海底沉积物上的声反射

Reflection of acoustic waves from marine sediment

本文将海底沉积物视为一种紧密的湿颗粒介质。声波在其中传播时将出现两个膨胀波和一个旋转波。考虑到这些特征，再假设海水与沉积物的界面是平的，导出了平面声波在其上的反射系数的表达式。文中就松散颗粒介质的情况对反射系数进行了简化，得出了前人用唯象理论所获得的结果。文末将理论与实验结果进行了比较，两者的一致性较好。

In this paper, the marine sediment is regarded as a wet granular media. The propagation of sound in wet close granular media can excite two expand waves and a rotation wave. When these characteristics are considered and assume that the interface of sea water and sediment is a plane, the expression of reflection coefficient is derived. In case of the loose granular media, the reflection coefficient is simplifyed the result obtained is identical with that obtained by seniors from phenomenon theory. The theoretical result agrees quite well with the practical data.