Download or read book A Laboratory Study of Wind wave current Interactions written by Richard S. Scotti and published by . This book was released on 1975 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Laboratory Study of Wind Wave Current Interaction written by Richard S. Scotti and published by . This book was released on 1976 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report studies the effect of wind and a spatially varying subsurface current field on both the wind-induced drift layer and the surface-wave spectrum. Steady state wind-wave-current interactions were established over a region of uniform current gradients which simulated an internal-wave-fixed measuring system. Wave-height spectra were recorded while wave-slope spectra were simultaneously made.

Download or read book A Laboratory Study of Wind Wave Current Interactions Part I written by and published by . This book was released on 1975 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two series of experiments were performed to study the interactions between both the wind-induced drift layer and the surface wave spectrum and a spatially varying subsurface current field. In the first, measurements were made of the response of the drift layer and surface wave spectrum to an appreciable, but unknown, current gradient. This was accomplished by forcing the current from a 90 cm-deep diffuser section onto a 68.7 cm-deep flat beach. The flow, thereby, experienced a current gradient which diminished to, and remained essentially at, zero a short distance downstream of the beach leading edge. Relaxation times inferred from the data are on the order of 1 to 3 minutes. For the second test series, the beach was set at an angle of 2.65 deg to produce strain rates. Here again, the results indicate that the response of the drift layer lags behind that of the current, as strained by the beach. The measurements of surface wave spectra taken for each of the conditions tested are presently being analyzed in detail; however, some preliminary results are presented.

Download or read book Laboratory Studies of Wind wave Interactions written by Jin Wu and published by . This book was released on 1967 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is confirmed that the velocity distribution essentially follows the logarithmic law near the water surface and the velocity-defect law toward the outer edge of the boundary layer. Calculated from these distributions, the wind stresses and surface roughnesses are divided into two groups separated by the occurrence of wave-breaking phenomenon. For sufficiently low wind velocity, U, the surface roughness is dictated by ripples and the wind-stress coefficient varies with U to the -1/2 power. The average height of the basic gravity wave is proportional to the surface roughness at higher wind velocities; the stress coefficient is then proportional to U. In addition, it is found that the Charnock's expression holds only at high wind velocities, and that the constant of proportionality determined from the experiment correlates very well with the field observations. Finally, the wind-stress coefficient is shown to be larger than the friction coefficient for turbulent flow along a solid rough surface; the difference is shown to be the wave drag of the wind over the water surface. (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 Wind generated Waves for Laboratory Studies written by D. Lee Harris and published by . This book was released on 1976 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Ocean Dynamics written by Maged Marghany and published by Elsevier. This book was released on 2021-02-09 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear Ocean Dynamics: Synthetic Aperture Radar delivers the critical tools needed to understand the latest technology surrounding the radar imaging of nonlinear waves, particularly microwave radar, as a main source to understand, analyze and apply concepts in the field of ocean dynamic surface. Filling the gap between modern physics quantum theory and applications of radar imaging of ocean dynamic surface, this reference is packed with technical details associated with the potentiality of synthetic aperture radar (SAR). The book also includes key methods needed to extract the value-added information necessary, such as wave spectra energy, current pattern velocity, internal waves, and more. This book also reveals novel speculation of a shallow coastal front: named as Quantized Marghany's Front. Rounding out with practical simulations of 4-D wave-current interaction patterns using using radar images, the book brings an effective new source of technology and applications for today’s coastal scientists and engineers. Solves specific problems surrounding the nonlinearity of ocean surface dynamics in synthetic aperture radar data Helps develop new algorithms for retrieving ocean wave spectra and ocean current movements from synthetic aperture radar Includes over 100 equations that illustrate how to follow examples in the book

Download or read book An Experimental Study of Wind wave Interactions written by Richard Ives Hires and published by . This book was released on 1968 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was made to determine the ratio of the wave-supported shear stress, phi sub w; to the total shear stress on the water surface, phi sub o. The experimental conditions were designed to correspond to those required for the application of the viscous shear flow theory of wave generation proposed by Brooke Benjamin (1959) and Miles (1962b). The experiments were performed in a wind-wave tunnel, 48 x 3-1/2 x 2 feet, with a mean water depth of 1-1/2 feet. The wind in the 6 in. air space above the water was fully-developed turbulent channel flow. The mean center-line wind speed, U sub xi, was kept constant at 1.20 m/s during all measurements made with the wind blowing over the water. An artificially generated, single-component, wave train of small amplitude provided a known, initial perturbation of the water surface with which the wind could interact. The range of wave frequencies investigated was from 4.0 to 5.2 cps. Wave measurements were made with capacitance wave probes, wind measurements with hot-wire anemometers. (Author).

Download or read book On the Variability of the Wind Stress at the Air sea Interface written by Fei Zhang and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates wind-wave-current interaction, wave breaking detection and the analysis of breaking characteristics at the air-sea interface. In-situ data measured during the Shoaling Waves Experiment (SHOWEX) and Baltic Sea Swell Experiment (BASE) are applied in the studies and analysis. Wind, wind stress and wave data were obtained from several Air Sea Interaction Spar (ASIS) buoys. Surface currents were measured by a High-Frequency Ocean Surface Current Radar. Two distinct types of wave-current-wind interaction were observed in the presence of a strong along-coast current. First, the horizontal current shear resulted in wind-sea waves shifting away from the wind direction. This motion resulted in a steering of the stress away from the mean wind direction. Second, short wind waves on a uniform current are shifted to the current direction, and the wind stress is steered toward the current direction by the short waves. The wind stress veering has been confirmed by data from the SeaWind scatterometer on board the QuikSCAT satellite. This finding is in agreement with the results from some recent studies. The present study also describes an experimental investigation of breaking wave detection by ASIS buoys. A method, developed from the laboratory, and using local wave parameters to provide a detailed description of breaking, is applied to wave data from ASIS buoys. One the basis of these data, the relation between breaking probability and wind speed shows characteristics similar to those from several field experiments with different conditions. Furthermore, additional parameters, wave age and wave steepness, are also shown to affect the breaking probability during our in-situ measurements. Upper ocean shear, which can modulate wave breaking as predicted by both theory and laboratory work, are also observed to change the breaking properties. This characteristic is rarely reported by in-situ experiment.

Download or read book NASA Wallops Flight Facility Air Sea Interaction Research Facility written by Steven R. Long and published by . This book was released on 1992 with total page 50 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 1989 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Study of the Generation of Wind Waves in Shallow Water Classic Reprint written by Osvald J. Sibul and published by Forgotten Books. This book was released on 2019-03-16 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Laboratory Study of the Generation of Wind Waves in Shallow Water The prediction of wave characteristics in shallow water is of great importance along much of the Gulf Coast of the United States, as well as for many inland water areas (as Lake Okeechobee, Florida). This has been difficult in the past as the effect of the shallow bottom is considerable, particularly in reducing the wave height from what would be expected by use of the deep water wave prediction methods. This report gives the results of some laboratory studies of wave generation in shallow water in a small enclosed wind-wave tank. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book NBS Special Publication written by and published by . This book was released on 1980 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Laboratory Study of the Influence of Currents on Wind Generated Waves written by Steven Roscoe Long and published by . This book was released on 1975 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Study of Wind Waves in Shallow Water written by Osvald Sibul and published by . This book was released on 1954 with total page 80 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.