水波在软淤泥底床上的衰减

本文研究了二层流体系统中波浪的衰减。上层为理想流体，下层为粘弹性Ｖｏｉｇｔ体。导出了色散关系，计算了波浪衰减系数。对于粘性或弹性很大或很小的情况，导出了各种水深情况下近似的显式的衰减系数表示式。与精确的数值结果比较，近似程度很好。可供工程设计参考、使用。

THE WAVE ATTENUATION ON MUD BED

In this paper,the wave attenuation in a two-layer fluid system is studied. The fluid in up layer is ideal and the lower layer is the Voigt model of the viscoelastic medium. A dispersion relation is derived and the rate of the wave decay is computed. An asymptotic and explicit expression of the decay rate for different water depth is given,when the viscoelasticity is very large or very small. Comparing with the accurate numerical results,the accuracy is very satisfactory. It can be used as a reference for engineers.