基于波数积分的点声源海底地震波计算方法研究  

An Algorithm for Seismic Wave on Seafloor Caused by Low Frequency Point Sound Source Based on Wave-number Integration Technique

作　　者：卢再华[1] 张志宏[1] 顾建农[1] 

机构地区：[1]海军工程大学理学院,武汉430033

出　　处：《武汉理工大学学报（交通科学与工程版）》2011年第1期118-121,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国防基金项目(批准号:51303030501);海军工程大学自然科学基金项目资助

摘　　要：将舰船地震波简化为液固多层半无限空间低频点声源引起的地震波动问题,基于波数积分方法,通过FFP数值积分求解了海底表面声压、位移和加速度幅值,得到了海底表面声压、位移和加速度的频率特性曲线.对硬质和软质两种海底条件下远场海底地震波信号特征的分析结果表明:随频率增大,海底表面声压的传播损失逐渐增加;软质海底的位移、加速度总体上比硬质海底大;和硬质海底相比,软质海底更有利于声源较低频率成分的传播.The ship seismic wave is simplified to the seismic wave generated by a low frequency point sound source in a liquid-solid multi-layered half-space in this paper.Based on the wave-number integration technique,the amplitudes of acoustic pressure,displacement and acceleration on seafloor are obtained by FFP numerical evaluation technique.The characteristics of acoustic pressure,displacement and acceleration on seafloor varied with frequency are also discussed.According to calculating results,the transmission loss of acoustic pressure on seafloor decreases while frequency increasing.The displacement and acceleration of soft seabed are generally larger than that of hard seabed.Comparatively,soft seabed is advantageous for transmission of low frequency part of sound source.

关 键 词：波数积分 点声源 地震波 声压 位移 加速度 

分 类 号：P631.4[天文地球—地质矿产勘探]