【摘要】 本文假设均匀浅海的混响主要是海底混响,在海底散射为均匀散射和兰贝特散射两种情况下用简正波方法分别计算了无指向性和有指向性发射、接收时的远程平均混响强度,并作了比较。更多还原

【Abstract】 When the main source of shallow-water reverberation under isovelocity conditions is bottom backscattering, the approximate expressions of average reverberation intensity at long range are derived in terms of normal-mode theory and the ray-mode interrelationship. In the case the source and receiver are nondirectional, it is shown that the reverberation intensity is proportional to r-3 for Lambet’s scattering and proportional to r-5/2 for omnidirectional scattering. In the other case the source and receiver are directional, the reverberation intensity can also be calculated with normal-mode theory. Finally, the difference between the results in the two cases is discussed and a critical range, over which the difference can be neglected, is given.更多还原