scholarly journals DIRECTIONAL SPECTRA IN CURRENT-DEPTH REFRACTION

1986 ◽  
Vol 1 (20) ◽  
pp. 19
Author(s):  
F. Hirosue ◽  
T. Sakai
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Water Depth ◽  
Wave Reflection ◽  
Wave Spectra ◽  
Relative Importance ◽  
View Point ◽  
Wave Direction ◽  
Direction Change ◽  
Directional Wave

According to Brink-Kjaer et al.'s discussion(1984), the expression of the wave direction change velocity is modified in our numerical model for the directional wave spectra change due to current-depth refraction (Sakai et al., 1983). The wave reflection and breaking conditions due to current are discussed from a view point of numerical analysis. Effects of the refraction term in the modified wave action equation on the directional spectra change are examined. The relative importance of current and water depth change in the directional spectra change is also examined.

scholarly journals COMBINED REFRACTION-DIFFRACTION CALCULATIONS WITH DIRECTIONAL WAVE SPECTRA

1984 ◽  
Vol 1 (19) ◽  
pp. 71 ◽  
Author(s):  
P. Gaillard
Keyword(s):  
Water Depth ◽  
Arbitrary Shape ◽  
Wave Spectrum ◽  
Wave Spectra ◽  
Combined Effects ◽  
Random Waves ◽  
Method Of Calculation ◽  
Wave Refraction ◽  
Directional Wave

A method of calculation of the combined effects of wave refraction, diffraction and reflection in harbours of arbitrary shape and non uniform water depth, subject to periodic or random waves is presented. Examples of application are given and practical aspects on the wave spectrum discretisation are considered.

scholarly journals A Method to Estimate Reflection and Directional Spread Using Rotary Spectra from Accelerometers on Large Ice Floes

2017 ◽  
Vol 34 (5) ◽  
pp. 1125-1137 ◽  
Author(s):  
Graig Sutherland ◽  
Jean Rabault ◽  
Atle Jensen
Keyword(s):  
Sea Ice ◽  
Length Scale ◽  
Wave Spectra ◽  
Robust Method ◽  
Wave Direction ◽  
Wave Dissipation ◽  
Model Free ◽  
Directional Wave ◽  
The Mean ◽  
Ice Floes

AbstractThe directional wave spectra in sea ice are an important aspect of wave evolution and can provide insights into the dominant components of wave dissipation, that is, dissipation due to scattering or dissipation due to viscous processes under the ice. A robust method for the measurement of directional wave spectra parameters in sea ice from a three-axis accelerometer—or a heave, pitch, and roll sensor—is proposed. The method takes advantage of certain aspects of sea ice and makes use of rotary spectra techniques to provide model-free estimates for the mean wave direction, directional spread, and reflection coefficient. The method is ideally suited for large ice floes—that is, where the ice floe length scale is much greater than the wavelength—but a framework is provided to expand the parameter space where the method may be effective.

Estimation of Onsite Wave Parameters From the WindFloat Platform

2013 ◽  
Author(s):  
Antoine Peiffer ◽  
Nathan Tom ◽  
Christian Cermelli ◽  
Dominique Roddier
Keyword(s):  
Wave Spectra ◽  
Wave Direction ◽  
Wave Statistics ◽  
Wave Measurements ◽  
Wave Parameters ◽  
Floating Foundation ◽  
Wave Elevation ◽  
Many Instruments ◽  
Directional Wave ◽  
Buoy Measurements

The WindFloat is a semi-submersible floating foundation supporting multi-megawatt wind turbines. A full-scale 2MW WindFloat demonstration unit was installed off the coast of Portugal in October 2011. Many instruments are installed on this prototype to measure the environmental conditions and the response of the platform at the site. The first section of the paper focuses on the validation of the wave measurements obtained from two radar-based wave probes onboard the platform. The wave elevation at the site is reconstructed and typical wave statistics are computed. The results are compared and validated with independent buoy measurements close to site. The second section of the paper presents estimates of prevailing wave direction and directional wave spectra based on platform motions. These results are also benchmarked with onsite buoy measurements.

Multi-peaked directional wave spectra based on extensive field measurement data in the Gulf of Oman

2021 ◽  
Vol 230 ◽  
pp. 109057
Author(s):  
Mohammad Adibzade ◽  
Mehdi Shafieefar ◽  
Hassan Akbari ◽  
Roozbeh Panahi
Keyword(s):  
Field Measurement ◽  
Measurement Data ◽  
Wave Spectra ◽  
Gulf Of Oman ◽  
Extensive Field ◽  
Directional Wave
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