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Author : Frederick Edward Isaac
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (278 download)
Download or read book Analysis of Directional Wave Spectra as Measured by H.F. Radar written by Frederick Edward Isaac and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lucy Rhiannon Wyatt
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Direction and Frequency Resolution in HF Radar Directional Wave Spectra Measurements written by Lucy Rhiannon Wyatt and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald E. Barrick
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (228 download)
Download or read book Status of HF Radars for Wave-Height Directional Spectral Measurements written by Donald E. Barrick and published by . This book was released on 1982 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manuscript is a concise review of the status of high-frequency (HF) radars for measuring various descriptors of the ocean wave-height directional spectrum. It is not intended as a historical account of the many developments and contributors to the subject over the past three decades, nor is it meant to develop the theory and techniques of HF radar in sufficient detail for planning HF radar programs. Finally, no attempt is made to review every MF/ HF experiment performed or analyzed, although several very clever techniques have been tried (e.g., bistatic arrangements, synthetic aperture systems, and balloon-borne antennas); rather, techniques are discussed that appear to have potential for practical, operational ocean monitoring. The next section reviews very briefly the principles of HF radar sea echo that make it possible to measure the wave-height directional spectrum. The section following discusses the capability and status of sky-wave (over-the-horizon) radar for making wide- area ocean surface measurements. The final section discusses the application of HF ground-wave radars to measuring the wave-height directional spectrum, both for coastal use and for deployment from offshore platforms or ships, and their accuracy. In all cases, the limitations as well as the advantages of HF radars are indicated.
Author : Abdelrahman M. Elabdalla
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.:/5 (318 download)
Download or read book Remote Sensing of the Directional Ocean Wave Spectra Using HF Backscatter Radar written by Abdelrahman M. Elabdalla and published by . This book was released on 1982 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chengxi Shen
Publisher :
ISBN 13 :
Total Pages : 264 pages
Book Rating : 4.:/5 (995 download)
Download or read book The High Frequency Surface Wave Radar Cross Section for Ocean Swell written by Chengxi Shen and published by . This book was released on 2013 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (911 download)
Download or read book Proposal to Demonstrate an HF Radar System for Measuring the Ocean-wave Directional Spectrum from Offshore Platforms written by and published by . This book was released on 1981 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lucy Rhiannon Wyatt
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Prospects for Operational HF Radar Measurements of the Ocean Wave Directional Spectrum written by Lucy Rhiannon Wyatt and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)
Download or read book Directional Properties of Surface Waves Observed With HF Radar written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the work at Sheffield is to demonstrate that wave measurements obtained using HF radars are of sufficient accuracy and availability for them to contribute to the investigation of changes to the directional spectrum of waves subject to meteorological bathymetric and current variability in coastal environments for both scientific and operational applications. This report summarizes the measurements made with the OSCR HF radar in collaboration with the University of Miami, during the SHOWEX experiment in fall 1999 using inversion algorithms developed at the University of Sheffield. The data set obtained contains interesting examples of shoaling waves and fetch limited wave development but the amount of data obtained was limited by the hardware constraints of the OSCR system. Comparisons with directional wave buoys confirmed the results of earlier work that signal-to-noise and antenna sidelobes are the main sources of error in the radar wave measurements.
Author : COST Action 714
Publisher :
ISBN 13 : 9789289448901
Total Pages : 155 pages
Book Rating : 4.4/5 (489 download)
Download or read book Measurement and use if directional spectra of ocean waves written by COST Action 714 and published by . This book was released on 2003 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Li-hwa Lin
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.:/5 (11 download)
Download or read book The Analysis of Directional Wave Spectra from Current and Pressure Measurements written by Li-hwa Lin and published by . This book was released on 1983 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Directional wave spectra have been estimated in this study based upon simultaneous subsurface measurements of current and pressure. Two previously developed methods, the stochastic and deterministic approaches, have been reviewed and restudied. It is demonstrated by means of the Correlation Theorem that the stochastic and deterministic approaches are, under certain conditions, identical. In order to improve directional spectrum results obtained from the combined stochastic/deterministic approach, a new method, the geometric approach, has been developed as part of this research effort. The geometric approach matches Fourier transformed wave properties to frequency dependent wavelet pairs in each frequency interval. The amplitude, direction and phase of each wavelet are uniquely specified by equating kinematic and dynamic properties for each frequency component. Wavelets evaluated in each frequency interval do not have an artificially imposed phase constraint in the geometric approach as they have in the stochastic/deterministic approach, providing a more realistic model to represent the directional properties of ocean random waves. This study shows that the geometric approach provides more reliable predictions of the water surface one-dimensional spectra as well as directional spectra. Finally, some semi-empirical equations are proposed and combined to represent the directional spectrum model. A least square error minimization analysis is used to quantify empirical equation parameters. The resulting directional spectra obtained from alternative methods are compared based on either real ocean data or computer simulated data.
Author : Jane Mckee Smith
Publisher : World Scientific
ISBN 13 : 9814480525
Total Pages : 4836 pages
Book Rating : 4.8/5 (144 download)
Download or read book Coastal Engineering 2004 - Proceedings Of The 29th International Conference (In 4 Vols) written by Jane Mckee Smith and published by World Scientific. This book was released on 2005-04-08 with total page 4836 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and up-to-date volume contains 367 papers presented at the 29th International Conference on Coastal Engineering, held in Lisbon, Portugal, 19-24 September 2004. It is divided into five parts: waves; long waves, nearshore currents, and swash; sediment transport and morphology; coastal management, beach nourishment, and dredging; coastal structures. The contributions cover a broad range of topics including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2004 provides engineers, scientists, and planners state-of-the-art information on coastal engineering and coastal processes.The proceedings have been selected for coverage in:
Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (932 download)
Download or read book Measurement of Ocean Wave Spectra Using a Ship-mounted HF Radar written by and published by . This book was released on 1990 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A promising alternative to in situ methods such as wave buoys for measuring ocean wave spectra is HF ground wave radar. This paper describes an algorithm used to extract the nondirectional wave-height spectrum from the backscatter return of a stationary ship- or rig-mounted radar employing an omnidirectional antenna for both transmission and reception. To test the effectiveness of the algorithm, its estimates are compared to those of a WAVE-TRACK buoy using data collected onboard CFAV Quest during 1988.
Author : Mei Wang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (668 download)
Download or read book Comparison of Wave Parameters and Spectra Between Wera Hf Radars and Tri-axys Buoys written by Mei Wang and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To establish the credibility of surface wave measurements from two phased-array WERA HF (High Frequency) radars, SEACOOS (SouthEast Atlantic Coastal Ocean Observing System) funded the Mini-Waves experiment from March to May, 2005. For this study, the surface wave parameter (significant wave height) and directional wave spectrum obtained from two WERA radars were compared with those obtained from two Tri-Axys buoys during the same period. The Wyatt (1990) method was used to obtain the directional wave spectra, and significant wave heights were obtained by integrating the directional wave spectra over all directions and the selected frequency band. The SWAN (Simulating WAve Nearshore) directional wave model was used to evaluate the comparison results between WERA radars and buoys. There was a good agreement between WERA radars and Tri-Axys buoys when the echo-Doppler spectrum had a high 2nd-order SNR (signal-to-noise) ratio. The measurements didn2t agree in low sea states when the echo-Doppler spectrum had a lower SNR. Also, strong horizontal current shear caused by Florida Current (FC) had an effect on wave propagation direction. To improve the quality of WERA radar wave measurements, a longer sampling interval (10-minute interval) and procedures to remove the effect of RFI are needed.
Author : NATIONAL RESEARCH COUNCIL WASHINGTON DC MARINE BOARD.
Publisher :
ISBN 13 :
Total Pages : 259 pages
Book Rating : 4.:/5 (227 download)
Download or read book Measuring Ocean Waves written by NATIONAL RESEARCH COUNCIL WASHINGTON DC MARINE BOARD. and published by . This book was released on 1981 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Operational Needs for Wave Data; Research Needs for Wave Data; Survey of Remote Sensing Techniques for Wave Measurement; Remote Sensing of Ocean Waves by Surface Contour Radar; The Use of Synthetic Aperture Radar (SAR) to Measure Ocean Gravity Waves; Status of HF Radars for Wave-Height Directional Spectral Measurements; Aircraft and Satellite Measurement of Ocean Wave Directional Spectra Using Scanning-Beam Microwave Radars; Review of Wave Measurement Using In Situ Systems; Wave Measurements Using Surface-Mounted Instruments; Pitch-Roll Buoy Wave Directional Spectra Analysis; Subsurface Wave-Measuring Systems; Wave-Measurement Technology in the 1980s; Workshop Sessions.
Author : F. Dobson
Publisher : Springer Science & Business Media
ISBN 13 : 1461591821
Total Pages : 797 pages
Book Rating : 4.4/5 (615 download)
Download or read book Air-Sea Interaction written by F. Dobson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 797 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade, man's centuries-old interest in marine me teorology and oceanography has broadened. Ocean and atmosphere are now treated as coupled parts of one system; the resulting interest in air-sea interaction problems has led to a rapid growth in the sophistication of instruments and measurement techniques. This book has been designed as a reference text which describes, albng with the instruments themselves, the accumulated practical experi ence of experts engaged in field observations of air-sea interac tions. It is meant to supplement rather than replace manuals on standard routine observations or instnunentation handbooks. At the inception a textbook was planned, which would contain only well tested methods and instruments. It was quickly discovered that for the book to be useful many devices and techniques would have to be included which are still evolving rapidly. The reader is therefore cautioned to take nothing in these pages for granted. Certainly, every contributor is an expert, but while some are back ed up by generations of published work, others are pioneers. The choice of topics, of course, is debatable. The types of observa tions included are not exhaustive and topics such as marine aero sols and radio-tracers are omitted, as was the general subject of remote sensing, which was felt to be too broad and evol ving too rapidly. The guideline adopted in limiting size was maximum use fulness to 'a trained experimentalist new to the field'.
Author : F. M. Monaldo
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Measurements of Directional Wave Spectra by the Shuttle Synthetic Aperture Radar written by F. M. Monaldo and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pasquale Daponte
Publisher : Springer Nature
ISBN 13 : 3030820246
Total Pages : 325 pages
Book Rating : 4.0/5 (38 download)
Download or read book Measurement for the Sea written by Pasquale Daponte and published by Springer Nature. This book was released on 2022-01-24 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the history of humankind, the sea has always played a key role as a privileged medium for communication, commerce and contact among population centers. It constitutes an essential ecosystem, and an invaluable reservoir and source of food for all living beings. Therefore, its heath is a critical challenge for the survival of all humanity, particularly as one the most important environmental components targeted by global warming. Measuring and monitoring techniques are key tools for managing the marine environment and for supporting the Blue Economy. With this perspective, a series of annual international events, entitled Metrology for the Sea (MetroSea for short) was begun in 2017. Their increasing success inspired this book, which provides an anthology of tutorials dealing with a representative selection of topics of concern to a broad readership. The book covers two broad application areas, marine hydrography and meteorology, and then deals with instrumentation for measurement at sea. Typical metrological issues such as calibration and traceability, are considered, for both physical and chemical quantities. Key techniques, such as underwater acoustic investigation, remote sensing, measurement of waves and monitoring networks, are treated alongside marine geology and the monitoring of animal species. Economic and legal aspects of metrology for navigation are also discussed. Such an unparalleled wide vision of measurement for the sea will be of interest to a broad audience of scientists, engineers, economists, and their students.
