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Elimination of Wind Wave Effects on Sub-Bottom Profiler Record

China Ocean Engineering 2007年第2期21卷 355-362页

作者：刘秀娟高抒杨旸 Key Laboratory for Coast and Island Development of the Ministry of Education Nanjing University

With the presence of wind waves, the swaying of survey vessel may effect the quality of sub-bottom profiler records and, therefore, it is necessary to correct the distortions induced by wave action. A major issue is to distinguish wind wave effect and real bedforms such as sand waves. In this paper, a bandstop filter is designed according to the frequency features of wind wave effect to treat the distortion of seabed topography by wind waves. The technique is used to correct the sub-bottom profile in order to eliminate the wave-induced distortions for the sub-bottom profile records from the Yangtze Estuary. This study shows that the undulate seabed record is resulted from wave action, rather than the presence of sand waves, and the filtration technique helps to eliminate the wave effect and recover the real morphology of seabed and the sediment sequence underneath. In addition, a method for data processing is proposed for the case that the record indeed represents a combination of wave effects and real bedforms.

关键词： sub-bottom profiler wind wave effect filtering method Yangtze Estuary

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The research of near field acoustical holographic imaging method

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Chinese Journal of Acoustics 1993年第1期12卷 38-46页

作者： ZHANG Dejun, XIA Xianhua, YAN Jing CHENG Jianzheng, WANG Qun, ZHU Nianqiu(Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan, 430071)

This paper reviews the theoretical analysis of the imaging method and characteristic of the Nearfield Acoustical Holography (NAH). We present a new filtering method, least squares method for filtering with restraint, which improves the stability of the reconstruction. The computer simulation experiment for the vibration and radiation of a round plate by means of the numerical method of NAH has been done and the effect of the new filtering method has been verified. The NAH imaging of radiation of a small loudspeaker using a scanning linear receiving array of 32 elements has been made and the preliminary results are given in the paper.

关键词： Acoustic holographic filtering method Least square method.

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