| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Influence of Breaking Waves and Wake Bubbles on Surface-Ship Wake Scattering at Low Grazing Angles |
| Xiao-Xiao Zhang1, Zhen-Sen Wu1**, Xiang Su2 |
1School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071
2China Academy of Space Technology (Xi'an), Xi'an 710100
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| Cite this article: |
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Xiao-Xiao Zhang, Zhen-Sen Wu, Xiang Su 2018 Chin. Phys. Lett. 35 074101 |
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Abstract A surface-ship wake model is proposed for calculating the scattering of ship wake from a nonlinear sea surface at a high sea state. Ship waves are simulated based on the Kelvin wave model by the point-source method. A Creamer II sea surface based on the Elfouhaily sea spectrum is generated, and breaking waves and foam layer effects are taken into account for the background sea scattering at slight, moderate and high wind speeds. Turbulent bubbles scattering from the ship, which is different from wind-driven bubble breaking, is taken into account with a different concentration distribution using a polynomial fitting function combined with measured data. The surface-ship wake scattering is presented for different wind speeds. Numerical simulations show that ship wake scattering results will be higher when wake bubbles are taken into account. The ship beam is a key parameter that influences the width of the turbulent wake, and results in different scattering characteristics on the scattering image. The wind-induced surface in the presence of breaking waves and whitecaps results in scattering enhancement. This will cause the ship wake signal to be submerged in the back-ground of sea noise, leading to false alarms.
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Received: 08 April 2018
Published: 24 June 2018
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| PACS: |
41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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84.40.Xb
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(Telemetry: remote control, remote sensing; radar)
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91.50.Iv
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(Marine magnetics and electromagnetics)
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 61571355. |
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