analysis of directional wave spectra from current and pressure measurements

Analysis of directional wave spectra from current and pressure measurements by Li-hwa Lin Download PDF EPUB FB2

Techniques are developed to estimate directional wave spectra from point measurements made by non-stationary wave sensors. Examples of data sources are: (1) several freely drifting small wave buoys potentially deployed from aircraft, and (2) one or more wave measuring Autonomous Underwater Vehicles (AUV's) moving in programmed paths.

A dimensional analysis, based upon the idea of an equilibrium range in the wave spectrum, shows that for large values of the frequency ω, the spectrum Φ(ω) is of the form $\Phi (\omega) \sim.

An approach for modelling of multipeaked directional wave spectra is proposed. For model identification, a numerical optimization technique that uses. Wave Pressure Gauge Analysis with Current Journal of Waterway, Port, Coastal, and Ocean Engineering October The Influence Evaluation of the Noise for the Directional Wave Spectrum Estimated from HF Radar Received Signal.

• Wave energy spectra (non-directional and directional) • Water-column height (Tsunami Detection) • Relative humidity • Ocean current velocity • Precipitation • Salinity • Solar radiation • Visibility • Water level and water quality.

The NDBC, IOOS, NOS, and MMS network is comprised of sites offshore and along. Evaluation of WaMoS II Wave Data / Katrin Hessner, Konstanze Reichert, Jurgen Dittmer, Jose Carlos Nieto Borge, Heinz Gunther --Directional Spectra of Short Sea Waves and Comparison with Microwave Backscatter / Nicole Suoja Tervalon --Remote Sensing of Shallow Water Breaking Waves / Merrick C.

Haller, David R. Lyzenga --Determination of. @article{osti_, title = {Directional ocean wave measurements in a coastal setting using a focused array imaging radar}, author = {Frasier, S J and Liu, Y and Moller, D and McIntosh, R E and Long, C}, abstractNote = {A unique focused array imaging Doppler radar was used to measure directional spectra of ocean surface waves in a nearshore experiment performed on.

The paper includes an extensive analysis of full-scale measurements for which the directional wave spectra are estimated by the two ship response-based methods. Hence, comparisons are made between these estimates and, moreover, the agreement with the corresponding directional wave spectra produced by the wave radar system WAVEX is by: 3 Design wave specification 69 Introduction 69 Short-term wave statistics 69 Time domain analysis 69 Frequency domain analysis 75 Directional wave spectra 78 Wave energy spectra, the JONSWAP spectrum 80 Bretschneider spectrum 82 Pierson–Moskowitz spectrum 83 JONSWAP spectrum 84 Swell waves 85File Size: 5MB.

6 Water Level and Groundwater Flow Measurements A more frequently way used to attain wave direction is to combine one pressure sensor with a current meter similar to those described in Sections () and ().

directional wave spectra, buoy pitch and roll time series are measured and the buoy. The measurement of the directional wave spectrum in oceans has been done by different approaches, mainly wave-buoys, satellite imagery and radar technologies; these methods, however, present some inherent drawbacks, e.g., difficult maintenance, low resolution around areas of interest and high by: 3.

Today, marine radar image sequences are operationally used to determine two-dimensional wave spectra 5 and significant wave height. 6 Furthermore, marine radars have been used to measure individual waves, 7 wave groups, 8 near-surface currents, 9 bathymetry, 10 bathymetry and current in combination, as well as monitoring of surface Cited by: 8.

Using wavelet spectrum analysis to resolve breaking events in the et al., ), where a method of nonstationary analysis of directional spectra was developed and shown to be able to Short-wave measurements by a fixed tower-based and a drifting buoy system.

IEEE J. Oceanic Eng., 19, 10–22, Statistics and Spectral Analysis of Wind-Waves. Expertimental Measurements of Water Waves in the Open Sea, Measurements Using Wave Gauges Array and Pressure Gauges Array.

Experiments Will Be Accompanied by Qualitative Observations of Surface Drift and Orbital Motions. Boussinesq and Kdv Equations. Wave-Current Interactions.

Current-wave spectra coupling project. Volume I. Hurricane fields and cross sections, surface winds and currents, significant waves and wave spectra for potential OTEC sites: (A) Keahole Point, Hawaii, year hurricane; (B) Punta Tuna, Puerto Rico, year hurricane; (C) New Orleans, Louisiana, year hurricane; (D) West Coast of Florida, year hurricane; and for.

Get this from a library. Ocean wave measurement and analysis: proceedings of the fourth international symposium, WAVES September, San Francisco, California. [Billy L Edge; J Michael Hemsley; Coasts, Oceans, Ports and Rivers Institute (American Society of Civil Engineers); American Society of Civil Engineers.;] -- Annotation >This two-volume set contains.

Techniques for computing wave frequency-direction spectra are evaluated using wave buoy data recorded on the North West Shelf of Australia. Frequency-direction spectra are computed by each of four techniques and compared with the wave directionality expected at the measurement location, based on the meteorological conditions prevailing at the by: 7.

Abstract. Understanding the hydrodynamics of waves and the wave energy resource is fundamental to the good design of wave energy converters. The wave energy resource can be defined by its temporal, directional and spectral characteristics, although many representations of the wave energy resource result in the removal of this information, with a Cited by: 3.

Improved Source Term Formulation for Improved Evolutionary Characteristics of Directional Spectra. Office of Naval Research. Project contract amount of $Northeast Florida and Georgia Storm Surge Study. FEMA. Observations of the directional spectra of seabed motion in shallow water were conducted off the New Jersey coast during the summer of Using a six‐point ocean‐bottom seismometer array, each instrument supporting a pressure transducer, and two horizontal and vertical accelerometers, measurements of gravity and seismic waves across the ULF/VLF band were Cited by:.

Waves in Oceanic and Coastal Waters describes the observation, analysis and prediction of wind-generated waves in the open ocean, in shelf seas, and in coastal regions with islands, channels, tidal flats and inlets, estuaries, fjords and lagoons.

Most of this richly illustrated book is devoted to the physical aspects of by: Observations of the wave elevation, pressure and three components of velocity have been made at different depths from a tower in the Adriatic Sea near Venice in a water depth of 16 m. The spectral analysis of the pressure measurements show significant differences from linear wave theory which depend on the wavelength and depth of the by:   Roll papers of pressure records were also photo-electronically treated to yield primitive data of frequency wave spectra.

3) In the s and afterwards, improvements have been made in the wave recorders and the equipment for spectral analysis, and the database of frequency wave spectra was gradually by: 6.