软固态海底的复有效深度近似

Complex effective depth approximation for soft solid bottom

引用Zhang和Tindle的更有效深度的概念；将Chapman提出的浅海Pekeris波导的海底（实）有效深度近似，推广到复有效深度近似，其实部和虚部分别反映平面波反射的相位变化和能量损失。通过对比计算表明：由复有效深度近似构成的均匀声场，能反映对应于小掠角的低号简正波的声学特性，有效地计算浅海远距离声场．有关结论可以推广到包含两层软固态海底的波导之中．

In this paper, Zhang and Tindle's concept of the complex effective depth is cited, and the approximate equation of Chapman's (real)effective depth for Pekeris guide is extended to the complex effective depth approximation whose real and imaginary part explicates the phase change and energy loss on reflection. It is shown that the homogeneous acoustic field, which comprises the complex effective depth approximation, closely reproduces the character of low modes at small grazing angle, and calculates effectively the acoustic field at longer ranges in shallow water. Application of the complex effective depth approximation can be extended to bottoms having two soft solid layers.