scholarly journals Research on wave height cross-sections of UHF radio wave scattering from periodic water surface waves

2019 ◽  
Vol 16 (14) ◽  
pp. 20190344-20190344
Author(s):  
Yan Tu ◽  
Biyang Wen ◽  
Chaonan Liu
Keyword(s):  
Surface Waves ◽  
Radio Wave ◽  
Wave Height ◽  
Cross Sections ◽  
Wave Scattering ◽  
Water Surface

scholarly journals Research on cross section of UHF radio wave scattering from surface waves on water

2016 ◽  
Vol 13 (20) ◽  
pp. 20160898-20160898 ◽  
Author(s):  
Yan Tu ◽  
Biyang Wen ◽  
Ke Li ◽  
Jing Yang
Keyword(s):  
Surface Waves ◽  
Radio Wave ◽  
Cross Section ◽  
Wave Scattering

scholarly journals The Close Relationship between Internal Wave and Ocean Free Surface Wave

2021 ◽  
Vol 9 (12) ◽  
pp. 1330
Author(s):  
Bang-Fuh Chen ◽  
Yi-Jei Huang
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Internal Wave ◽  
Surface Waves ◽  
Wave Height ◽  
Water Surface ◽  
Simple Method ◽  
Wave Signal ◽  
Close Relationship ◽  
Free Surface Wave

A numerical model was used to simulate the propagation of internal waves (IW) along the surface layer. The results show that strong water exchange during IW propagation results in strong free surface flow and produces small but distinct free surface waves. We found a close relationship between the internal and ocean surface waves. Our intuitive reaction is that by training the relationship between the water surface wave height and the internal wave waveform, the internal wave waveform can be reversed from the water surface wave height value. This paper intends to validate our intuition. The artificial neural network (ANN) method was used to train the Fluent simulated results, and then the trained ANN model was used to predict the inner waves below by the free surface wave signal. In addition, two linear internal wave equations (I and II) were derived, one based on the Archimedes principle and the other based on the long wave and Boussinesq approximation. The prediction by equation (II) was superior to the prediction of equation (I), which is independent of depth. The predicted IW of the proposed ANN method was in good agreement with the simulated results, and the predicted quality was much better than the two linear wave formulas. The proposed simple method can help researchers infer the magnitude of IW from the free surface wave signal. In the future, the spatial distribution of IW below the sea surface might be obtained by the proposed method without costly field investigation.

Remote Sensing of Sea Surface Wave by Using CW X-Band Microwave Doppler Radar at Sagami-Bay

2008 ◽  
Author(s):  
Chang-Kyu Rheem
Keyword(s):  
Surface Waves ◽  
Wave Height ◽  
Water Surface ◽  
Doppler Radar ◽  
Sea Surface ◽  
Surface Elevation ◽  
Sagami Bay ◽  
Water Surface Elevation ◽  
Water Particle ◽  
Sea Surface Waves

Sea surface waves had been observed remotely by using a continuous wave (CW) X-band microwave Doppler radar at the off Hitatsuka of Sagami-bay in Japan. A new algorithm was applied to retrieve sea surface elevation from radar output Doppler signals. The sea surface waves observed by the microwave Doppler radar had been compared with the waves measured by a supersonic wave height meter. There were good correlations in both the wave height and the wave period between the waves observed by the microwave Doppler radar and that measured by a supersonic wave height meter. The correlation of wave heights was better than that of wave periods. The microwave irradiation width on sea surface does a role of space filter. It seems that the filtering effect is a kind of aliasing, the energy of short wavelength waves moves to low wave number region. The algorithm to retrieve a sea surface elevation is described by the relation of the water surface elevation and the orbital velocity of water particle on water surface that generated by water surface waves. A linear superposition method has been used to retrieve sea surface elevation. No empirical parameters are used in the algorithm, because the water surface elevation can be obtained from the water particle velocity on water surface by using the mathematical relation of the water surface elevation and the orbital motion of water particle. Water particle motion on sea surface is affected by sea surface wind, currents, and sea surface waves. Water particle motion generated by sea surface waves can be separated by the difference of the fluctuation scale of each physical process.

scholarly journals Crown’s anisotropy of a tree and scattering the signals of navigation satellites frequency band L1

2020 ◽  
Vol 149 ◽  
pp. 02005
Author(s):  
Vladimir Podoprigora ◽  
Anotoly Sorokin ◽  
Daniil Makarov ◽  
Dmitry Kharlamov
Keyword(s):  
Dielectric Constant ◽  
Radio Wave ◽  
Cross Section ◽  
Frequency Band ◽  
Cross Sections ◽  
Wave Scattering ◽  
Navigation Satellite ◽  
Tree Crown ◽  
Orientational Ordering ◽  
Scattering Cross Sections

The model of interaction of signals from navigation satellites with the tree crown is considered. The contribution of the anisotropy of the dielectric constant to the cross section of radio wave scattering due to the orientational ordering of the branches is shown. The calculation of the scattering cross sections for small and large elements is presented. The tensor of orientational ordering of tree branches with division into tiers differing in the size and orientation of elements is introduced. Test measurements of navigation satellite signals passed through the crowns of spruce trees were carried out.

scholarly journals Localization of water surface waves in a heterostructure channel with corrugated sidewalls

AIP Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 015336
Author(s):  
Jia-Yi Zhang ◽  
Ting Liu ◽  
Jia Tao ◽  
Ya-Xian Fan ◽  
Zhi-Yong Tao
Keyword(s):  
Surface Waves ◽  
Water Surface

Action of an adverse current on the shape of deep water surface waves

1995 ◽  
Vol 18 (6) ◽  
pp. 438-444 ◽  
Author(s):  
P. Bonmarin ◽  
F. Bartholin ◽  
A. Ramamonjiarisoa
Keyword(s):  
Surface Waves ◽  
Deep Water ◽  
Water Surface

scholarly journals Radio wave scattering in the outer heliosphere

2000 ◽  
Vol 105 (A3) ◽  
pp. 5149-5156 ◽  
Author(s):  
J. W. Armstrong ◽  
W. A. Coles ◽  
B. J. Rickett
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Outer Heliosphere

scholarly journals Non‐Gaussian Radio‐Wave Scattering in the Interstellar Medium

2006 ◽  
Vol 640 (1) ◽  
pp. 344-352 ◽  
Author(s):  
Stanislav Boldyrev ◽  
Arieh Konigl
Keyword(s):  
Interstellar Medium ◽  
Radio Wave ◽  
Wave Scattering ◽  
Non Gaussian
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