准分层介质声场的近似算法

Approximation of Sound Field in Quasi-Layered Medium

给出了近似解算准分层介质声场的小参数展开法，该方法物理图象清晰、计算简便由于实际海洋环境条件中，介质特性的水平变化率常比其垂直变化率小好几个数量数级，因此可仅考虑按此方法取一至二阶修正，这时计算工作量将小于现有的其他方法在较单纯的环境变化情况下，甚至可获得近似的声场解析表达式文中还以一种变化海底海域为例。

A perturbation method using small parameter is given for the approximation of sound field in quasi-layered medium.Which has clear physical interpretation and easy in calculation.Since the order of horizontal rate of change in character of medium is usually much less than the order of its vertical rate of change for actual ocean environment,therefore by given method,only the first few terms are needed to take into consideration.Corresponding calculation will be less than other methods,even approximate analytic expression of sound field can be got in case of simple variation of environmental factors.Example is given in the paper for case of varying sea bottom with numerical results.