基于海水声吸收的违规抛泥检测

Detection of illegal dumping dredged material based on sound absorption in turbid seawater

为了更便捷、有效地监测港口疏浚船违规倾倒沙泥,提出一种基于海水声吸收特性的非接触式检测方法.在监控水域周期性发送和接收等幅扫频声信号,获取水下信道的频率特性曲线.当疏浚驳船违规倾倒泥沙时,海水中颗粒物质量浓度发生剧变,频率特性曲线也将随之变化,通过检测相邻两次测量曲线的差异性来判断港口疏浚驳船是否存在违规抛泥的行为.建立了混浊海水声吸收系数的计算模型,利用MATLAB软件平台进行了一系列仿真.结果表明所提出方法可有效识别出违规抛沙行为,为进一步的布网设计奠定了基础.

In order to conveniently and effectively monitor illegal dumping by port dredging barges,a non-contact 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.