正声速梯度浅海远程海面混响的平均强度

木文导出了具有随机起伏表面的正声速梯度浅海远程海面混响的平均强度的表达式.结果指出,远程海面混响的平均强度随距离的下降速度大于“一次方规律”下降的速度;当海面起伏所引起声传播的附加衰减可以忽略时,远程海面混响的平均强度随距离按“一次万规律”下降.文末,我们就一个具体例子作了数值计算.

AVERAGE INTENSITY OF LONG RANGE SURFACE REVERBERATIONS IN SHALLOW WATER WITH POSITIVE SOUND VELOCITY GRADIENT

In this paper, the average intensity of long range surface reverberations in shallow water with a positive sound volocity gradient and a random fluctuation surface is derived. The result shows that the decay speed for the average intensity of long range surface reverberations with increasing range is faster than cylindrical spreading: r-1. When that additional propagation attenuation due to random fluctuation surface may be omitted, the decay of average intensity of long range surface reverberation is proportional to r-1, where r is distance. Detailed calculation of the decay of the averaged reverberation intensity with range has been carried out for a concrete case, with the numerical results presented in Fig. 2 and Fig. 3.