| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Three-Dimensional Mode Coupling around a Conical Seamount and the Use of Random Discretization |
| LUO Wen-Yu1**, SCHMIDT Henrik2 |
1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190
2Department of Mechanical Engineering, Massachusetts Institute of Technology, Massachusetts 02139, USA
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| Cite this article: |
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LUO Wen-Yu, SCHMIDT Henrik 2010 Chin. Phys. Lett. 27 114302 |
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Abstract Three-dimensional mode coupling around a conical seamount in an ocean waveguide is studied. It is shown that strong mode coupling occurs at the edge of a conical seamount for the incident normal modes with significant amplitudes below the top of the seamount. Therefore, mode coupling is critical for the investigation of the acoustic field around a seamount. In addition, we suggest the use of random discretization for representing smoothly varying bathymetry. For the use of uniform discretization, when the horizontal step size is greater than half of the wavelength, artificial diffraction lobes appear due to coherent backscatter. However, by using the random discretization scheme instead, such artificial diffraction lobes are diffused, resulting in a faster convergence rate.
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| Keywords:
43.30.Bp
43.30.Gv
43.20.Fn
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Received: 29 June 2010
Published: 22 October 2010
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| PACS: |
43.30.Bp
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(Normal mode propagation of sound in water)
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43.30.Gv
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(Backscattering, echoes, and reverberation in water due to combinations of boundaries)
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43.20.Fn
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(Scattering of acoustic waves)
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