海底沉积物纵波声速随孔隙度变化的物理机制  

The physical mechanism of the variation of longitudinal wave sound velocity with porosity in submarine sediments

作　　者：李赶先[1] 龙建军[2] LI Ganxian;LONG Jianjun(Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 510301,China;School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]中国科学院边缘海与大洋地质重点实验室、南海海洋研究所、南海生态环境工程创新研究院,广州510301 [2]广东工业大学机电工程学院,广州510006

出　　处：《应用声学》2025年第2期413-422,共10页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(41976180)。

摘　　要：为建立高精度海底沉积物纵波声速预估公式和揭示沉积物纵波声速与相关参数响应机制,通过对海底沉积物测试数据统计分析,研究发现了海底沉积物纵波声速随孔隙度变化的最小值,并用一元二次函数的最小值坐标公式,对该文及众多学者得到的不同海区沉积物纵波声速随孔隙度变化的最小值及其孔隙度临界值进行了统一分析。计算表明,不同海区沉积物纵波声速随孔隙度变化的最小值变动范围在1468.59-1520.22m/s之间,相应孔隙度临界值变动范围在0.69-0.88之间。分析表明,不同学者的经验公式归属于声学理论推导的统一数学表达形式。研究表明,海底沉积物纵波声速随孔隙度变化最小值形成是由沉积物颗粒耦合作用影响纵波传播造成的,进而揭示出海底沉积物的颗粒在海水中的接触或悬浮状态、弹性应变变化等因素影响纵波声速变化的物理机制。In order to establish a high-precision formula for predicting the longitudinal wave sound velocity of seafloor sediments and reveal the response mechanism between the longitudinal wave sound velocity of sed iments and related parameters,through statistical analysis of seafloor sediment test data,the minimum value of the longitudinal wave sound velocity of seafloor sediments with porosity was found,and the minimum coor dinate formula of a univariate quadratic function was used.A unified analysis was conducted on the minimum values and critical porosity values of the variation of longitudinal wave sound velocity with porosity obtained by this article and many scholars in different sea areas.The calculation shows that the minimum variation range of longitudinal wave sound velocity with porosity variation in sediments from different sea areas is between 1468.59 to 1520.22 m/s,and the corresponding critical porosity value variation range is between 0.69 and 0.88.Analysis shows that the empirical formulas of different scholars belong to a unified mathematical expression derived from acoustic theory.Research has shown that the formation of the minimum value of longitudinal wave sound velocity with porosity variation in seafloor sediment is due to the coupling effect of sediment particles on longitudinal wave propagation.This further reveals the physical mechanism by which factors such as the contact or suspension state of seafloor sediment particles in seawater and changes in elastic strain affect the variation of longitudinal wave sound velocity.

关 键 词：海底沉积物 纵波声速 最小值 孔隙度 颗粒悬浮 

分 类 号：P733.23[天文地球—物理海洋学]