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A Columbia River Entrance Wave Forecasting Program Developed At The Ocean Products Center
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Book Synopsis A Columbia River Entrance Wave Forecasting Program Developed at the Ocean Products Center by : Yongyao Zhao
Download or read book A Columbia River Entrance Wave Forecasting Program Developed at the Ocean Products Center written by Yongyao Zhao and published by . This book was released on 1989 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the OPC spectral wave forecasting model for the Columbia River Bar, as well as the results of some numerical experiments, on both micro and main frame computers. The model, essentially, calculates the transformation of offshore wave spectra forecasted by the OPC global wave model due to the combined effects of bottom topography and tidal currents in the vicinity of the Columbia River entrance.
Book Synopsis Wave-current Interaction in the Columbia River Entrance by : D. Lee Harris
Download or read book Wave-current Interaction in the Columbia River Entrance written by D. Lee Harris and published by . This book was released on 1981 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Development of Forecast Techniques for Wave and Surf Conditions Over the Bars in the Columbia River Mouth and at the Entrance to Yaquina Bay by : William Hewes Quinn
Download or read book The Development of Forecast Techniques for Wave and Surf Conditions Over the Bars in the Columbia River Mouth and at the Entrance to Yaquina Bay written by William Hewes Quinn and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating Surface Currents in the Slope Water Region Between 37 and 41°N Using Satellite Feature Tracking by :
Download or read book Estimating Surface Currents in the Slope Water Region Between 37 and 41°N Using Satellite Feature Tracking written by and published by . This book was released on 1992 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Feasibility Study on Operational Use of Geosat Wind and Wave Data at the National Meteorological Center by : Tsann-wang Yu
Download or read book A Feasibility Study on Operational Use of Geosat Wind and Wave Data at the National Meteorological Center written by Tsann-wang Yu and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of the use of Geosat altimeter-derived wind speed and significant wave height data for operational applications is investigated. Geosat wind and wave data are compared with buoy observations for a 17 month period to determine the error characteristics as a function of various data acceptance time windows and spatial separation distances between the colocated data points. The results show that Geosat wind speed errors are sensitive to the time acceptance windows and less so to spatial separation distances, whereas Geosat wave height errors are not so sensitive to spatial and temporal separations. Three days of Geosat wind speeds and two periods of near real time Geosat significant wave height data are assimilated into the NMC's operational weather and wave forecast models. The results show that inclusion of Geosat wind speed data leads to a small impact in the southern Hemisphere, and virtually no impact in the northern Hemisphere. The Geosat significant wave height data, on the other hand, are found to have a positive impact and are extremely beneficial in short range wave forecasts over the global oceans.
Book Synopsis Prediction of Hazardous Columbia River Bar Conditions by : David B. Enfield
Download or read book Prediction of Hazardous Columbia River Bar Conditions written by David B. Enfield and published by . This book was released on 1973 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study methods were developed for the prediction of wave conditions that are hazardous to navigation at river entrances, with emphasis on applicability to the Columbia River. There are two basic components to the prediction system: (1) a semi-automated spectral method for forecasting the significant height and average period of waves in deep water, and (2) an index of navigation hazard at river entrances that depends on the significant height and average period in deep water and on the mean current and water depth at the entrance. The computerized, deep water forecast method is a hybrid scheme that combines the spectral principles of the Pierson-Neumann-James method with the graphical input techniques of Wilson and the fetch limited spectrum of Liu. The significant heights generated by the method are well verified by winter wave measurements at Newport, Oregon. The hazard index is based on the probability of wave-breaking in water of arbitrary depth and current. The breaking probability is derived under the assumption that wave heights and squared periods are statistically independent and distributed according to a Rayleigh probability density function. The breaking-wave probability and the hazard index depend on the wave steepness in deep slack water and on the depth (relative to the wave period squared) and current (relative to the period) at the river entrance. The dependence on depth and current is achieved in two ways: (1) the limiting steepness (breaking index) k found as a function of relative depth and relative current, and (2) the wave spectrum in water of arbitrary depth and current is found by transformation of the spectrum in deep slack water. The transformation is performed by requiring that the rate of wave energy propagation remain constant. The hazard index is closely related to the probability of breaking swell. At water depths that are typical of river entrances, the hazard index depends strongly on the significant wave height, mean current and depth, but only weakly on the mean wave period (since the breaking height of swell at such depths is only weakly dependent on period). Hindcasts of deep water significant wave heights and hazard indices compared reasonably well with measured heights and Columbia River bar closure periods. Forecasts based on accurate prognostic weather charts should provide similar results.
Download or read book Numerical Weather Prediction written by and published by . This book was released on 1990 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Environmental Science Information Center. Library and Information Services Division Publisher : ISBN 13 : Total Pages :508 pages Book Rating :4.3/5 (91 download)
Book Synopsis Book Catalog of the Library and Information Services Division: Author-title-series indexes by : Environmental Science Information Center. Library and Information Services Division
Download or read book Book Catalog of the Library and Information Services Division: Author-title-series indexes written by Environmental Science Information Center. Library and Information Services Division and published by . This book was released on 1977 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Environmental Science Information Center. Library and Information Services Division Publisher : ISBN 13 : Total Pages :514 pages Book Rating :4.3/5 ( download)
Book Synopsis Book catalog of the Library and Information Services Division by : Environmental Science Information Center. Library and Information Services Division
Download or read book Book catalog of the Library and Information Services Division written by Environmental Science Information Center. Library and Information Services Division and published by . This book was released on 1977 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanics Computing in 1990's and Beyond: Computational mechanics, fluid mechanics, and biomechanics by : Hojjat Adeli
Download or read book Mechanics Computing in 1990's and Beyond: Computational mechanics, fluid mechanics, and biomechanics written by Hojjat Adeli and published by . This book was released on 1991 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wave Modeling at the Mouth of the Columbia River by : Sarah Kassem
Download or read book Wave Modeling at the Mouth of the Columbia River written by Sarah Kassem and published by . This book was released on 2012 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the second largest river in the U.S., the entrance to the Columbia River is home to some of the most extreme wave conditions on the Pacific Coast. Winter storms commonly generate waves 6-8 m in height, which in combination with strong tidal currents, can produce dangerous navigation conditions. To improve understanding of the wave dynamics in this complex setting, the SWAN model is applied; 2 hindcasts are conducted and an operations forecast is developed. The model is forced with offshore wave heights obtained from a buoy located in 134 m water depth (for the hindcasts) and a specialized WaveWatchIII forecast (for the forecast). In both cases tidal currents are obtained from SELFE, a circulation model of the Columbia River. The hindcasts are validated through measurements obtained from an inshore buoy located in 25 m water depth, a 4-week field experiment and remote sensing methods. The model performs best at the location of the buoy, with a normalized root-mean-squared error (NRMSE) of 11%, primarily because it is outside the area of strong tidal currents. Within the river mouth, the model is able to predict the changes in the wave field due to currents, but its performance is limited by errors in velocity estimates and strong shears in the tidal current profile. From the modeling work, it is evident that wave transformations at the mouth of the river are dominated by the tidal currents. The forecast has been operational since August 2011 and provides 45-hours of predictive wave information. In comparison with measured wave heights at the buoy, the forecast performs well, with a NRMSE of 16%. The majority of errors are caused by errors in the input conditions, since they themselves are forecasted. Additional errors arise from phase-resolved properties in the wave field that the model is unable to produce; these errors are also present in the hindcasts. Despite the limitations, this forecast provides valuable information to bar pilots since it includes the effects of the tidal currents.
Download or read book Satellite Activities of NOAA written by and published by . This book was released on 1971 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flood Insurance Study by : United States. Federal Insurance Administration
Download or read book Flood Insurance Study written by United States. Federal Insurance Administration and published by . This book was released on 1978 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Environmental Science Information Center. Library and Information Services Division Publisher : ISBN 13 : Total Pages :444 pages Book Rating :4.:/5 (3 download)
Book Synopsis Book Catalog of the Library and Information Services Division: Subject index by : Environmental Science Information Center. Library and Information Services Division
Download or read book Book Catalog of the Library and Information Services Division: Subject index written by Environmental Science Information Center. Library and Information Services Division and published by . This book was released on 1977 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earth Resources written by and published by . This book was released on 1977 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pacific Marine Environmental Laboratory Summary Report Fiscal Year ... by : Pacific Marine Environmental Laboratory (U.S.)
Download or read book Pacific Marine Environmental Laboratory Summary Report Fiscal Year ... written by Pacific Marine Environmental Laboratory (U.S.) and published by . This book was released on 1984 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Report by : Pacific Marine Environmental Laboratory (U.S.)
Download or read book Annual Report written by Pacific Marine Environmental Laboratory (U.S.) and published by . This book was released on 1984 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
