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| Detection of illegal dumping dredged material based on sound absorption in turbid seawater |
| 1.Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, Xiamen University, Xiamen, Fujian 361005, China; 2.Security Management ＆ Technological Innovation and Information Department, Xiamen Port Authority,Xiamen, Fujian 361005, China |
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Abstract In order to conveniently and effectively monitor illegal dumping by port dredging barges, a noncontact detection method was proposed based on seawater sound absorption characteristics. Acoustic signals of constant amplitudes sweep were sent and received periodically in the monitored area, and the frequency characteristic curves of underwater channel were obtained from the received signal. When the dredging barge dumped sediment, the particle concentration in seawater was changed drastically accompanying with the changing of frequency characteristic curve. The illegal dumping could be detected by comparing the difference of the adjacent curves. Computational model of sound absorption coefficient in turbid seawater was established, and a series of simulations of MATLAB were completed. The results show that the proposed method can effectively identify the offending behavior of throwing sand, which provides the foundation for the further distribution network design.
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Received: 09 December 2013
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2014, Vol. 35 
