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THE RECOGNITION OF THE SEABED REFLECTION SIGNALAND THE AUTOMATIC PICKUP OF SEABED TOPOGRAPHYFROM THE ORIGINAL DATA OF SUBBOTTOM PROFILE |
LIU Xiujuan 1, GAO Shu 2, ZHAO Tiehu 3 |
1. Faculty of Resources, China University of Geosciences, Wuhan 430074, China; 2. Key Laboratory for Coast and Island Development of the Ministry of Education, Nanjing University, Nanjing 210093, China; 3. Qingdao Institute of Marine Geology, Qingdao 266071, China |
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Abstract Data acquired in December 2004 by GeoChirpⅡsubbottom profiler in the South Channel of the Changjiang Estuary displays maximum amplitude round the seafloor and small signalnoise ratio of the acoustic record. In terms of the features of acoustic record reflected by the seafloor, the sampling area including the seabed is determined in the figure of the profile. Then the method of amplitude is adopted to implement the recognition of the seabed reflection signal and the automatic pickup of seabed topography. Finally, the seafloor picked up is smoothed. The method mentioned above was used to process the data acquired from the South Channel of the Changjiang Estuary. Compared with the original seabed topography, the seafloor picked up automatically demonstrates the rhythm of undulate seafloor, indicating that this method is effective in the recognition of the seabed reflection signal and the automatic pickup of seabed topography.
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Received: 18 December 2008
Published: 02 December 2009
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