【摘要】 <正> 一、引言 近年来很多的实验指出,正声速梯度浅海中声强的平均衰减规律与海面的不平整度,声波的频率,相对声速梯度的大小,发射深度与接收深度等因素有着密切的联系。本文的目的在于寻找这种联系的数学表式。我们采用文献所发展的平均法来求其平均声强。更多还原

【Abstract】 Assuming that shallow water with a positive sound velocity gradient has a rough surface, the change of surface height is a stationary stochastic process with Gaussian distribution. The normal-modes which can reach receiver are summed according to energy, and an expression for the averaged intensity is then obtained by averaging over the source and receiver depth witthin the turning-depth of pseudo-plane waves corresponding to these normal-modes. Theoretical results are in good agreement with experimental data. The structure of the sound field in the case of a quiet sea surface as a special case of rough surface.更多还原