Ocean Wave Statistics from Fleet Numerical Weather Central Spectral Analyses PDF Download
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Author: Warren Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
This report is directed toward potential applications of Fleet Numerical Weather Central spectral ocean wave products to coastal engineering. It deals specifically with formatting and properties of climatological wave data derived from synoptic spectral, wave information and speculates on the shoal water transformation of these deep-water data.
Author: Warren Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
This report is directed toward potential applications of Fleet Numerical Weather Central spectral ocean wave products to coastal engineering. It deals specifically with formatting and properties of climatological wave data derived from synoptic spectral, wave information and speculates on the shoal water transformation of these deep-water data.
Author: Warren C. Thompson
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 38
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Book Description
Specifications are presented for the production of ocean wave statistics for the California coast from approximately 28 years of archived synoptic wave analyses computed by the Fleet Numerical Weather Central, Monterey, California. The wave statistics, designed for coastal engineering application, would be prepared for six deep-water stations uniformly spaced along the coast from the Oregon border to the Mexico border, and would be prepared in the form of desk-top copy immediately available for use. (Author).
Author: William Harvey Massicot
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 188
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Book Description
Fleet Numerical Weather Central (FNWC) wave period and height analyses for a selected grid point were verified by comparison with wave conditions recorded by a coastal wave sensor at San Clemente Island, California. Forty-six per cent of the FNWC wave heights were within plus or minus 1 foot of the recorded heights, 75% were within plus or minus 2 feet, and 91% were within plus or minus 4 feet. The FNWC heights were found to be over-six per cent of the FNWC periods were within plus or minus 1 second of the recorded periods, 45% were within plus or minus 2 seconds, 66% were within plus or minus 4 seconds, and 90% were within plus or minus 6 seconds. There was no tendency for FNWC to over or underpredict swell periods, but wind-wave periods were under predicted on the average by five seconds. (Author).
Author: Felix Michael Reynolds
Publisher:
ISBN:
Category :
Languages : en
Pages : 139
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Book Description
A summer and winter month of 12-hourly synoptic spectral wave analyses produced by the Fleet Numerical Weather Central, Monterey, California were used to develop three experimental wave climatology formats for a point in the Gulf of Alaska; the analyses were produced by the Spectral Ocean Wave Model at FNWC which computes the wave energy contained in 12 direction bands and 15 frequency bands for a grid point array in the Northern Hemisphere oceans. The gross climatology format displays frequency of occurrence of significant wave height by period and direction, but does not differentiate between sea and swell. The two-dimensional spectral climatology format is a tabulation of the frequency of occurrence of spectral energy in various frequency and direction bands. The one-dimensional spectral format displays the distribution of spectral wave energy over various frequency bands but contains no directional information. Both of the spectral formats appear to have their greatest potential application in resonance response of floating and fixed structures. (Author).
Author: John G. Hayes
Publisher:
ISBN:
Category : Artificial satellites in oceanography
Languages : en
Pages : 166
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Book Description
An operational shallow water wave refraction model, incorporating the work of Chao, has been developed to include refraction due to ocean currents. Analyses of spectra from time histories taken during the Marineland SEASAT-A Test Experiment, on the continental shelf of Florida, are used to compare with the refraction results. The deep ocean Spectral Ocean Wave Model (SOWM) in use at Fleet Numerical Weather Central (FNWC) was used to initialize the shallow water model. Within the limits of directional resolution of the SOWN, the results are sufficient in this case to agree with the predicted theory of wave-current interaction. Appreciable modifications of the waves can occur when they interact with a major ocean current. The results illustrate that considerable error will occur in the shallow water spectrum if wave-current interaction is not considered.
Author: Sheldon M. Lazanoff
Publisher:
ISBN:
Category : Ocean-atmosphere interaction
Languages : en
Pages : 83
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Book Description
An operational Mediterranean wave spectral model has been developed through the cooperative efforts of the U.S. Naval Oceanographic Office (NAVOCEANO), Fleet Numerical Weather Central (FNWC) and New York University (NYU). Since April 1972, the model has been operating in a real-time environment (analyses/prognosis to 48 hours). The model is a modified version of the original NYU North Atlantic wave model and has two main parts: (1) wave energy growth based on a modified version of the Miles-Phillips growth mechanism and dissipation at individual grid points and (2) wave energy propagation from grid point to grid point. The Mediterranean wave model uses a conic conformal grid, permitting the assumption of equal spacing between grid points. There are 455 sea points with a mesh length of 67 km. The wave model driving force is a modified version of the FNWC Marine Wind model which has a mesh length of approximately 370 kms. For use in the Mediterranean, the winds are interpolated between Marine Wind field grid points. At analysis/pre-analysis times, wind reports from synoptic ship files are reanalyzed in the Mediterranean wind program so that local wind phenomena, such as 'mistrals, ' are included in the wind field.
Author: Madhav L. Khandekar
Publisher: Springer Science & Business Media
ISBN: 1461389526
Category : Science
Languages : en
Pages : 223
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 730
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Book Description
Author: W. C. Thompson
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 40
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Book Description
Author: M. D. Earle
Publisher: Springer Science & Business Media
ISBN: 1468433997
Category : Science
Languages : en
Pages : 367
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Book Description
Waves critically affect man in coastal regions, including the open coasts and adjacent continental shelves. Preventing beach erosion, designing and building structures, designing and operating ships, providing marine forecasts, and coastal planning are but a few examples of projects for which extensive information about wave conditions is critical. Scientific studies, especially those in volving coastal processes and the development of better wave prediction models, also require wave condition information. How ever, wave conditions along and off the coasts of the United States have not been adequately determined. The main categories of available wave data are visual estimates of wave conditions made from ships at sea, scientific measurements of waves made for short time periods at specific locations, and a small number of long-term measurements made from piers or offshore platforms. With these considerations in mind, the National Ocean Survey of the National Oceanic and Atmospheric Administration sponsored the Ocean Wave Climate Symposium at Herndon, Virginia, July 12-14, 1977. This volume contains papers presented at this symposium. A goal of the symposium was to establish the foundations for a com prehensive and far-sighted wave measurement and analysis program to fully describe the coastal wave climate of the United States. Emphasis was placed on ocean engineering and scientific uses of wave data, existing wave monitoring programs, and modern measure ment techniques which may provide currently needed data.
