Download or read book An Experimental Study of a Method to Attenuate Surface Waves Over a Limited Region of the Open Ocean written by Richard I. Hires and published by . This book was released on 1978 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the refraction of surface gravity waves by relatively narrow (of the order of or less than one wave length) and shallow, laterally sheared, surface currents was undertaken to determine the feasibility of employing artificially-generated currents to achieve local wave damping in the ocean. In the experiments, single frequency wave trains (wave length, wave length sub 0, in still water) were initially propagated in the same direction as the direction of the current in the wake of a towed grid (with lateral extent, W sub g, and draft, d sub g). The required power for wave lengths up to 300 feet was within the range of installed power of conventional off-shore boats.

Download or read book An Experimental Study of a Method to Attenuate Surface Waves Using Artificially Generated Surface Currents written by Richard I. Hires and published by . This book was released on 1983 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous studies showed the effectiveness of laterally-sheared wakes of towed rigid grids in achieving substantial attenuation of following regular wave trains by refraction. Significant attenuation could be obtained in wakes with widths comparable to the incident wave length, with depths of the order of 10% of the incident wave length and with grid tow speeds about 10% of the incident wave celerity. In the present study, model-scale experiments were conducted to extend the earlier results to the cases of random waves and of oblique waves, to determine attenuation for two possible operational scenarios for the prototype application of this method, and to test the effectiveness of a towed net to replace the towed rigid grid for full-scale use. Test results for random following seas were consistent with earlier tests with regular following waves. For oblique seas, the region of attenuation in the wake of the grid was shifted laterally towards the downwave side of the wake. In addition, peak attenuation was less than that expected from a simple extrapolation of the semi-empirical prediction formula developed for following seas to the case of oblique waves. Model tests with a towed flexible net held open with attached paravanes revealed that similar levels of attenuation could be obtained with this apparatus as that achieved with the towed rigid grids. Field tests of this wave attenuation method was conducted at intermediate scale in New York Harbor and at full-scale in the ocean off Miami.

Download or read book Open file Report written by and published by . This book was released on 1980 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research and Development Program for Outer Continental Shelf Oil and Gas Operations written by Geological Survey (U.S.) and published by . This book was released on 1979 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Experimental Study of the Growth of Mechanically Generated Surface Water Waves when Subjected to a Fully Developed Turbulent Channel Airflow written by W. Stanley Wilson and published by . This book was released on 1972 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was conducted to measure the growth rates of mechanically generated surface water waves when subjected to fully developed turbulent channel airflow. The study was designed to test the accuracy of the growth rates predicted by the Miles; 1962 Theory. (Author).

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Experimental Study of Oscillatory Waves written by Martin Alexander Mason and published by . This book was released on 1942 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book A Laboratory Experiment on Surface Wave Attenuation Due to Underwater Turbulence written by James Edward Paquin and published by . This book was released on 1968 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The attenuation of surface waves caused by underwater turbulence was investigated in a wave-tank experiment. The waves studied (frequencies ranging from 1.2 to 12.3 Hertz) were strongly attenuated by a zone of grid-generated turbulence. This attenuation depended on the length of the turbulent region, and on the frequency of the incident wave. The equation governing attenuation was: h = h sub 0 exp( -ax) where h is wave height, h sub 0 is undisturbed wave height, x is the length of the turbulent region, and a is an attenuation coefficient proportional to the cube root of frequency. It was also noted that the waves were shifted in phase as they passed through the turbulence, and that the magnitude of this shift increased with frequency. The quantitative results of the experiment were obtained from measurements of nearly sinusoidal waves. They were confirmed, qualitatively, for a continuous spectrum of waves by measurement of wind-generated model sea surface. (Author).

Download or read book Inventory of Federal Energy related Environment and Safety Research for written by and published by . This book was released on 1980 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by United States. National Bureau of Standards and published by . This book was released on 1966 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1983-12 with total page 1036 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inventory of Federal Energy related Environment and Safety Research for FY 1979 written by and published by . This book was released on 1980 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current Hydraulic Laboratory Research in the United States written by and published by . This book was released on 1966 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Special Publication written by and published by . This book was released on 1965 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Study of Surface Waves in Shoaling Water written by Robert L. Wiegel and published by . This book was released on 1949 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Experimental Study of Surface Waves on a Periodic Surface written by Charles Jerry Schneider and published by . This book was released on 1972 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: