| 李赶先,龙建军.海底沉积物纵波声速随孔隙度变化的物理机制*[J].,2025,44(2):413-422 |
| 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 sedments |
| 投稿时间：2023-10-13 修订日期：2025-02-27 |
| 中文摘要: |
| 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,对本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临界孔隙度值进行了统一分析。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1468.59-1520.22 m/s之间,相应临界孔隙度值变动范围在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原因是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。 |
| 英文摘要: |
| 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 sediments 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 coordinate 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. |
| DOI：10.11684/j.issn.1000-310X.2025.02.016 |
| 中文关键词: 海底沉积物 纵波声速 最小值 孔隙度 颗粒悬浮 |
| 英文关键词: Seabed sediments Longitudinal wave velocity Minimum value Porosity Particle suspension |
| 基金项目:国家自然科学基金项目(41976180)。 |
|
| 摘要点击次数: 29 |
| 全文下载次数: 23 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
