平面波与线性粘弹海底的反射和折射

采用基于广义标准线性体Boltzmann叠加原理的固体流变模型来描述粘弹性海底底质结构,分析了沉积层和基岩的纵、横波速度频散和衰减的特点,计算了海水沉积层界面和沉积层基岩界面位移势反射和折射系数和能量反射和折射系数。结果表明,采取本模型的粘弹性海底的速度频散、衰减和已有文献的实验数据符合较好,能准确的描述海底底质的主要性质,反射和折射系数和声波的频率有关。 

Reflection and refraction of plane wave at a linear viscoelastic ocean bottom

The Boltzmann's superposition principle base on the general standard linear solid theology was implemented the properties of a viscoelastic ocean bottom structure.In addition,the dispersion of sound velocity of longitudinal and transverse wave and attenuation in sediments and basement were analyzed.The displacement potential and intensity coefficients of reflection and refraction were calculated for a seawater-sediments boundary and sediments-basement boundary.The results show that the dispersion and attenuation of a viscoelastic ocean bottom which was described by this model were well accord with experimental data.This model can describe the major properties of a viscoelastic ocean bottom.The reflection and refraction coefficients are related to acoustic wave frequency.