scholarly journals Directional Spreading Function of the Gravity-Capillary Wave Spectrum Derived from Radar Observations

2017 ◽  
Vol 9 (4) ◽  
pp. 361 ◽  
Author(s):  
Xuan Zhou ◽  
Jinsong Chong ◽  
Haibo Bi ◽  
Xiangzhen Yu ◽  
Yingni Shi ◽  
...  
Keyword(s):  
Capillary Wave ◽  
Wave Spectrum ◽  
Radar Observations ◽  
Spreading Function

MST Radar Observations of a Saturated Gravity Wave Spectrum

1989 ◽  
Vol 46 (15) ◽  
pp. 2440-2447 ◽  
Author(s):  
T. Tsuda ◽  
T. Inoue ◽  
S. Kato ◽  
S. Fukao ◽  
D. C. Fritts ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Wave Spectrum ◽  
Radar Observations ◽  
Mst Radar

scholarly journals Capillary wave spectrum at adsorbed liquid films

2012 ◽  
Vol 86 (8) ◽  
Author(s):  
Eva M. Fernández ◽  
Enrique Chacón ◽  
Pedro Tarazona
Keyword(s):  
Capillary Wave ◽  
Wave Spectrum ◽  
Liquid Films

On the spectra of high-frequency wind waves

1982 ◽  
Vol 123 ◽  
pp. 165-185 ◽  
Author(s):  
Hsien-Ta Liu ◽  
Jung-Tai Lin
Keyword(s):  
Frequency Response ◽  
Capillary Wave ◽  
Wind Waves ◽  
Wave Spectrum ◽  
Field Of View ◽  
Quasi Equilibrium ◽  
Wave Regime ◽  
Wind Speeds ◽  
Equilibrium Spectrum ◽  
Low Amplitude

Displacements of wind waves in the laboratory were measured with a laser displacement gauge, a recent,ly developed, optical, non-intrusive sensor, which avoids the meniscus effect's that severely limit the frequency response of conventional thin- wire gauges. The new gauge is a digital device, which has a maximum frequency response of 2.5 kHz. Its spatial resolution, which depends on the field of view, is t,ypically 0.016 cm for a 4 cm field of view. The wind-wave displacements were measured at several fetches for three wind speeds. Wave-variance spectra derived from these measurements indicate the presence of a quasi-equilibrium spectrum in the capillary-wave regime. The quasi-equilibrium spectrum follows an $f^{-\frac{7}{3}}$ power law that has been predicted on dimensional grounds. The spect'ral density increases with increasing wind speed from 4 to 10 m/s but is independent of the fetch from 3 to 5 m. In addition, the capillary-wave spectrum is practically unchanged when a, relatively long but. low-amplitude mechanical wave is superposed onto the wind- generat'cd waves.

scholarly journals DIFFRACTION DIAGRAMS FOR DIRECTIONAL RANDOM WAVES

1978 ◽  
Vol 1 (16) ◽  
pp. 35 ◽  
Author(s):  
Yoshimi Goda ◽  
Tomotsuka Takayama ◽  
Tasumasa Suzuki
Keyword(s):  
Wave Diffraction ◽  
Spectral Characteristics ◽  
Wave Spectrum ◽  
Standard Form ◽  
Random Wave ◽  
Random Waves ◽  
Directional Spectrum ◽  
Spreading Function ◽  
Wave Heights ◽  
Directional Wave

Conventional wave diffraction diagrams often yield erroneous estimation of wave heights behind breakwaters in the sea, because they are prepared for monochromatic waves while actual waves in the sea are random with directional spectral characteristics. A proposal is made for the standard form of directional wave spectrum on the basis of Mitsuyasu's formula for directional spreading function. A new set of diffraction diagrams have been constructed for random waves with the proposed directional spectrum. Problems of multi-diffraction and multi-reflection within a harbour can also be solved with serial applications of random wave diffraction.

scholarly journals Wave Loads and Motions of Long Structures in Directional Seas

1987 ◽  
Vol 109 (2) ◽  
pp. 126-132 ◽  
Author(s):  
M. Isaacson ◽  
O. U. Nwogu
Keyword(s):  
Wave Train ◽  
Wave Spectrum ◽  
Numerical Procedure ◽  
Reduction Factor ◽  
The Body ◽  
Response Ratio ◽  
Wave Loads ◽  
Force Reduction Factor ◽  
Spreading Function ◽  
Wave Directionality

The present paper deals with the effects of wave directionality on the loads and motions of long structures. A numerical procedure based on Green’s theorem is developed to compute the exciting forces and hydrodynamic coefficients due to the interaction of a regular oblique wave train with an infinitely long, semi-immersed floating cylinder of arbitrary shape. The linear transfer function approach is used to determine the wave loads and motions of a structure of finite length in short-crested seas. The effect of wave directionality is expressed as a frequency-dependent, directionally averaged reduction factor for the wave loads and a response ratio for the body motions. Numerical results are presented for the force reduction factor and response ratio of a long floating box subject to a directional wave spectrum with a cosine-power-type energy spreading function.

Millimetre-wave spectrum of the Ar-CO complex: the K = 2 ← 1 and 3 ← 2 subbands

1997 ◽  
Vol 92 (2) ◽  
pp. 229-236 ◽  
Author(s):  
M. HEPP ◽  
R. GENDRIESCH ◽  
I. PAK ◽  
Y.A. KURITSYN ◽  
F. LEWEN ◽  
...  
Keyword(s):  
Wave Spectrum ◽  
Millimetre Wave

The Features of Radar Observations of Snow Cover from Space-Borne Carriers

2007 ◽  
Vol 66 (12) ◽  
pp. 1133-1141
Author(s):  
S. Ye. Yatsevich ◽  
V. B. Yefimov ◽  
I. A. Kalmykov
Keyword(s):  
Snow Cover ◽  
Radar Observations
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