Parametric Representation of a Wind-Wave Field

1977 ◽  
Author(s):  
Henrik Rye ◽  
Roald Svee
Keyword(s):  
Wave Field ◽  
Wind Wave ◽  
Parametric Representation

scholarly journals PARAMETRIC REPRESENTATION OF A WIND-WAVE FIELD

1976 ◽  
Vol 1 (15) ◽  
pp. 11 ◽  
Author(s):  
Henrik Rye ◽  
Roald Svee
Keyword(s):  
Wave Field ◽  
Field Data ◽  
Wind Wave ◽  
Parametric Representation ◽  
Rayleigh Distribution ◽  
Spectral Shape ◽  
Height Distribution ◽  
Shape Parameters ◽  
Wave Parameters ◽  
Wave Height Distribution

The applicability of various spectral shape parameters is discussed. The wave .height distribution from 60 actual wave recordings is computed and compared to the Rayleigh distribution. The behaviour of various wave period parameters is discussed. Based on results from field data as well as numerical computations, it is concluded that some of the spectral wave parameters frequently used today may not be suitable for characterizing the wave field.

scholarly journals On Evolution of Young Wind Waves in Time and Space

Atmosphere ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 562 ◽  
Author(s):  
Shemer
Keyword(s):  
Wave Field ◽  
Field Experiments ◽  
Wind Wave ◽  
Wind Waves ◽  
Wave Generation ◽  
Wind Forcing ◽  
Spatial And Temporal Variation ◽  
Extensive Discussion ◽  
Deterministic Theory ◽  
Theoretical Approaches

The mechanisms governing the evolution of the wind-wave field in time and in space are not yet fully understood. Various theoretical approaches have been offered to model wind-wave generation. To examine their validity, detailed and accurate experiments under controlled conditions have to be carried out. Since it is next to impossible to get the required control of the governing parameters and to accumulate detailed data in field experiments, laboratory studies are needed. Extensive previously unavailable results on the spatial and temporal variation of wind waves accumulated in our laboratory under a variety of wind-forcing conditions and using diverse measuring techniques are reviewed. The spatial characteristics of the wind-wave field were determined using stereo video imaging. The turbulent airflow above wind waves was investigated using an X-hot film. The wave field under steady wind forcing as well as evolving from rest under impulsive loading was studied. An extensive discussion of the various aspects of wind waves is presented from a single consistent viewpoint. The advantages of the stochastic approach suggested by Phillips over the deterministic theory of wind-wave generation introduced by Miles are demonstrated. Essential differences between the spatial and the temporal analyses of wind waves’ evolution are discussed, leading to examination of the applicability of possible approaches to wind-wave modeling.

Doppler measurements of the effects of gravity waves on wind-generated ripples

1977 ◽  
Vol 81 (2) ◽  
pp. 225-240 ◽  
Author(s):  
Peter H. Y. Lee
Keyword(s):  
Frequency Shift ◽  
Wave Field ◽  
Gravity Wave ◽  
Gravity Waves ◽  
Wind Wave ◽  
Sampling Technique ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Conditional Sampling ◽  
First Order

The effects of gravity waves on wind-generated ripples are studied experimentally by means of Doppler spectra obtained through microwave Bragg backscattering. The measurements were made at 9·23 GHz with incidence angles of between 45° and 55°. It is found from the Doppler frequency shift that an increase in the speed of Bragg waves (ripples) of wavelength approximately 2 cm can be detected when a gravity wave is propagated into a pre-existing wind-wave field. The Doppler frequency shift corresponds, to first order, to the orbital speed of the gravity wave. Further studies, using a conditional sampling technique, reveal that the Bragg scatterers are localized on the gravity wave's crest. The mechanism leading to the ‘localization’ is as yet unidentified. Ratios of gravity wavelength to Bragg (ripple) wavelength ranging from 13 to 35 have been studied.

Characterizing the signature of a spatio-temporal wind wave field

2018 ◽  
Vol 129 ◽  
pp. 104-123 ◽  
Author(s):  
Alvise Benetazzo ◽  
Filippo Bergamasco ◽  
Jeseon Yoo ◽  
Luigi Cavaleri ◽  
Sun-Sin Kim ◽  
...  
Keyword(s):  
Wave Field ◽  
Wind Wave ◽  
Spatio Temporal

scholarly journals Stress above Wind-Plus-Paddle Waves: Modeling of a Laboratory Experiment

2007 ◽  
Vol 37 (12) ◽  
pp. 2824-2837 ◽  
Author(s):  
V. K. Makin ◽  
H. Branger ◽  
W. L. Peirson ◽  
J. P. Giovanangeli
Keyword(s):  
Stress Distribution ◽  
Laboratory Experiment ◽  
Wave Field ◽  
Stress Level ◽  
Surface Stress ◽  
Wind Wave ◽  
Wind Waves ◽  
Wave Steepness ◽  
Low Level ◽  
Level Characteristic

Abstract A model based on wind-over-waves coupling (WOWC) theory is used to simulate a laboratory experiment and to explain the observed peculiarities of the surface stress distribution above a combined wave field: wind-generated-plus-monochromatic-paddle waves. Observations show the systematic and significant decrease in the stress as the paddle wave is introduced into the pure wind-wave field. As the paddle-wave steepness is further increased, the stress level returns to the stress level characteristic of the pure wind waves. Further increase in the paddle-wave steepness augments the stress further. The WOWC model explains this peculiarity of the stress distribution by the fact that the paddle waves significantly damp the wind waves in the spectral peak. The stress supported by these dominant waves rapidly falls when the paddle wave is introduced, and this decrease is not compensated by the stress induced by the paddle wave. With further increase in the steepness of the paddle wave, the stress supported by dominant wind waves stays at a low level while the stress supported by the paddle waves continues to grow proportional to the square of the steepness, finally exceeding the stress level characteristic of the pure wind-wave field.

Subharmonic transitions and group formation in a wind wave field

1982 ◽  
Vol 87 (C8) ◽  
pp. 5699 ◽  
Author(s):  
E. Mollo-Christensen ◽  
A. Ramamonjiarisoa
Keyword(s):  
Wave Field ◽  
Wind Wave ◽  
Group Formation
Sign in / Sign up

Export Citation Format

Share Document