Choi Jee Woong, Dahl Peter H, Goff John A
J Acoust Soc Am. 2008 Sep;124(3):EL128-34. doi: 10.1121/1.2963048.
Acoustic bottom-interacting measurements from the Shallow Water '06 experiment experiment (frequency range 1-20 kHz) are presented. These are co-located with coring and stratigraphic studies showing a thin (approximately 20 cm) higher sound speed layer overlaying a thicker (approximately 20 m) lower sound speed layer ending at a high-impedance reflector (R reflector). Reflections from the R reflector and analysis of the bottom reflection coefficient magnitude for the upper two sediment layers confirm both these features. Geoacoustic parameters are estimated, dispersion effects addressed, and forward modeling using the parabolic wave equation undertaken. The reflection coefficient measurements suggest a nonlinear attenuation law for the thin layer of sandy sediments.
本文展示了来自“浅海’06实验”（频率范围为1 - 20千赫）的与海底相互作用的声学测量结果。这些测量与取芯和地层学研究在同一地点进行，研究表明存在一个薄的（约20厘米）高声速层，其覆盖在一个较厚的（约20米）低声速层之上，该低声速层终止于一个高阻抗反射体（R反射体）。来自R反射体的反射以及对上部两层沉积物底部反射系数幅值的分析证实了这两个特征。估算了地球声学参数，探讨了频散效应，并使用抛物波方程进行了正演模拟。反射系数测量结果表明，砂质沉积物薄层存在非线性衰减规律。
