be compar able to the status of numerical weather prediction of the mid-sixties and early seventies when a number of weather prediction models were developed for research purposes, many of which were later put into operational use by meteorological services of several countries. The increased emphasis on sea-state analysis and prediction has created a need for a ready reference material on various ocean wave analysis and modelling techniques and their utility. The present monograph is aimed at fulfilling this need. The monograph should prove useful to the ocean wave modelling community as well as to marine forecasters, coastal engineers and offshore technologists. The monograph could also be used for a senior undergraduate (or a first year graduate) level course in ocean wave modelling and marine meteorology.
Download or read book Advances In Wave Turbulence written by Victor Shrira and published by World Scientific. This book was released on 2013-05-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wave or weak turbulence is a branch of science concerned with the evolution of random wave fields of all kinds and on all scales, from waves in galaxies to capillary waves on water surface, from waves in nonlinear optics to quantum fluids. In spite of the enormous diversity of wave fields in nature, there is a common conceptual and mathematical core which allows to describe the processes of random wave interactions within the same conceptual paradigm, and in the same language. The development of this core and its links with the applications is the essence of wave turbulence science (WT) which is an established integral part of nonlinear science.The book comprising seven reviews aims at discussing new challenges in WT and perspectives of its development. A special emphasis is made upon the links between the theory and experiment. Each of the reviews is devoted to a particular field of application (there is no overlap), or a novel approach or idea. The reviews cover a variety of applications of WT, including water waves, optical fibers, WT experiments on a metal plate and observations of astrophysical WT.
Download or read book Waves in Oceanic and Coastal Waters written by Leo H. Holthuijsen and published by Cambridge University Press. This book was released on 2010-02-04 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Waves in Oceanic and Coastal Waters describes the observation, analysis and prediction of wind-generated waves in the open ocean, in shelf seas, and in coastal regions with islands, channels, tidal flats and inlets, estuaries, fjords and lagoons. Most of this richly illustrated book is devoted to the physical aspects of waves. After introducing observation techniques for waves, both at sea and from space, the book defines the parameters that characterise waves. Using basic statistical and physical concepts, the author discusses the prediction of waves in oceanic and coastal waters, first in terms of generalised observations, and then in terms of the more theoretical framework of the spectral energy balance. He gives the results of established theories and also the direction in which research is developing. The book ends with a description of SWAN (Simulating Waves Nearshore), the preferred computer model of the engineering community for predicting waves in coastal waters.
