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平面波与层状多孔介质海底的反射和透射
引用本文:周来江,杨士莪.平面波与层状多孔介质海底的反射和透射[J].声学技术,2010,29(6):559-564.
作者姓名:周来江  杨士莪
作者单位:哈尔滨工程大学水声技术国家级重点实验室;
摘    要:针对典型的海底介质结构情况,研究了从海水入射到含有非固结沉积层的层状流体饱和多孔介质海底的平面波的反射和透射问题,分析了沉积层和基岩中纵、横波速度和衰减的频散变化特点,在沉积层厚度和频率变化时,对海水-海底界面上的位移势函数反射系数进行了计算和分析。研究结果表明:在沉积层厚度一定的情况下,较高频率时,沉积层对海水中声场的影响较大,而频率较低时,基岩对海水中声场的影响较大。在以不同的掠射角入射时,由于沉积层中质点的法向共振,广义位移势函数反射系数随频厚积的变化曲线会出现一系列的共振峰,随着掠射角的减小,共振峰个数减少,但共振峰的幅度会增加。

关 键 词:非固结沉积层  流体饱和多孔介质  频厚积  共振峰

Plane-wave reflection and transmission of a stratified porous medium ocean bottom including unconsolidated sediments
ZHOU Lai-jiang,YANG Shi-e.Plane-wave reflection and transmission of a stratified porous medium ocean bottom including unconsolidated sediments[J].Technical Acoustics,2010,29(6):559-564.
Authors:ZHOU Lai-jiang  YANG Shi-e
Institution:ZHOU Lai-jiang,YANG Shi-e(National Laboratory of Underwater Acoustic Technology,Harbin Engineering University,Harbin 150001,China)
Abstract:Reflection and transmission of inclined incident plane-wave from seawater to a stratified fluid-saturated porous medium ocean bottom including unconsolidated sediments is studied based on the typical ocean bottom me-dium.The dispersion of sound velocity and attenuation of longitudinal and transverse wave in unconsolidated sediments and fluid-saturated porous medium basement are analyzed.Attention is focused on the effect of frequency-thickness products variation on the reflection coefficient of displacement...
Keywords:unconsolidated sediments  fluid-saturated porous medium  frequency-thickness products  formants  
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